Abstract
Key message
The present study first identified the involvement of OcUAXS2 and OcUXS1–3 in anticancer polysaccharides biosynthesis in O. caudatum.
Abstract
UDP-xylose synthase (UXS) and UDP-d-apiose/UDP-d-xylose synthase (UAXS), both capable of converting UDP-d-glucuronic acid to UDP-d-xylose, are believed to transfer xylosyl residue to anticancer polysaccharides biosynthesis in Ornithogalum caudatum Ait. However, the cDNA isolation and functional characterization of genes encoding the two enzymes from O. caudatum has never been documented. Previously, the transcriptome sequencing of O. caudatum was performed in our laboratory. In this study, a total of six and two unigenes encoding UXS and UAXS were first retrieved based on RNA-Seq data. The eight putative genes were then successfully isolated from transcriptome of O. caudatum by reverse transcription polymerase chain reaction (RT-PCR). Phylogenetic analysis revealed the six putative UXS isoforms can be classified into three types, one soluble and two distinct putative membrane-bound. Moreover, the two UAXS isoenzymes were predicted to be soluble forms. Subsequently, these candidate cDNAs were characterized to be bona fide genes by functional expression in Escherichia coli individually. Although UXS and UAXS catalyzed the same reaction, their biochemical properties varied significantly. It is worth noting that a ratio switch of UDP-d-xylose/UDP-d-apiose for UAXS was established, which is assumed to be helpful for its biotechnological application. Furthermore, a series of mutants were generated to test the function of NAD+ binding motif GxxGxxG. Most importantly, the present study determined the involvement of OcUAXS2 and OcUXS1–3 in xylose-containing polysaccharides biosynthesis in O. caudatum. These data provide a comprehensive knowledge for UXS and UAXS families in plants.
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Abbreviations
- IPTG:
-
Isopropyl β-d-thiogalactoside
- OCAP:
-
Ornithogalum caudatun Ait polysaccharide
- ORF:
-
Open reading frame
- RT-PCR:
-
Reverse transcription polymerase chain reaction
- RT-qPCR:
-
Real-time quantitative PCR
- SDR:
-
Short-chain dehydrogenase/reductase
- UAXS:
-
UDP-d-apiose/UDP-d-xylose synthase
- UDP-d-Api:
-
UDP-d-apiose
- UDP-d-Gal:
-
UDP-d-galactose
- UDP-d-GalA:
-
UDP-d-galacturonic acid
- UDP-d-Glc:
-
UDP-d-glucose
- UDP-d-GlcA:
-
UDP-d-glucuronic acid
- UDP-d-Xyl:
-
UDP-d-xylose
- UXS:
-
UDP-xylose synthase
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Acknowledgments
The authors thank Prof. Cheng KD and Wang W for providing the cultivated bulbs of Ornithogalum caudatum. This work was supported by Independent Subject of Key Project of State Key Laboratory of Bioactive Substance and Function of Natural Medicines (GTZA201404) and the Fundamental Research Funds for the Central Universities of Chinese Academy of Medical Sciences and Peking Union Medical College (2016ZX350001).
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Communicated by P. Puigdomenech.
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Yin, S., Kong, JQ. Transcriptome-guided gene isolation and functional characterization of UDP-xylose synthase and UDP-d-apiose/UDP-d-xylose synthase families from Ornithogalum caudatum Ait. Plant Cell Rep 35, 2403–2421 (2016). https://doi.org/10.1007/s00299-016-2044-5
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DOI: https://doi.org/10.1007/s00299-016-2044-5