>cd01386 MYSc_type_XVIII Myosin motor domain, type XVIII myosins. This catalytic (head) domain has ATPase activity and belongs to the larger group of P-loop NTPases. Myosins are actin-dependent molecular motors that play important roles in muscle contraction, cell motility, and organelle transport. The head domain is a molecular motor, which utilizes ATP hydrolysis to generate directed movement toward the plus end along actin filaments. A cyclical interaction between myosin and actin provides the driving force. Rates of ATP hydrolysis and consequently the speed of movement along actin filaments vary widely, from about 0.04 micrometer per second for myosin I to 4.5 micrometer per second for myosin II in skeletal muscle. Myosin II moves in discrete steps about 5-10 nm long and generates 1-5 piconewtons of force. Upon ATP binding, the myosin head dissociates from an actin filament. ATP hydrolysis causes the head to pivot and associate with a new actin subunit. The release of Pi causes the

Probab=93.67  E-value=0.048  Score=34.08  Aligned_cols=24  Identities=21%  Similarity=0.281  Sum_probs=18.9

Q ss_pred             CCCEEEEEECCCCCHHHHHHHHHH
Q ss_conf             432048873277743679999998
Q gi|254780916|r  161 DCAIPIMIQGEFGVGKKRLSRFIH  184 (482)
Q Consensus       161 ~~~~~vli~Ge~GtGK~~~A~~iH  184 (482)
T Consensus        84 ~~nQsIIiSGESGAGKTEstK~im  107 (767)
T cd01386          84 RRDQSIIFLGRSGAGKTTSCKHAL  107 (767)
T ss_pred             CCCCEEEEECCCCCCHHHHHHHHH
T ss_conf             899579995589888889999999