Linked Life Data

17144659

Source:http://linkedlifedata.com/resource/pubmed/id/17144659

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
49
pubmed:dateCreated
2006-12-5
pubmed:abstractText
Fluoro alcohols present in aqueous solutions can alter the dominant conformations of peptides and proteins. The origins of these effects likely are related to the details of solute-fluoro alcohol interactions. Preferential interaction of the fluoro alcohol component of a fluoro alcohol-water mixture with peptide solutes has been demonstrated by several experimental approaches. In the present work, we have used 1H{19F} intermolecular NOE experiments to examine interactions of hexafluoro-2-propanol in a 30% fluoro alcohol-50 mM phosphate buffer solvent mixture with the "Trp-cage" peptide (NLY IQW LKD GGP SSG RPP PS). The results show that the peptide is selectively solvated by hexafluoro-2-propanol to the extent that the fluoro alcohol concentration near the peptide may be 3 to 4 times higher than the nominal concentration of fluoro alcohol in the bulk sample. The observed NOEs indicate that peptide-fluoro alcohol interactions persist for times of the order of 1 ns at 5 degrees C. As the sample temperature is increased, the lifetimes of fluoro alcohol interactions with several exposed side chains decrease to the extent that the peptide hydrogen-solvent fluorine interactions appear to become diffusive in nature, with interaction lifetimes of approximately 0.03 ns. It is known that protein molecules can provide specific sites for binding small organic solvent molecules. Our work suggests that small peptides also have this ability and that the dynamics for such interactions can be site-specific.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
12
pubmed:volume
45
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
14665-74
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Interactions of hexafluoro-2-propanol with the Trp-cage peptide.
pubmed:affiliation
Department of Chemistry and Biochemistry, University of California. Santa Barbara, California 93106, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.