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Conformational and functional studies of three gelsolin subdomain‐1 synthetic peptides and their implication in actin polymerization
Author(s) -
Feinberg Jeanne,
Mery Jean,
Heitz Frédéric,
Benyamin Yves,
Roustan Claude
Publication year - 1997
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/(sici)1097-0282(199705)41:6<647::aid-bip5>3.0.co;2-q
Subject(s) - gelsolin , chemistry , actin , polymerization , actin binding protein , peptide , actina , actin remodeling , biophysics , sequence (biology) , mdia1 , microfilament , biochemistry , actin cytoskeleton , cytoskeleton , polymer , biology , organic chemistry , cell
Gelsolin, a calcium and inositol phospholipid‐sensitive protein, regulates actin filament length. Its activity is complex (capping, severing, etc.) and is supported by several functional domains. The N‐terminal domain alone (S1), in particular, is able to impede actin polymerization. Our investigations were attempted to precise this inhibitory process by using synthetic peptides as models mimicking gelsolin S1 activity. Three peptides issued from S1 and located in gelsolin—actin interfaces were synthesized. The peptides (15–28, 42–55, and 96–114 sequences) were tested for their conformational and actin binding properties. Although the three peptides interact well with actin, only peptide 42–55 affects actin polymerization. A detailed kinetic study shows that the latter peptide essentially inhibits the nucleation step during actin polymerization. In conclusion, the present work shows that the binding of a synthetic peptide to a small sequence located outside the actin—actin interface is essential in the actin polymerization process. © 1997 John Wiley & Sons, Inc. Biopoly 41: 647–655, 1997