MS-681A, MS-681B, MS-681C AND MS-681D, NEW INHIBITORS OF MYOSIN LIGHT-CHAIN KINASE FROM MYROTHECIUM SP. KY6568 - I - CHARACTERIZATION OF PRODUCING STRAIN AND PRODUCTION, ISOLATION AND BIOLOGICAL-ACTIVITIES
H. Yano et al., MS-681A, MS-681B, MS-681C AND MS-681D, NEW INHIBITORS OF MYOSIN LIGHT-CHAIN KINASE FROM MYROTHECIUM SP. KY6568 - I - CHARACTERIZATION OF PRODUCING STRAIN AND PRODUCTION, ISOLATION AND BIOLOGICAL-ACTIVITIES, Journal of antibiotics, 50(12), 1997, pp. 992-997
Novel compounds MS-681a, b, c and d were isolated from the culture bro
th of a fungal strain KY6568. The strain was identified as Myrothecium
sp. from its morphological characteristics. MS-681a, b, c and d inhib
ited the activity of purified smooth muscle myosin light chain kinase
with IC50 values of 0.11, 0.29, 0.095 and 0.26 mu M, respectively. Cyc
lic AMP-dependent protein kinase, cyclic GMP-dependent protein kinase
and protein kinase C were not inhibited at 100 mu M by MS-681 compound
s.