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Cloning and disruption of the LEU2 gene of Kluyveromyces marxianus CBS 6556
Author(s) -
Bergkamp Ronald J. M.,
Geerse Ruud H.,
Verbakel John M. A.,
Musters Wouter,
Planta Rudi J.
Publication year - 1991
Publication title -
yeast
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.923
H-Index - 102
eISSN - 1097-0061
pISSN - 0749-503X
DOI - 10.1002/yea.320070908
Subject(s) - biology , kluyveromyces marxianus , gene , open reading frame , genetics , coding region , microbiology and biotechnology , nucleic acid sequence , saccharomyces cerevisiae , peptide sequence
The LEU2 gene, coding for β‐isopropylmalate dehydrogenase, of the yeast Kluyveromyces marxianus was isolated and sequenced. An open reading frame, coding for a protein with a molecular weight of 38kDa was found. Comparison of the deduced amino acid sequence of the LEU2 gene with the corresponding enzymes of three other yeasts and two thermophilic bacteria, revealed extensive sequence similarities. The cloned gene could complement a leuB mutation of Escherichia coli and a leu2 mutation of Saccharomyces cerevisiae . Using orthogonal field alternation gel electrophoresis, the genomic copy of the gene was found to be located at chromosome VI or VII. Analysis of the 5′‐untranslated region indicated the presence of a putative binding site for the LEU3 protein, which is involved in the leucine‐specific regulation of transcription. We show that the cloned gene can be used for the construction of a non‐reverting K. marxianus leu2 mutant.