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L-Thyroxine (T4) and L-triiodothyronine (T3) specifically, inhibited myosin light chain kinase (MLC-kinase) from various tissues whereas inhibitory effects of T4 and T3 on other protein kinases such as protein kinase C, cAMP-dependent protein kinase, casein kinase I, casein kinase II and calmodulin kinase II were much weaker. T4 was a more potent inhibitor of MLC-kinase than T3. Kinetic studies showed that T4 behaved as a competitive inhibitor of MLC-kinase toward calmodulin (CaM) and that Ki value was 2.5 microM. The activity of the catalytic fragment of MLC-kinase, which is active without CaM, was not inhibited by T4. 125I-T4 gel overlay revealed that CaM did not bind T4 but MLC-kinase had 125I-T4 binding activity. These observations suggest that T4 binds at or near CaM binding domain of MLC-kinase and inhibits CaM-induced activation of MLC-kinase.
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