TMOD4 encodes a muscle-specific member of the tropomodulin family of actin-regulatory proteins. The encoded protein caps the pointed end of actin filaments preventing both elongation and depolymerization. The capping activity of this protein is dependent on its association with tropomyosin. Alternatively spliced transcript variants encoding different isoforms have been described.
Human TMOD4 encodes a deduced 345-amino acid protein. Northern blot analysis on human tissues detected a prominent 1.3- to 1.5-kb transcript in skeletal muscle. Three faint transcripts were detected: a 6.8-kb transcript in heart and skeletal muscle, and 2.4 and 3.0 transcripts in skeletal muscle.
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