Cytoskeleton-associated proteins (CAPs) are involved in the organisation of microtubules and transportation of vesicles and organelles along the cytoskeletal network. A conserved motif, CAP-Gly, has been identified in a number of CAPs, including CLIP-170 and dynactins. The crystal structure of Caenorhabditis elegans F53F4.3 protein Swiss:Q20728 CAP-Gly domain was recently solved [2]. The domain contains three beta-strands. The most conserved sequence, GKNDG, is located in two consecutive sharp turns on the surface, forming the entrance to a groove [2].

1: Sequence homologies between four cytoskeleton-associated proteins. Riehemann K, Sorg C; Trends Biochem Sci 1993;18:82-83. PMID:8480366

2: Crystal structure of the cytoskeleton-associated protein glycine-rich (CAP-Gly) domain. Li S, Finley J, Liu ZJ, Qiu SH, Chen H, Luan CH, Carson M, Tsao J, Johnson D, Lin G, Zhao J, Thomas W, Nagy LA, Sha B, DeLucas LJ, Wang BC, Luo M; J Biol Chem 2002;277:48596-48601. PMID:12221106