FEATURES

FAMILY

DESCRIPTION

Also known as UNC89_CAEEL, unc-89. Structural component of the muscle M line which is involved in assembly and organization of sarcomere myofilaments (PubMed:15313609, PubMed:16453163, PubMed:18801371, PubMed:22621901, PubMed:23283987, PubMed:27009202). The large isoform a, isoform b, isoform d and isoform f play an essential role in maintaining the organization of sarcomeres but not myofilament alignment during body wall muscle development whereas the small isoform c and isoform d appear to have a minor role (PubMed:15313609, PubMed:16453163, PubMed:22768340). Isoform b and isoform f are required for the organization of unc-15/paramyosin into sarcomere thick filaments in body wall muscles (PubMed:27009202). By binding mel-26, a substrate adapter of the cul-3 E3 ubiquitin-protein ligase complex, regulates the organization of myosin thick filaments, likely by preventing the degradation of microtubule severing protein mei-1 (PubMed:22621901). Acts as guanine nucleotide exchange factor (GEF) for Rho GTPase rho-1 but not ced-10, mig-2 and cdc-42 (PubMed:18801371). The large isoforms regulate Ca(2+) signaling during muscle contraction by ensuring the correct localization of sarco-endoplamic reticulum Ca(2+) ATPase sca-1 and ryanodine receptor unc-68 (PubMed:22768340). By controlling the contraction and/or organization of pharyngeal muscles, plays a role in the formation of pharyngeal gland cell extension (PubMed:21868609). May interact (via fibronectin type-III domain 1, Ig-like C2-type domain 48/49 and protein kinase domain 1 or C-terminus of the interkinase region) with lim-9 (via LIM zinc-binding domain) (PubMed:19244614). May interact (via fibronectin type-III domain 1, Ig-like C2-type domain 48/49 and kinase protein domain 1 or Ig-like C2-type domain 50, fibronectin type-III domain 2 and kinase protein domain 2) with scpl-1 isoforms a and b (via FCP1 homology domain); the interaction may act as a molecular bridge to bring two unc-89 molecules together or to stabilize a loop between the 2 kinase domains (PubMed:18337465, PubMed:19244614). May interact (via SH3 domain) with unc-15 (PubMed:27009202). May interact (via Ig-like C2-type domain 1-3) with cpna-1 (via VWFA domain) (PubMed:23283987). May interact (via Ig-like C2-type domain 2/3 and, Ig-like C2-type domain 50 and fibronectin type-III domain 2) with mel-26 (via MATH domain) (PubMed:22621901). May interact (via DH and PH domains) with rho-1, ced-10, mig-2 and cdc-42 (PubMed:18801371).

EXTERNAL LINKS

unc-89

Mutations

Mutation(s) distribution

Mutations table