Linked Life Data

8042900

Source:http://linkedlifedata.com/resource/pubmed/id/8042900

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1994-8-25
pubmed:databankReference
pubmed:abstractText
DNA sequence analysis of the structural urease genes from Staphylococcus xylosus revealed that three enzyme subunits are encoded in the order of 11,000, 15,400 and 61,000 (mol. mass), which correspond to the single polypeptide chain of jack bean urease (90,800). Comparing the deduced amino acid sequence of S. xylosus urease with the amino acid sequence of jack bean urease an overall portion of 56% identical residues was found. For S. xylosus urease a subunit structure of (alpha beta gamma)4 was proposed, based on the comparison of the deduced amino acid content of the enzyme subunits with the total amino acid content of the purified enzyme. The staphylococcal enzyme contained no cysteine, as deduced from DNA sequence and confirmed by the determination of the total amino acid content in the purified enzyme. Instead of cysteine, known to be catalytically essential in the plant enzyme, and conserved among all bacterial ureases analyzed so far, threonine was found in S. xylosus. This amino acid-exchange was located within a highly conserved domain of 17 amino acids, supposed to be part of the active site. Sequence analysis of the respective region of Staphylococcus saprophyticus urease showed that it also contains threonine instead of cysteine. In contrast to jack bean urease S. xylosus urease was not affected by the SH-group inhibitor dipyridyl disulfide but was completely inhibited by the serine protease inhibitor phenylmethanesulfonyl fluoride. The presented results indicate that in these staphylococcal strains urea hydrolysis might function in a manner similar to the peptide bond cleavage by chymotrypsin.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0302-8933
pubmed:author
pubmed:issnType
Print
pubmed:volume
161
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
384-92
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Threonine is present instead of cysteine at the active site of urease from Staphylococcus xylosus.
pubmed:affiliation
Lehrstuhl für Mikrobiologie, Universität des Saarlandes, Saarbrücken, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't