Localization of a calcium sensitive binding site for gelsolin on actin subdomain I: implication for severing process.
The binding of the N-terminal domain (S1) of gelsolin to monomeric actin has been extensively documented. In contrast, the location of the C-terminal calcium dependent domains (S4-6) interacting with the actin filament during the severing process remains uncertain. In this study, we have identified a new interface that supports calcium dependent gelsolin binding to actin. This site is located in a critical position towards actin-actin contact in the filament and in the vicinity of the phalloidin site. Using specific antibody and synthetic peptides derived from actin sequence within 105-132 residues, this interface was finally ascribed to the segment 112-120 on the actin subdomain-1.
Feinberg
J
J
Centre de Recherches de Biochimie Macromoléculaire (CNRS), Laboratoirede Recherche sur la Motilité Cellulaire (Ecole Pratique des Hautes Etudes), Université de Montpellier 1, France.
Lebart
M
M
Benyamin
Y
Y
Roustan
C
C
D000199:Actins / Q000378:metabolism*; D000818:Animals; D001665:Binding Sites; D002118:Calcium / Q000378:metabolism*; D018260:Gelsolin / Q000378:metabolism*; D011817:Rabbits
D000199:Actins; D018260:Gelsolin; D002118:Calcium