Linked Life Data

15853941

Source:http://linkedlifedata.com/resource/pubmed/id/15853941

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2005-4-27
pubmed:abstractText
A 16 residues long, water soluble, monomeric beta-hairpin peptide 'trpzip', stabilized by tryptophan zipper has been linked via a tetraglycyl linker to a hydrophobic didehydrophenylalnine (DeltaF) containing helical octapeptide. Circular dichroism studies of this 28 residues long peptide, 'trpzipalpha' (Ac-GEWTWDDATKTWTWTE-GGGG-DeltaFALDeltaFALDeltaFA-NH(2)) in water have revealed the presence of both the beta-hairpin and the helical conformations. This is the first instance where a DeltaF containing peptide has been found to display a helical fold in water. The fluorescence emission wavelengths of tryptophan in Ac-G-W-G-NH(2), trpzip and trpzipalpha were 341.5, 332.8 and 332.6 nm, respectively. The fluorescence quantum yield of trpzip was 2.6-fold higher than trpzipalpha suggesting that proximal interactions between the beta-hairpin and the helix caused the quenching of tryptophan fluorescence in the former by the DeltaFs in the latter. The molar ellipticity of the far UV couplet characteristic of trpzip was reduced in trpzipalpha and the CD based thermal melting temperatures at 228 nm were 62 degrees C (trpzip) and 57 degrees C (trpzipalpha). A concentration-dependent variable temperature CD study in water showed that in trpzipalpha, increasing temperature is detrimental to the beta-hairpin, but it augments the helical motif, perhaps by intermolecular oligomerization. Our results show that in water, trpzipalpha exhibits long-range interactions between two different secondary structures. In contrast to trpzip, trpzipalpha has shown a greater tendency to oligomerize in water.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
1397-002X
pubmed:author
pubmed:issnType
Print
pubmed:volume
65
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
475-84
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
A Meccano set approach of joining trpzip a water soluble beta-hairpin peptide with a didehydrophenylalanine containing hydrophobic helical peptide.
pubmed:affiliation
International Centre For Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't