GTPase-activating proteins (GAPs) accelerate the intrinsic rate of GTP hydrolysis of Ras-related proteins, resulting in downregulation of their active form. TBC1D2 (TBC1 domain family member 2), also known as Armus or PARIS-1 (prostate antigen recognized and identified by SEREX 1), is a 928aa protein containing a Rab-GAP TBC domain and a PH domain. Localizing to cytoplasm, cytoplasmic vesicles and cell junctions, TBC1D2 is expressed in a broad range of tissues, including kidney, liver, lung and placenta, as well as in keratinocytes and epithelia-containing organs. TBC1D2 functions as a GTPase-activating protein for RAB7, and also acts as a linker between RAB7 and RAC1, which leads to RAB7A inactivation and inhibition of E-cadherin degradation. Existing as six alternatively spliced isoforms, the gene encoding TBC1D2 maps to human chromosome 9q22.33.
Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.