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2017 ; 8
(4
): 237-244
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Cdc42 in actin dynamics: An ordered pathway governed by complex equilibria and
directional effector handover
#MMPMID27715449
Watson JR
; Owen D
; Mott HR
Small GTPases
2017[Oct]; 8
(4
): 237-244
PMID27715449
show ga
The small GTPase, Cdc42, is a key regulator of actin dynamics, functioning to
connect multiple signals to actin polymerization through effector proteins of the
Wiskott-Aldrich syndrome protein (WASP) and Transducer of Cdc42-dependent actin
assembly (TOCA) families. WASP family members serve to couple Cdc42 with the
actin nucleator, the Arp2/3 complex, via direct interactions. The regulation of
these proteins in the context of actin dynamics has been extensively studied.
Studies on the TOCA family, however, are more limited and relatively little is
known about their roles and regulation. In this commentary we highlight new
structural and biophysical insight into the involvement of TOCA proteins in the
pathway of Cdc42-dependent actin dynamics. We discuss the biological implications
of the low affinity interactions between the TOCA family and Cdc42, as well as
probing the sequential binding of TOCA1 and the WASP homolog, N-WASP, to Cdc42.
We place our current research in the context of the wealth of biophysical,
structural and functional data from earlier studies pertaining to the
Cdc42/N-WASP/Arp2/3 pathway of actin polymerization. Finally, we describe the
molecular basis for a sequential G protein-effector handover from TOCA1 to
N-WASP.