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The Crystal Structure of Uncomplexed Actin in the ADP State
Ludovic R. Otterbein,Philip Graceffa,Roberto Dominguez*
The dynamics and polarity of actin filaments are
controlled by a conformational change coupled to the hydrolysis of
adenosine5'-triphosphate (ATP) by a mechanism that remains to be
elucidated.Actin modified to block polymerization was crystallized in
theadenosine 5'-diphosphate (ADP) state, and the structure was solvedto 1.54 angstrom resolution. Compared with previous ATP-actinstructures from complexes with deoxyribonuclease I, profilin,and
gelsolin, monomeric ADP-actin is characterized by a markedconformational change in subdomain 2. The successful crystallizationof
monomeric actin opens the way to future structure determinationsof
actin complexes with actin-binding proteins such as myosin.
Boston Biomedical Research Institute, 64 Grove Street, Watertown,
MA 02472, USA.
*
To whom correspondence should be addressed. E-mail:
dominguez{at}bbri.org
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