Linked Life Data

831771

Source:http://linkedlifedata.com/resource/pubmed/id/831771

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1977-3-31
pubmed:abstractText
The distribution of bacterial L-methionine gamma-lyase (L-methionine methanethiollyase (deaminating) (EC 4.4.1.11) was investigated, and Pseudomonas ovalis (IFO 3738) was found to have the highest activity of enzyme, which was inducibly formed by addition of L-methionine to the medium. L-Methionine gamma-lyase, purified to homogeneity from Ps. ovalis, has a molecular weight of about 173 000 and consists of nonidentical subunits (mol wt: 40 000 and 48 000). The enzyme exhibits absorption maxima at 278 and 420 nm, and a shoulder around 330 nm, which are independent of the pH (6.0 to 10.0), and contains 4 mol of pyridoxal 5'-phosphate per mol of the enzyme. The formyl group of pyridoxal 5'-phosphate is bound in an aldimine linkage to the epsilon-amino group of lysine residues of the protein. The holoenzyme is resolved to the apoenzyme by incubation with hydroxylamine, and reconstituted by addition of pyridoxal 5'-phosphate. The enzyme activity is significantly affected by both carbonyl and sulfhydryl reagents. L-Methionine gamma-lyase catalyzes alpha,gamma- and alpha,beta-elimination reactions of, in addition to L-methionine, several derivatives of L-methionine and L-cysteine, e.g., L-ethionine, DL-methionine sulfone, L-homocysteine, and S-methyl-L-cysteine. The enzyme catalyzes also gamma-replacement reactions of the thiomethyl group of methionine with various alkanethiols (C2-C7), arylthio alcohols (benzenethiol and beta-naphthalenethiol) and the derivatives of ethanethiol (2-mercaptoethanol and cysteamine) to yield the corresponding S-substituted homocysteine. The thiomethyl group of S-methyl-L-cysteine also is replaced by ethanethiol to form S-ethyl-L-cysteine.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
11
pubmed:volume
16
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
100-6
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1977
pubmed:articleTitle
Properties of L-methionine gamma-lyase from Pseudomonas ovalis.
pubmed:publicationType
Journal Article