Linked Life Data

18088104

Source:http://linkedlifedata.com/resource/pubmed/id/18088104

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2008-1-8
pubmed:databankReference
pubmed:abstractText
Recently, we have shown (Goch, G., Vdovenko, S., Koz?owska, H., and Bierzy?ski, A. (2005) FEBS J. 272, 2557-2565) that the chemical modification of Cys 85 residue of S100A1 protein by disulfide bond formation with small thiols such as glutathione, cysteine, or beta-mercaptoethanol (betaME) leads to a dramatic increase of the protein affinity for calcium. Therefore, the biological function of S100A1 as a calcium signal transmitter is probably regulated by the redox potential within the cell. Systematic, structural studies of various mixed disulfides of S100A1 in the apo and holo states are necessary to elucidate the mechanism of this phenomenon. Using NMR methods we have determined the structure of apo-S100A1-betaME and, on the basis of 15N nuclear magnetic relaxation data, we have characterized the structural dynamics of both: modified and unmodified molecules of apo-S100A1. The following effects of betaME modification have been observed: (1) Helices IV and IV' of two protein subunits are elongated by five residues (85-89). (2) Conformation of the calcium binding N-terminal loops is dramatically changed, and structural flexibility of the N-loops as well as C-loops markedly increases. (3) The angle between helices I and IV increases by approximately 20 degrees and between helices IV and IV' decreases by approximately 35 degrees . All these observations lead to the conclusion that betaME modification of apo-S100A1 makes its structure more similar to that of holo-S100A1, so that it becomes much better adjusted for calcium coordination.
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
15
pubmed:volume
47
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
640-50
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Structural and motional changes induced in apo-S100A1 protein by the disulfide formation between its Cys 85 residue and beta-mercaptoethanol.
pubmed:affiliation
Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawi?skiego 5A, 02-106 Warsaw, Poland.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't