Journal
PROTEIN EXPRESSION AND PURIFICATION
Volume 30, Issue 2, Pages 194-202Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S1046-5928(03)00104-9
Keywords
Pleurotus sajor-caju; trehalose; trehalose phosphorylase; complementation of yeast Delta tpsl; Delta tps2 mutant
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Complementary DNA for a gene encoding trehalose phosphorylase (TP) that reversibly catalyzes trehalose synthesis and degradation from alpha-glucose-1-phosphate (alpha-Glc-1-P) and glucose was cloned from Pleurotus sajor-caju. The cDNA of P. sajor-caju TP (designated PsTP, GenBank Accession No. AF149777) encodes a polypeptide of 751 amino acids with a deduced molecular mass of 83.7 kDa. The PsTP gene is expressed in mycelia, pilei, and stipes of fruiting bodies. Trehalose phosphorylase PsTP was purified from PsTP-transformed Escherichia coli. The enzyme catalyzes both the phosphorolysis of trehalose to produce alpha-Glc-1-P and glucose, and the synthesis of trehalose. The apparent K-m values for trehalose and Pi in phosphorolytic reaction at pH 7.0 were 74.8 and 5.4mM, respectively. The PsTP gene complemented Saccharomyces cerevisiae Deltatps1, Deltatps2 double-mutant cells, allowing their growth on glucose medium. Furthermore, yeast transformed with PsTP produced 2-2.5-fold more trehalose than non-transformants or cells transformed with empty vector only. (C) 2003 Elsevier Science (USA). All rights reserved.
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