Heavy meromyosin

Heavy meromyosin (HMM) is the larger of the two fragments obtained from the muscle protein myosin II following limited proteolysis by trypsin or chymotrypsin.[1] HMM contains two domains S-1 and S-2, S-1 contains is the globular head that can bind to actin while the S-2 domain projects at and angle from light meromyosin (LMM) connecting the two meromyosin fragments.

HMM is used to determine the polarity of actin filaments by decorating them with HMM then viewing them under the electron microscope.[2]

References
  1. Sellers, J. R. (1985). "Mechanism of the phosphorylation-dependent regulation of smooth muscle heavy meromyosin". The Journal of Biological Chemistry. 260 (29): 15815–15819. doi:10.1016/S0021-9258(17)36331-7. PMID 2933403.
  2. Woodrum, D. T.; Rich, S. A.; Pollard, T. D. (1975). "Evidence for biased bidirectional polymerization of actin filaments using heavy meromyosin prepared by an improved method". Journal of Cell Biology. 67 (1): 231–237. doi:10.1083/jcb.67.1.231. PMC 2109590. PMID 240859.


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