Tetratricopeptide repeat domain 1 (TTC1)

Tetratricopeptide repeat domain 1 (TTC1) is a protein that features tetratricopeptide repeats (TPR), which are structural motifs that mediate protein–protein interactions[1][3][5]. TTC1 functions prominently as an adaptor protein bridging the signaling between heterotrimeric G protein subunits and the small GTPase Ras, directly interacting with multiple Galpha subunits and preferentially binding to the active, GTP-bound form of Ras[1]. This adaptor role facilitates signal transduction from G protein-coupled receptors to downstream Ras-dependent mitogenic pathways such as ERK and IκB kinase activation. In addition to serving as a signaling scaffold, TTC1 also acts as a chaperone adaptor, promoting protein folding in synergy with chaperones like Hsp70 and Hsp40[1]. While TPR domain-containing proteins are implicated in a variety of cellular processes—including cell cycle regulation, transcriptional control, and mitochondrial function—TTC1 itself is chiefly recognized for its roles in maintaining proteostasis and regulating Ras signaling cascades[1][6]. TTC1 is a protein-coding gene (human gene symbol: TTC1, NCBI Gene ID: 7265), with mutations or dysregulation associated with conditions such as Seckel syndrome and inflammatory bowel disease[7]. No approved therapeutic drugs, mechanisms of action, or established biomarkers relating to TTC1 have been reported in current sources.

Other names

TPR1TPR repeat protein 1tetratricopeptide repeat domain 14833412C19RikLOC100130486