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Template:STRUCTURE 3msh

Contents 1 Crystal structure of Hepatitis B X-Interacting Protein at high resolution 2 Function 3 About this Structure 4 Reference

Crystal structure of Hepatitis B X-Interacting Protein at high resolution

Template:ABSTRACT PUBMED 21059355

Function

[HBXIP_HUMAN] As part of the Ragulator complex it is involved in amino acid sensing and activation of mTORC1, a signaling complex promoting cell growth in response to growth factors, energy levels, and amino acids. Activated by amino acids through a mechanism involving the lysosomal V-ATPase, the Ragulator functions as a guanine nucleotide exchange factor activating the small GTPases Rag. Activated Ragulator and Rag GTPases function as a scaffold recruiting mTORC1 to lysosomes where it is in turn activated. When complexed to BIRC5, interferes with apoptosome assembly, preventing recruitment of pro-caspase-9 to oligomerized APAF1, thereby selectively suppressing apoptosis initiated via the mitochondrial/cytochrome c pathway. Down-regulates hepatitis B virus (HBV) replication.^{[1] [2]}

About this Structure

3msh is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

• Garcia-Saez I, Lacroix FB, Blot D, Gabel F, Skoufias DA. Structural Characterization of HBXIP: The Protein That Interacts with the Anti-Apoptotic Protein Survivin and the Oncogenic Viral Protein HBx. J Mol Biol. 2010 Nov 6. PMID:21059355 doi:10.1016/j.jmb.2010.10.046

1. ↑ Marusawa H, Matsuzawa S, Welsh K, Zou H, Armstrong R, Tamm I, Reed JC. HBXIP functions as a cofactor of survivin in apoptosis suppression. EMBO J. 2003 Jun 2;22(11):2729-40. PMID:12773388 doi:10.1093/emboj/cdg263
2. ↑ Bar-Peled L, Schweitzer LD, Zoncu R, Sabatini DM. Ragulator is a GEF for the rag GTPases that signal amino acid levels to mTORC1. Cell. 2012 Sep 14;150(6):1196-208. doi: 10.1016/j.cell.2012.07.032. PMID:22980980 doi:10.1016/j.cell.2012.07.032