Journal
BIOCHEMISTRY
Volume 41, Issue 26, Pages 8508-8517Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bi015969u
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- NIAMS NIH HHS [AR35661] Funding Source: Medline
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Myosin V is a molecular motor shown to move processively along actin filaments. We investigated the properties of the weak binding states of monomeric myosin V containing a single IQ domain (MV 1IQ) to determine if the affinities of these states are increased as compared to conventional myosin. Further, using a combination of non-hydrolyzable nucleotide analogues and mutations that block ATP hydrolysis, we sought to probe the states that are populated during ATP-induced dissociation of actomyosin. MV 1IQ binds actin with a K-d = 4 muM in the presence of ATPgammaS at 50 MM KCl, which is 10-20-fold tighter than that of nonprocessive class H myosins. Mutations within the switch II region trapped MV 1IQ in two distinct M.ATP states with very different actin binding affinities (K-d = 0.2 and 2 muM). Actin binding may change the conformation of the switch II region, suggesting that elements of the nucleotide binding pocket will be in a different conformation when bound to actin than is seen in any of the myosin crystal structures to date.
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