Linked Life Data

7703700

Source:http://linkedlifedata.com/resource/pubmed/id/7703700

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1995-5-10
pubmed:abstractText
A large portion of the 13C resonance assignments for murine epidermal growth factor (mEGF) at pH 3.1 and 28 degrees C has been determined at natural isotope abundance. Sequence-specific 13C assignments are reported for 100% of the assignable C alpha, 96% of the C beta, 86% of the aromatic and 70% of the remaining peripheral aliphatic resonances of mEGF. A good correlation was observed between experimental and back-calculated C alpha chemical shifts for regions of regular beta-sheet structure. These assignments also provide the basis for interpreting 1H alpha-13C alpha heteronuclear NOE (HNOE) values in mEGF at natural isotope abundance. Some of the backbone polypeptide segments with high internal mobility, indicated by these 1H alpha-13C alpha HNOE measurements, correlate with locations of residues involved in the putative mEGF-receptor binding site. Using four families of mEGF structures obtained over the last few years, we demonstrate that standard deviations between experimental and back-calculated delta delta C alpha values can be used to monitor the refinement of this protein's structure, particularly for beta-sheet regions. Improved agreement between calculated and observed values of delta delta C alpha is correlated with other measures of structure quality, including lowered values of residual constraint violations and more negative values of conformational energy. These results support the view that experimental conformation-dependent chemical shifts, delta delta C alpha, can provide a reliable source of information for monitoring the process of protein structure refinement and are potentially useful restraints for driving the refinement.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0925-2738
pubmed:author
pubmed:issnType
Print
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
161-72
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Combined use of 13C chemical shift and 1H alpha-13C alpha heteronuclear NOE data in monitoring a protein NMR structure refinement.
pubmed:affiliation
Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ 08854.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't