Anti-TRBP/TARBP2 Antibody Picoband® Fluoro488 Conjugated

RISC-loading complex subunit TARBP2 is a protein that in humans is encoded by the TARBP2 gene. HIV-1, the causative agent of acquired immunodeficiency syndrome (AIDS), contains an RNA genome that produces a chromosomally integrated DNA during the replicative cycle. Activation of HIV-1 gene expression by the transactivator Tat is dependent on an RNA regulatory element (TAR) located downstream of the transcription initiation site. The protein encoded by this gene binds between the bulge and the loop of the HIV-1 TAR RNA regulatory element and activates HIV-1 gene expression in synergy with the viral Tat protein. Alternative splicing results in multiple transcript variants encoding different isoforms. This gene also has a pseudogene.

Isoform 1 is expressed in brain, pancreas, stomach, the colon cancer cell line LoVo and the T-lymphoblastoma Jurkat, but not in heart, placenta, liver, lung, skeletal muscle, kidney or the stomach cancer cell line AGS. Expressed at high levels in the small cell lung cancer cell line NCI-H510, at lower levels in NCI-H345, NCI-H69 and GLC-28 cell lines, not expressed in GLC-19 cell line. Within the stomach, expressed at high levels in the mucosa of the gastric fundus and at low levels in the antrum and duodenum. Isoform 2 is present in pancreatic cancer cells and colorectal cancer cells, but not in normal pancreas or colonic mucosa. Isoform 3 is expressed in brain, pancreas, stomach, the stomach cancer cell line AGS and the colon cancer cell line LoVo.

Receptor for gastrin and cholecystokinin. The CKK-B receptors occur throughout the central nervous system where they modulate anxiety, analgesia, arousal, and neuroleptic activity. This receptor mediates its action by association with G proteins that activate a phosphatidylinositol-calcium second messenger system.

1. Chendrimada, T. P., Gregory, R. I., Kumaraswamy, E., Norman, J., Cooch, N., Nishikura, K., Shiekhattar, R. TRBP recruits the Dicer complex to Ago2 for microRNA processing and gene silencing. (Letter) Nature 436: 740-744, 2005. 2. Garre, P., Perez-Segura, P., Diaz-Rubio, E., Caldes, T., de la Hoya, M. Reassessing the TARBP2 mutation rate in hereditary nonpolyposis colorectal cancer. (Letter) Nature Genet. 42: 817-818, 2010. 3. Gatignol, A., Buckler-White, A., Berkhout, B., Jeang, K. T. Characterization of a human TAR RNA-binding protein that activates the HIV-1 LTR. Science 251: 1597-1600, 1991.