Abstract:
:The cDNA sequence of the gene for xylose isomerase from the rumen fungus Orpinomyces was elucidated by rapid amplification of cDNA ends. The 1,314-nucleotide gene was cloned and expressed constitutively in Saccharomyces cerevisiae. The deduced polypeptide sequence encoded a protein of 437 amino acids which showed the highest similarity to the family II xylose isomerases. Further, characterization revealed that the recombinant enzyme was a homodimer with a subunit of molecular mass 49 kDa. Cell extract of the recombinant strain exhibited high specific xylose isomerase activity. The pH optimum of the enzyme was 7.5, while the low temperature optimum at 37 degrees C was the property that differed significantly from the majority of the reported thermophilic xylose isomerases. In addition to the xylose isomerase gene, the overexpression of the S. cerevisiae endogenous xylulokinase gene and the Pichia stipitis SUT1 gene for sugar transporter in the recombinant yeast facilitated the efficient production of ethanol from xylose.
journal_name
Appl Microbiol Biotechnoljournal_title
Applied microbiology and biotechnologyauthors
Madhavan A,Tamalampudi S,Ushida K,Kanai D,Katahira S,Srivastava A,Fukuda H,Bisaria VS,Kondo Adoi
10.1007/s00253-008-1794-6subject
Has Abstractpub_date
2009-04-01 00:00:00pages
1067-78issue
6eissn
0175-7598issn
1432-0614journal_volume
82pub_type
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