1f5n
HUMAN GUANYLATE BINDING PROTEIN-1 IN COMPLEX WITH THE GTP ANALOGUE, GMPPNP.
Structural highlights
FunctionGBP1_HUMAN Hydrolyzes GTP to GMP in two consecutive cleavage reactions. Exhibits antiviral activity against influenza virus. Promote oxidative killing and deliver antimicrobial peptides to autophagolysosomes, providing broad host protection against different pathogen classes.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe interferon-gamma-induced guanylate-binding protein 1 (GBP1) belongs to a special class of large GTP- binding proteins of 60-100 kDa with unique characteristics. Here we present the structure of human GBP1 in complex with the non-hydrolysable GTP analogue GppNHp. Basic features of guanine nucleotide binding, such as the P-loop orientation and the Mg(2+) co-ordination, are analogous to those of Ras-related and heterotrimeric GTP-binding proteins. However, the glycosidic bond and thus the orientation of the guanine base and its interaction with the protein are very different. Furthermore, two unique regions around the base and the phosphate-binding areas, the guanine and the phosphate caps, respectively, give the nucleotide-binding site a unique appearance not found in the canonical GTP-binding proteins. The phosphate cap, which constitutes the region analogous to switch I, completely shields the phosphate-binding site from solvent such that a potential GTPase-activating protein cannot approach. This has consequences for the GTPase mechanism of hGBP1 and possibly of other large GTP-binding proteins. Triphosphate structure of guanylate-binding protein 1 and implications for nucleotide binding and GTPase mechanism.,Prakash B, Renault L, Praefcke GJ, Herrmann C, Wittinghofer A EMBO J. 2000 Sep 1;19(17):4555-64. PMID:10970849[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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