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J Biol Chem, Vol. 273, Issue 30, 19329-19338, July 24, 1998
From the Department of Cell Biology and Biochemistry and the Howard
Hughes Medical Institute, Duke University Medical Center,
Durham, North Carolina 27710
Adducin is a protein associated with spectrin and
actin in membrane skeletons of erythrocytes and possibly other cells.
Adducin has activities in in vitro assays of association
with the sides of actin filaments, capping the fast growing ends of
actin filaments, and recruiting spectrin to actin filaments. This study
presents evidence that adducin exhibits a preference for the fast
growing ends of actin filaments for recruiting spectrin to actin and
for direct association with actin.
Adducin Preferentially Recruits Spectrin to the Fast Growing Ends
of Actin Filaments in a Complex Requiring the MARCKS-related Domain and
a Newly Defined Oligomerization Domain
-Adducin-(335-726) promoted
recruitment of spectrin to gelsolin-sensitive sites at fast growing
ends of actin filaments with half-maximal activity at 15 nM
and to gelsolin-insensitive sites with half-maximal activity at 75 nM.
-Adducin-(335-726) also exhibited a preference for
actin filament ends in direct binding assays; the half-maximal
concentration for binding of adducin to gelsolin-sensitive sites at
filament ends was 60 nM, and the Kd for
binding to lateral sites was 1.5 µM. The concentration of
-adducin-(335-726) of 60 nM required for half-maximal binding to filament ends is in the same range as the concentration of
150 nM required for half-maximal actin capping activity.
All interactions of adducin with actin require the myristoylated
alanine-rich protein kinase C substrate-related domain as well as a
newly defined oligomerization site localized in the neck domain of
adducin. Surprisingly, the head domain of adducin is not required for
spectrin-actin interactions, although it could play a role in forming
tetramers. The relative activities of adducin imply that an important
role of adducin in cells is to form a complex with the fast growing ends of actin filaments that recruits spectrin and prevents addition or
loss of actin subunits.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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