Tropomodulin is a novel tropomyosin regulatory protein that binds to the end of erythrocyte tropomyosin and blocks head-to-tail association of tropomyosin along actin filaments [1]. Limited proteolysis shows this protein is composed of two domains [2]. The amino terminal domain contains the tropomyosin binding function [2].

1: Molecular cloning and characterization of human fetal liver tropomodulin. A tropomyosin-binding protein. Sung LA, Fowler VM, Lambert K, Sussman MA, Karr D, Chien S; J Biol Chem 1992;267:2616-2621. PMID:1370827

2: Domain structure of tropomodulin: distinct properties of the N-terminal and C-terminal halves. Kostyukova A, Maeda K, Yamauchi E, Krieger I, Maeda Y; Eur J Biochem 2000;267:6470-6475. PMID:11029591

3: Leiomodins: larger members of the tropomodulin (Tmod) gene family. Conley CA, Fritz-Six KL, Almenar-Queralt A, Fowler VM; Genomics 2001;73:127-139. PMID:11318603