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B6db references: 12393204

type Journal Article
authors Fukamachi, H.; Nakano, Y.; Yoshimura, M.; Koga, T.
title Cloning and characterization of the L-cysteine desulfhydrase gene of Fusobacterium nucleatum
journal FEMS Microbiol Lett
Activity cysteine.desulfhydrase
Family cysteine.desulfhydrase.b
sel selected
ui 12393204
year (2002)
volume 215
number 1
pages 75-80
 
abstract Hydrogen sulfide and methyl mercaptan are the two major compounds associated with oral malodor. These compounds are highly toxic, and are thought to play an important role in periodontal disease. Fusobacterium nucleatum, an oral bacterium, produces large amounts of hydrogen sulfide from L-cysteine by the enzymatic action of L-cysteine desulfhydrase. We cloned and sequenced the cdl gene encoding L-cysteine desulfhydrase from F. nucleatum ATCC 10953, and revealed that the structural cdl gene consists of 921 bp and encodes a 33.4-kDa protein. The cloned gene was inserted into an expression vector, pDEST17, and expressed in Escherichia coli as a fused protein. The purified enzyme was tested for substrate specificity using various SH-containing compounds. Only L-cysteine served as a substrate for L-cysteine desulfhydrase to produce hydrogen sulfide.
last changed 2010/06/18 16:51

B6db references