Linked Life Data

12482857

Source:http://linkedlifedata.com/resource/pubmed/id/12482857

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2003-2-10
pubmed:abstractText
At least three peptidases are involved in cleaving presequences from imported mitochondrial proteins. One of the peptidase, the inner membrane peptidase, has two catalytic subunits, Imp1p and Imp2p, which are structurally related but functionally distinct in the yeast Saccharomyces cerevisiae. Whereas both subunits are members of the type I signal peptidase family, they exhibit nonoverlapping substrate specificities. A clue to the substrate specificity mechanism has come from our discovery of the importance not only of the -1 and -3 residues in the signal peptides cleaved by Imp1p and Imp2p but also the +1 cargo residues attached to the signal peptides. We specifically find that Imp1p prefers substrates having a negatively charged residue (Asp or Glu) at the +1 position, whereas Imp2p prefers substrates having the Met residue at the +1 position. We further suggest that the conformation of the cargo is important for substrate recognition by Imp2p. A role for the cargo in presequence recognition distinguishes Imp1p and Imp2p from other type I signal peptidases.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
14
pubmed:volume
278
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4943-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Factors governing nonoverlapping substrate specificity by mitochondrial inner membrane peptidase.
pubmed:affiliation
Department of Microbiology and Immunology, School of Medicine, Vanderbilt University, Nashville, Tennessee 37232-2363, USA. wentian.luo@vanderbilt.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't