4roj

Structural highlights

Function

[VAV2_HUMAN] Guanine nucleotide exchange factor for the Rho family of Ras-related GTPases. Plays an important role in angiogenesis. Its recruitment by phosphorylated EPHA2 is critical for EFNA1-induced RAC1 GTPase activation and vascular endothelial cell migration and assembly (By similarity). [TXNIP_HUMAN] May act as an oxidative stress mediator by inhibiting thioredoxin activity or by limiting its bioavailability. Interacts with COPS5 and restores COPS5-induced suppression of CDKN1B stability, blocking the COPS5-mediated translocation of CDKN1B from the nucleus to the cytoplasm. Functions as a transcriptional repressor, possibly by acting as a bridge molecule between transcription factors and corepressor complexes, and over-expression will induce G0/G1 cell cycle arrest. Required for the maturation of natural killer cells. Acts as a suppressor of tumor cell growth. Inhibits the proteasomal degradation of DDIT4, and thereby contributes to the inhibition of the mammalian target of rapamycin complex 1 (mTORC1).^{[1] [2] [3] [4]}

References

1. ↑ Liyanage NP, Fernando MR, Lou MF. Regulation of the bioavailability of thioredoxin in the lens by a specific thioredoxin-binding protein (TBP-2). Exp Eye Res. 2007 Aug;85(2):270-9. Epub 2007 May 21. PMID:17603038 doi:S0014-4835(07)00133-9
2. ↑ Han SH, Jeon JH, Ju HR, Jung U, Kim KY, Yoo HS, Lee YH, Song KS, Hwang HM, Na YS, Yang Y, Lee KN, Choi I. VDUP1 upregulated by TGF-beta1 and 1,25-dihydorxyvitamin D3 inhibits tumor cell growth by blocking cell-cycle progression. Oncogene. 2003 Jun 26;22(26):4035-46. PMID:12821938 doi:10.1038/sj.onc.1206610
3. ↑ Shin KH, Kim RH, Kim RH, Kang MK, Park NH. hnRNP G elicits tumor-suppressive activity in part by upregulating the expression of Txnip. Biochem Biophys Res Commun. 2008 Aug 8;372(4):880-5. doi:, 10.1016/j.bbrc.2008.05.175. Epub 2008 Jun 9. PMID:18541147 doi:10.1016/j.bbrc.2008.05.175
4. ↑ Jin HO, Seo SK, Kim YS, Woo SH, Lee KH, Yi JY, Lee SJ, Choe TB, Lee JH, An S, Hong SI, Park IC. TXNIP potentiates Redd1-induced mTOR suppression through stabilization of Redd1. Oncogene. 2011 Sep 1;30(35):3792-801. doi: 10.1038/onc.2011.102. Epub 2011 Apr 4. PMID:21460850 doi:10.1038/onc.2011.102