Linked Life Data

9048566

Source:http://linkedlifedata.com/resource/pubmed/id/9048566

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
1997-3-20
pubmed:abstractText
Nebulin, a giant actin binding protein, coextends with actin and is thought to form a composite thin filament in the skeletal muscle sarcomere. To understand the molecular interactions between nebulin and actin, we have applied chemical cross-linking techniques to define molecular contacts between actin and ND8, a two-module nebulin fragment that promotes actin polymerization and inhibits depolymerization by binding to both G- and F-actin. The formation of a 1:1 complex with a dissociation constant of 4.9 microM between ND8 and G-actin was demonstrated by fluorescence titration of dansyl-ND8 with G-actin. Treatment with a zero-length cross-linker, l-ethyl-3-[3-(dimethylamino) propyl]carbodiimide (EDC), cross-linked the ND8-G-actin complex covalently without impairing actin's ability to polymerize. End-labeling Western blot and sequence and mass analyses of purified conjugated peptides revealed the cross-linking between lysine 5 of ND8 and the two N-terminal acidic residues of G-actin. Similarly, we have shown by end-labeling that cross-linking of ND8 to F-actin occurred at the N-terminus of actin protomer. The binding of nebulin to the N-terminus of actin is likely to be significant in its ability to affect actin polymerization. Furthermore, the association of nebulin modules with the actin N-terminus in subdomain 1 supports the hypothesis that nebulin wraps around the outer edges of actin filaments where Sl, tropomyosin, and several actin binding proteins are known to interact.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
18
pubmed:volume
36
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1814-25
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Molecular contacts between nebulin and actin: cross-linking of nebulin modules to the N-terminus of actin.
pubmed:affiliation
Department of Chemistry and Biochemistry, University of Texas at Austin 78712, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't