The Protein Journal

, Volume 32, Issue 7, pp 551–559 | Cite as

Cloning, Expression and Characterization of Sugarcane (Saccharum officinarum L.) Transketolase



Pentose phosphate pathway (PPP) composed of two functionally-connected phases, the oxidative and non-oxidative phase. Both phases catalysed by a series of enzymes. Transketolase is one of key enzymes of non-oxidative phase in which transfer two carbon units from fructose-6-phosphate to erythrose-4-phosphate and convert glyceraldehyde-3-phosphate to xylulose-5-phosphate. In plant, erythrose-4-phosphate enters the shikimate pathway which is produces many secondary metabolites such as aromatic amino acids, flavonoids, lignin. Although transketolase in plant system is important, study of this enzyme is still limited. Until to date, TKT genes had been isolated only from seven plants species, thus, the aim of present study to isolate, study the similarity and phylogeny of transketolase from sugarcane. Unlike bacteria, fungal and animal, PPP is complete in the cytosol and all enzymes are found cytosolic. However, in plant, the oxidative phase found localised in the cytosol but the sub localisation for non-oxidative phase might be restricted to plastid. Thus, this study was conducted to determine subcellular localization of sugarcane transketolase. The isolation of sugarcane TKT was done by reverse transcription polymerase chain reaction, followed by cloning into pJET1.2 vector and sequencing. This study has isolated 2,327 bp length of sugarcane TKT. The molecular phylogenetic tree analysis found that transketolase from sugarcane and Zea mays in one group. Classification analysis found that both plants showed closer relationship due to both plants in the same taxon i.e. family Poaceae. Target P 1.1 and Chloro P predicted that the compartmentation of sugarcane transketolase is localised in the chloroplast which is 85 amino acids are plant plastid target sequence. This led to conclusion that the PPP is incomplete in the cytosol of sugarcane. This study also found that the similarity sequence of sugarcane TKT closely related with the taxonomy plants.


Transketolase Pentose phosphate pathway Subcellular localisation Phylogenetic Sugarcane cDNA cloning Protein expression 



Pentose phosphate pathway




Reverse transcription polymerase chain reaction


Deoxyribonucleic acid


Polymerase chain reaction


Complementary deoxyribonucleic acid






Revolutions per minute


Sodium dodecyl sulphate–polyacrylamide gel electrophoresis



The above study was made possible through the generosity of many individuals. We would like to acknowledge to Universiti Putra Malaysia for the research grants, Research University Grant Scheme (RUGS6) for financial support.


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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Department of Biology, Faculty of ScienceUniversiti Putra MalaysiaSerdangMalaysia

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