Abstract:
:The catabolism of methionine to methionol and methanethiol in Saccharomyces cerevisiae was studied using (13)C NMR spectroscopy, GC-MS, enzyme assays and a number of mutants. Methionine is first transaminated to alpha-keto-gamma-(methylthio)butyrate. Methionol is formed by a decarboxylation reaction, which yields methional, followed by reduction. The decarboxylation is effected specifically by Ydr380wp. Methanethiol is formed from both methionine and alpha-keto-gamma-(methylthio)butyrate by a demethiolase activity. In all except one strain examined, demethiolase was induced by the presence of methionine in the growth medium. This pathway results in the production of alpha-ketobutyrate, a carbon skeleton, which can be re-utilized. Hence, methionine catabolism is more complex and economical than the other amino acid catabolic pathways in yeast, which use the Ehrlich pathway and result solely in the formation of a fusel alcohol.
journal_name
FEMS Yeast Resjournal_title
FEMS yeast researchauthors
Perpète P,Duthoit O,De Maeyer S,Imray L,Lawton AI,Stavropoulos KE,Gitonga VW,Hewlins MJ,Dickinson JRdoi
10.1111/j.1567-1356.2005.00005.xkeywords:
subject
Has Abstractpub_date
2006-01-01 00:00:00pages
48-56issue
1eissn
1567-1356issn
1567-1364pii
FYR005journal_volume
6pub_type
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