Table 1.

Reaction rates (k) or dissociation constant (K) in the presence of ATP and uridine triphosphate (UTP)

Transition constant	No. in Fig. 1	ATP	UTP
Reactions of myosin
kMT→MDP (s−1)	1	25	3.5
Reactions of actomyosin
kAMT→AMDP (s−1)	2	0.44	0.06
kAMDP→AMD+ P (s−1)	3	23	40
KAMD→AM+ D (μM)	4	50–100	>2000
kAMD→AM+ D (s−1)	4	∼500	>2000 (est)
kAM + T→AMT (M−1 s−1)	5	9 × 105	1.1 × 105
kAMT→MT (s−1)	6	∼2000	760