, Volume 47, Issue 6, pp 792–804 | Cite as

Cloning and molecular identification of triosephosphate isomerase gene from Apis cerana cerana and its role in response to various stresses

  • Yuli Zhou
  • Fang Wang
  • Feng Liu
  • Chen Wang
  • Yan Yan
  • Xingqi Guo
  • Baohua Xu
Original article


Apis cerana cerana triosephosphate isomerase (AccTPI), a key regulatory enzyme in glycolysis and gluconeogenesis pathway, catalyzes the interconversion of glyceraldehyde 3-phosphate to dihydroxyacetone phosphate. However, its role in A. cerana cerana has not been completely clarified. In this study, a TPI gene was cloned from A. cerana cerana and named AccTPI. The open reading frame (ORF) of AccTPI is 744 bp, which encodes 247 amino acids with a predicted molecular weight and an isoelectric point of 26.8 kDa and 8.42, respectively. The expression of AccTPI was up-regulated by some abiotic stresses, while it was down-regulated by HgCl2, ultraviolet light (UV), and vitamin C (VC) treatment. Finally, a disc diffusion assay revealed that recombinant AccTPI proteins can protect cells from oxidative stresses. Taken together, all of the results indicate that AccTPI may play an important role in the metabolism, in antioxidant defense, and in many biological functions in the growth and development of A. cerana cerana.


triosephosphate isomerase Apis cerana cerana abiotic stress metabolism 

1 Introduction

As a pollinator, Apis cerana cerana is significant in keeping the balance between regional ecologies and agricultural economics (Weinstock et al. 2006). A. cerana cerana has been raised in Asian countries for thousands of years and has brought considerable economic benefits to the apicultural industry (Park et al. 2015). The honeybee is an important model organism for neuroethological studies; it exhibits high behavioral plasticity and a remarkable ability to learn (Zhang et al. 2015). Compared with Apis mellifera, A. cerana cerana has actually been shown to learn better in a controlled laboratory setting (Qin et al. 2012). Recent colony losses of A. cerana cerana have thus raised concern, and possible explanations for bee decline include nutritional deficiencies and exposures to pesticides and pathogens. Thus, we chose A. cerana cerana as the experimental organism for this study. A. cerana cerana has unique characteristics including heat hardiness and disease resistance (Li et al. 2008). However, the survival of A. cerana cerana is under increasing threat due to various stressors including the indiscriminate use of pesticides and global warming. Moreover, organisms are exposed to a variety of unfavorable environmental stressors which are believed to induce the formation of reactive oxygen species (ROS) (Kottuparambila et al. 2012).

ROS, which include superoxide anions, hydrogen peroxide, and hydroxyl radicals, can be induced by external or internal factors, such as pro-oxidants, heavy metals, and pesticides (Imlay 2003). Generally, there is a balance between the generation of ROS and antioxidant processes, but exogenous stressors can break this balance (Brennan et al. 2008). High ROS concentrations contribute to degenerative diseases and aging through the oxidation of nucleic acids, proteins, and lipid membranes (Valko et al. 2006). To avoid the damage caused by ROS, insects have evolved an intricate mechanism of enzymatic antioxidant systems (Felton and Summers 1995). Reduced ROS generation, increased antioxidant protection or a combination of both increases the lifespan of social insects (Keller and Jemielity 2006). Aerobic organisms have also developed sophisticated antioxidant mechanisms and evolved various enzymatic antioxidant systems to avoid oxidative damage (Jia et al. 2014).

Metabolic regulation is very important for cellular tolerance to oxidants, providing the reducing power for the antioxidant machinery (Chu et al. 2008). Previous studies have demonstrated that triosephosphate isomerase (TPI) catalyzes the isomerization of glyceraldehyde-3-phosphate and dihydroxyacetone phosphate and plays an essential role in glycolysis, gluconeogenesis, and fatty acid synthesis (Zinsser et al. 2013). TPI plays an important function in generating energy and contributing to metabolism. Without TPI, there would be no net production of ATP to promote aerobic metabolism. Furthermore, the deficiency of TPI can result in metabolic diseases (Zhou et al. 2015).

Aerobic metabolism depends on the activities of glycosomal TPI and a mitochondrial glycerophosphate oxidase in Trypanosoma brucei (Helfert et al. 2001). During the life cycle of Clonorchis sinensis, adult worms can take in external glucose for their energy supply through the glycolysis pathway (Zhou et al. 2015). TPI deficiency in Drosophila melanogaster exhibits phenotypes such as susceptibility to infection, neurodegeneration, and reduced life span (Hrizo and Palladino 2010). The catalytic activity of TPI is unrestricted, and it is crucial to behavior and longevity (Roland et al. 2013). Yeast cells expressing a TPI variant are more resistant against oxidative stress and so TPI cannot tolerate all oxidative stress (Ralser et al. 2006). Furthermore, several studies demonstrate variations of TPI activity in relation to the levels of antioxidants in lymphocytes (Ralser et al. 2006). In bees, Wang et al. (2013) found that mixed-function oxidative enzymes are the most important enzymes in acaricide detoxification and resistance. Hence, we speculated that the TPI gene in bees might be associated with ROS, so we investigated the TPI antioxidant system in A. cerana cerana and its role in ROS defense mechanisms.

As the biochemical characterization of AccTPI was still unclear, this is the first study describing the cloning, overexpression, and characterization of a recombinant TPI from A. cerana cerana. The function of TPI in A. cerana cerana was studied to understand its role in cellular defense systems and metabolism. The RNA and protein expression levels of AccTPI were calculated. Furthermore, a disc diffusion assay was performed to evaluate the capacity of AccTPI to defend against oxidative stress.

2 Materials and methods

2.1 Animals and various treatments

A. cerana cerana were obtained from the experimental apiary at Shandong Agricultural University, Taian, China. Based on age, eye color, and shape, the worker honeybees were generally classified as larvae, pupae, and adults (Elias-Neto et al. 2010). The first (L1), third (L3), fifth (L5), and seventh (L7) day larvae; white-eyed (Pw), pink-eyed (Pp), brown-eyed (Pb), and dark-eyed (Pd) pupae; and newly emerged adults (A1, 1 day post-emergence), 1 week-old bees (A7, usually 7–10 days post-emergence), which are likely nurses, and 2 week-old bees (A15, older than 15 days post-emergence), which can be foragers, were gathered during the spring season from two hives maintained in the experimental apiary. For tissue-specific analyses of AccTPI expression levels, the antenna (AN), abdomen (AB), head (HE), hemolymph (HA), epidermis (EP), venom gland (VG), muscle (MU), thoracic (TH), and midgut (MI) of adult workers were used. These were dissected on ice, washed twice with PBS, frozen in liquid nitrogen, and stored at −70 °C.

Fifteen-day-old adult bees were collected randomly and reared under 34 °C and 60 % relative humidity and fed a diet of water and a combination of pollen and sucrose (Alaux et al. 2010). The worker honeybees were randomly separated into eight groups, and each group contained 30 individuals. Groups 1, 2, and 3 were exposed to 4, 14, and 44 °C, respectively. Group 4 was treated with ultraviolet light (UV) (254 nm, 30 mJ/cm2). Groups 5 and 6 were exposed to two pesticides (2.0 mg/L of paraquat and pyridaben was added to the basic adult diet, respectively). The control group was fed on a normal diet containing water, 70 % powdered sugar, and 30 % honey from the source colonies. Group 7 was fed HgCl2 (3 mg/mL). Group 8 was subjected to vitamin C (20,000 mg/kg). The honeybees were flash-frozen in liquid nitrogen at a suitable time and stored at −70 °C until use.

2.2 RNA extraction, cDNA synthesis, and DNA preparation

Total RNA was extracted from adult bees with the TRIzol reagent (Invitrogen, Carlsbad, CA, USA), and the RNA was treated with RNase-free DNase I (Promega, Madison, WI, USA). Then, the cDNA was synthesized using a reverse transcription system (TransGen Biotech, Beijing, China). The genomic DNA was isolated from the honeybees with the EasyPure Genomic DNA Extraction Kit (TransGen Biotech, Beijing, China).

2.3 Primers and PCR procedure

The primer sequences and PCR procedure are listed in Tables I and II, respectively.
Table I

The primers in this study.


Primer sequence (5′–3′)




cDNA sequence primer, forward



cDNA sequence primer, reverse



5′RACE reverse primer, outer



5′RACE reverse primer, inner



3′RACE forward primer, outer



3′RACE forward primer, inner



Abridged anchor primer



Abridged universal amplification primer



3′RACE universal primer, outer



3′RACE universal primer, inner



Real-time PCR primer, forward



Real-time PCR primer, reverse



Standard control primer, forward



Standard control primer, reverse



Genomic sequence primer, forward



Genomic sequence primer, reverse



Protein expression primer, forward



Protein expression primer, reverse

Table II

PCR amplification conditions.

Primer pair

Amplification conditions


10 min at 94 °C, 40 s at 94 °C, 40 s at 54 °C, 60 s at 72 °C for 35 cycles, 10 min at 72 °C


10 min at 94 °C, 40 s at 94 °C, 40 s at 54 °C, 60 s at 72 °C for 35 cycles, 10 min at 72 °C


10 min at 94 °C, 40 s at 94 °C, 40 s at 55 °C, 60 s at 72 °C for 35 cycles, 10 min at 72 °C


10 min at 94 °C, 40 s at 94 °C, 40 s at 57 °C, 60 s at 72 °C for 35 cycles, 10 min at 72 °C


10 min at 94 °C, 40 s at 94 °C, 40 s at 55 °C, 60 s at 72 °C for 35 cycles, 10 min at 72 °C


10 min at 94 °C, 40 s at 94 °C, 40 s at 55 °C, 120 s at 72 °C for 35 cycles, 10 min at 72 °C


10 min at 94 °C, 40 s at 94 °C, 40 s at 58 °C, 60 s at 72 °C for 35 cycles, 10 min at 72 °C

2.4 Bioinformatics analysis and phylogenetic tree construction

The conserved nucleotide sequences of AccTPI were analyzed using DNAman software 6.0.3 and the National Center for Biotechnology Information (NCBI) bioinformatics tools ( The predicted amino acid sequence was aligned with the homologous sequences of various insects, which were acquired from the NCBI Genbank database. The molecular weight and theoretical isoelectric point were predicted using the online tool ExPASy ( A phylogenetic tree was constructed using the Molecular Evolutionary Genetic Analysis (MEGA version 4.0) software.

2.5 Quantitative real-time PCR

To evaluate the expression profile of AccTPI in different developmental stage tissues and abiotic stresses, RT-qPCR was performed using the SYBR® PrimeScript RT-PCR Kit (TaKaRa, Dalian, China) with two specific primers (DLF and DLR). The reaction volume and the reaction requirements were as those of Yao et al. 2013. The PCR reactions were performed using a CFX96 Real-Time System (Bio-Rad), and the β-actin gene (GenBank accession no. HM640276; A. cerana cerana actin-related protein 1) was used as an internal control. We also obtained experimental data in which we tested and compared additional reference genes (β-actin, ribosomal protein 49, elongation factor 1-alpha, tbp-association factor); see Supplemental Fig. 3. All of the samples were analyzed in triplicate. The relative gene expression levels of AccTPI were calculated using the 2−ΔΔCt comparative CT method (Livak and Schmittgen 2001). The analysis was performed with Duncan’s multiple range test using Statistical Analysis System (SAS) software version 9.1.

2.6 Protein expression and purification of recombinant AccTPI

To obtain the AccTPI protein, the recombinant plasmid pET-30a (+)-AccTPI was transfected into Escherichia coli BL21 (DE3). The bacteria were incubated in Luria-Bertani (LB) broth with kanamycin at 37 °C until the cell density at 600 nm reached 0.4–0.6. Then, the AccTPI expression was induced with 1.0 mM isopropyl-1-thio-β-d-galactopyranoside (IPTG) at 18 °C overnight. The protein was purified on a HisTrap FF column (GE Healthcare, Uppsala, Sweden). The expression of the target protein was analyzed by 12 % sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE).

2.7 Western blotting analysis

The white mice for the generation of antibodies came from China Biologic Products, Inc. (Shandong). The protocol numbers of certificates that they produced and used for animal research were SCXK (LU) 2013 0006 and SYXK (LU) 2013 0011, respectively. The Tissue Protein Extraction Kit (CoWin Bioscience Co., Beijing, China) was used to extract the total A. cerana cerana protein, and it was quantified with the BCA Protein Assay Kit (Nanjing Jiancheng Bioengineering Institute, Nanjing, China). Western blotting was performed according to the procedure of Chen et al. (2014). The following treatments were performed to analyze the protein expression levels: (1) 4 °C, (2) H2O2, (3) methomyl, (4) pyridaben, (5) UV, and (6) vitamin C (VC).

2.8 Disc diffusion assay

Disc diffusion assays were performed according to Chen et al. (2014) for the evaluation of the activity of recombinant AccTPI. E. coli BL21 (DE3) cells were incubated in LB liquid medium with kanamycin at 37 °C until the cell density reached 0.4–0.6 OD600, then IPTG was introduced to the LB broth at a final concentration of 1 mM. They were induced using IPTG and incubated for 8 h at 18 °C with shaking at 180 rpm. Approximately 5 × 108 bacterial cells overexpressing AccTPI were seeded onto LB-kanamycin agar plates and incubated at 37 °C for 1 h. Filter discs (8-mm diameter) soaked with different concentrations of t-butylhydroperoxide (0, 15, 20, 30, or 40 mM) and cumene hydroperoxide (0, 30, 50, 80, or 100 mM) were placed on the surface of the top agar. Eventually, the cells were incubated at 37 °C for 24 h before the inhibition zones around the paper discs were measured as described by Burmeister et al. (2008). E. coli BL21 cells transformed with empty pET-30a(+) were used as the control. The greater of the bacteriostatic circle bacteria is more sensitive, rather than vise versa.

3 Results

3.1 Identification of the full-length cDNA and sequence analysis

The full-length cDNA of the AccTPI gene (GenBank accession no. KP994676) was cloned. It comprised 1894 bp containing a 744-bp open reading frame (ORF), a 158-bp 5′-untranslated region (UTR), and a 992-bp 3′-UTR. The ORF encodes a polypeptide of 247 amino acids with a predicted molecular weight of 26.8 kDa and theoretical isoelectric point of 8.42.

Multiple sequence alignments of several TPI proteins indicates that the putative AccTPI shares high homology with A. mellifera AmTPI (NP 001090623.1), Megachile rotundata MrTPI (XP 003700534.1), Harpegnathos saltator HsTPI (XP 011146748.1), and Acromyrmex echinatior AeTPI (EGI64718.1), respectively (Figure 1a). As shown in Figure 1, we found one TPI locus and several protein kinase C phosphorylation sites in the ORF. A phylogenetic tree was built to illustrate the evolutionary relationship of TPI among insects. The exons and introns of AccTPI were aligned with AmTPI (NM 001097154.2), MrTPI (XM 003700486.1), and HsTPI (XM 011148446.1). This analysis showed that AccTPI, AmTPI, MrTPI, and HsTPI contain two introns and three exons (Supplemental Fig. 1).
Figure 1.

Multiple alignment analysis of AccTPI and a phylogenetic tree of the TPI amino acid sequences of several species. a Alignment of the deduced AccTPI protein sequence with other known species of TPI. The amino acid sequences of AmTPI, MrTPI, HsTPI, and AeTPI were used in the analysis. The TPI locus is marked by a horizontal line. The protein kinase C phosphorylation sites are marked by a black triangle. b Phylogenetic tree analysis of TPI from different species. The amino acid sequences of TPI were all obtained from NCBI.

3.2 Developmental and tissue-specific expression patterns of AccTPI

To investigate the expression patterns at different developmental stages and specific tissues, RT-qPCR assays were performed. As shown in Figure 2a, the expression levels peaked in the forager stage. The mRNA expression levels of AccTPI are higher in the L3 larval stages. Additionally, the expression levels in different AccTPI tissues were higher in the abdomen and thorax (Figure 2b).
Figure 2.

Expression profile of AccTPI in different developmental stages and tissues. a The expression profile of AccTPI was examined by RT-qPCR in different developmental stages including larvae, pupae, newly emerged adult workers, nurses, and foragers. b The expression profile of AccTPI was studied by RT-qPCR in various tissues. The data are the mean ± SEM of three independent experiments. The letters above the columns indicate significant differences (P < 0.01) according to Duncan’s multiple range test.

3.3 Expression patterns of AccTPI under abiotic stresses

To verify whether abiotic stresses could affect AccTPI expression, a 15-day post-emergence adult stage was chosen and total RNA was extracted. The expression of AccTPI was induced by 4 °C treatment and reached the highest level at 2 h after exposure. Moreover, the expression of AccTPI was inhibited by 14 °C treatment and the expression level subsequently increased after 44 °C treatment (Figure 3a–c). The expression of AccTPI was up-regulated in response to the paraquat and pyridaben treatments (Figure 3d, e). In contrast, the expression of AccTPI was down-regulated after UV, HgCl2, and VC treatments (Figure 3f–h).
Figure 3.

Expression profile of AccTPI under different abiotic stresses. The expression of AccTPI was analyzed by RT-qPCR using total RNA extracted from A. cerana cerana, which was treated with different stressors. For the stress treatments, 15-day-old adult bees were subjected to treatments with a 4 °C, b 14 °C, c 44 °C, d pyridaben, e paraquat, f VC, g UV, and h HgCl2. CK is the abbreviation for control check. The letters above the bars indicate significant differences (P < 0.01) according to the SAS software version 9.1. The data are the mean ± SEM of three independent experiments. The letters above the columns indicate significant differences (P < 0.01) according to Duncan’s multiple range test.

3.4 Expression and purification of recombinant AccTPI protein

To further characterize the properties of AccTPI via protein levels, AccTPI was transformed into E. coli BL21 (DE3) with the pET-30a(+) vector. The E. coli cells were obtained from the LB solution after induction with IPTG overnight. SDS-PAGE analysis indicated that a recombinant protein was expressed and had a molecular mass of approximately 33 kDa (Supplemental Fig. 2, lane 2). It contained the AccTPI protein (26.8 kDa) and the His tag (7 kDa). The recombinant protein was purified with HisTrap FF columns. The result is shown in Supplemental Fig. 2, lane 7.

3.5 Western blot analysis

A western blot analysis was performed to further detect the expression profiles of AccTPI under various adverse stresses. The results displayed that the expression of AccTPI protein levels were consistent with the transcriptional expression levels. The expression levels of AccTPI were up-regulated by 4 °C, H2O2, and methomyl and pyridaben treatments. Furthermore, the expression levels of AccTPI were down-regulated by UV and VC treatments (Figure 4).
Figure 4.

Western blot analysis of AccTPI. Western blot conditions include 15-day-old adult bees that were subjected to treatments with a 4 °C, b pyridaben, c UV, d methomyl, e VC and f H2O2. All lanes were loaded with an equivalent amount of extracted protein for each group.

3.6 Disc diffusion assay under various stresses

To provide direct evidence that AccTPI is responsible for antioxidant defenses, a disc diffusion assay was performed according to Zhang et al. (2013). After overnight exposure to various stressors, the halo diameters of the death zones were significantly different for the various treatment concentrations. Compared with plates containing the control bacteria, the inhibition zones around the stressor-soaked filters were smaller in diameter containing E. coli overexpressing AccTPI (Figure 5).
Figure 5.

Disc diffusion assays for AccTPI. Filter discs soaked with different concentrations of a, c t-butylhydroperoxide and b, d cumene hydroperoxide were placed on agar plates. The picture on the left corresponds with the numbers on the right. The data are the mean ± SEM of three independent experiments. Statistical analysis was performed using Statistical Product and Service Solutions (SPSS) software version 19.0. Statistical significance was determined by unpaired Student’s t test; *P < 0.05, **P < 0.01.

4 Discussion

Sequence alignment and the phylogenetic tree analysis showed that AccTPI has a high degree of homology with several representative TPI amino acid sequences (Figure 1). Taken together, these results indicate that the gene we isolated is a bona fide AccTPI.

To better understand its physiology, AccTPI expression at different development stages and in various tissues was analyzed. The expression of AccTPI reached a maximum in the 15-day post-emergence workers, which likely are foragers (Figure 2a). TPI, a key regulatory enzyme of glycolysis and gluconeogenesis, plays an essential role in metabolism and development of most organisms (Zhou et al. 2015). These results revealed that AccTPI might be essential for the growth and development of bees. Additionally, the abdomen and thorax have higher AccTPI expression levels compared with other tissues (Figure 2b). Therefore, it is reasonable to deduce that AccTPI may be involved in differentiation or development relating to the mechanism of maturation, especially in the case of oxidation resistance. Considering all of these results, we propose that AccTPI may be involved in organismal development and growth.

Previous studies have indicated that A. cerana cerana are stressed due to environmental changes and ROS (Yan et al. 2012). As the expression of AccTPI in A. cerana cerana due to exposure to oxidative stress has not yet been systematically reported, we investigated in this study the expression levels of AccTPI in response to various abiotic stresses. The results demonstrate that AccTPI may play an important role in protecting A. cerana cerana from oxidative stresses.

Temperature is an abiotic environmental factor that causes physiological changes in organisms and affects herbivorous insects (An and Choi 2010). In general, heat shock stress can result in polyamine oxidation to generate H2O2, and ROS act as key mediators of cold-induced apoptosis (Rauen et al. 1999). In the present study, the expression levels of AccTPI under 4 and 44 °C conditions were up-regulated following treatment. Western blot analysis of AccTPI under 4 °C (Figure 4a) treatments confirmed the result, which demonstrates that AccTPI may play a vital role in response to extreme temperature, low temperature in particular. These results suggest that AccTPI may function by removing intracellular superoxide anions generated under high- or low-temperature conditions to protect honeybees from ROS damage. All of these results indicated that AccTPI may be associated with the prevention of the oxidative damage.

Oxidative stress can be induced by insecticides, temperature, and UV radiation (Kottuparambila et al. 2012). The role of pesticides in honeybee colony losses, with their sub-lethal and synergistic effects, has recently regained consideration (Boncristiani et al. 2012). TPI also plays an important role in response to adverse environmental conditions (Hewitson et al. 2014). TPI is highly up-regulated under stress conditions in mammalian cells (Yamaji et al. 2004). In this study, paraquat and pyridaben treatments up-regulated TPI expression levels in A. cerana cerana workers. The expression of AccTPI was up-regulated under some pesticide treatments. All of these results demonstrate that AccTPI expression is induced by abiotic stress and that AccTPI may play a crucial role in survival under adverse environmental conditions.

There is much evidence that UV is one of the most ubiquitous environmental hazards for most animals which can cause oxidative stress and in turn lead to protein damage (Schauen et al. 2007). Many heavy metals can induce the formation of endogenous ROS (Liu et al. 2009a). HgCl2 treatment suppresses the expression of Acctpx-3 (Yao et al. 2013). When honeybees were treated with UV and HgCl2, expression levels of AccTPI were significantly down-regulated. These results indicated that AccTPI may play various roles in dealing with various adverse conditions. The mRNA expression of AccTPI is specifically induced by certain stresses and repressed by others, and these results indicate that TPI is a mediator of the stressors. With an increase in the treatment concentration or an extension of the treatment time, the antioxidant system may temporarily be ineffective due to decreased expression. All of these results suggest that AccTPI is involved in resisting oxidative stress of A. cerana cerana restrictedly.

Western blot results for AccTPI under H2O2 and VC treatments verified that the expression is up-regulated and down-regulated depending on the stressor. H2O2-induced ROS increase results in cell death caused by oxidative stress (Casini et al. 1986). H2O2-induced ROS increase results in cell death caused by oxidative stress (Goldshmit et al. 2001). Vitamin C, a well-known antioxidant, induces the decomposition of lipid hydroperoxides to endogenous genotoxins and results in DNA oxidative damage (Lee et al. 2001). The expression levels of AccTPI in VC treatments were significantly down-regulated. A possible explanation for this was that with the increase of stress, other stress-related genes might play important roles in cellular stress responses and the role of AccTPI might be weakened. The expression levels of the AccTPI gene in A. cerana cerana were varied in response to the oxidative stresses. Thus, AccTPI may have a significant influence on the response to environmental stresses.

To understand the role of honeybee TPI in defending against oxidative stresses, disc diffusion assays (Figure 5) were used to detect the level of protection of AccTPI in E. coli cells from oxidative stressors (cumene hydroperoxide and t-butylhydroperoxide). The model external pro-oxidants cumene hydroperoxide and t-butylhydroperoxide were used because they are more stable than H2O2 under the applied incubation conditions (Zhang et al. 2013). There were variations in the diameters of the death zones between the AccTPI-overexpressing bacteria and the control bacteria. Hence, we can conclude that AccTPI can significantly contribute to cellular resistance under oxidative stresses and that the AccTPI gene has antioxygenic properties. The purified recombinant AccTPI protein showed a capacity to protect DNA from oxidative damage. Taken together, our data provide very useful information for further understanding the mechanisms responding to environmental pressures in A. cerana cerana.

In conclusion, all of the results indicate that AccTPI may play an important role in the metabolism and antioxidant defense of honeybees. The unique functional characteristics, expression patterns, and potential physiological roles of AccTPI that were demonstrated in this study offer the basic knowledge for further studies. It is an eternal theme for the survival of living organisms to protection against oxidative stress.



This work was financially supported by the earmarked fund for the China Agriculture Research System (No. CARS-45), the National Natural Science Foundation of China (No. 31172275), and the Shandong Province Agricultural Fine Varieties Breeding Projects (2014–2016).

Supplementary material

13592_2016_436_MOESM1_ESM.pdf (319 kb)
ESM 1 (PDF 318 kb)


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Copyright information

© INRA, DIB and Springer-Verlag France 2016

Authors and Affiliations

  1. 1.State Key Laboratory of Crop Biology, College of Life SciencesShandong Agricultural UniversityTaianPeople’s Republic of China
  2. 2.College of Animal Science and TechnologyShandong Agricultural UniversityTaianPeople’s Republic of China

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