Protein kinase C-related kinase homology region 1 (HR1) Rho-binding domain of Schizosaccharomyces pombe Ste20-like proteins
This group is composed of predominantly uncharacterized fungal proteins, which contain two known domains: HR1 at the N-terminal region and REM (Ras exchanger motif) at the C-terminal region. One member protein from Schizosaccharomyces pombe is named Ste16 while its gene is called ste20 (a target of rapamycin complex 2 subunit). It is a subunit in the protein kinase TOR complexes in fission yeast. The REM domain is usually found in nucleotide exchange factors for Ras-like small GTPases. HR1 domains are anti-parallel coiled-coil (ACC) domains that bind small GTPases from the Rho family.
Jiyao W et al.(2023). "The conserved domain database in 2023.",