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2B92

Crystal-structure of the N-terminal Large GTPase Domain of human Guanylate Binding protein 1 (hGBP1) in complex with GDP/AlF3

Summary for 2B92
Entry DOI10.2210/pdb2b92/pdb
Related1DG3 1F5N 2B8W 2BC9 2D4H
DescriptorInterferon-induced guanylate-binding protein 1, MAGNESIUM ION, GUANOSINE-5'-DIPHOSPHATE, ... (5 entities in total)
Functional Keywordsprotein- guanine nucleotide complex, signaling protein
Biological sourceHomo sapiens (human)
Cellular locationCytoplasm : P32455
Total number of polymer chains2
Total formula weight75259.86
Authors
Ghosh, A.,Praefcke, G.J.K.,Renault, L.,Wittinghofer, A.,Herrmann, C. (deposition date: 2005-10-10, release date: 2006-03-07, Last modification date: 2023-08-23)
Primary citationGhosh, A.,Praefcke, G.J.,Renault, L.,Wittinghofer, A.,Herrmann, C.
How guanylate-binding proteins achieve assembly-stimulated processive cleavage of GTP to GMP.
Nature, 440:101-104, 2006
Cited by
PubMed Abstract: Interferons are immunomodulatory cytokines that mediate anti-pathogenic and anti-proliferative effects in cells. Interferon-gamma-inducible human guanylate binding protein 1 (hGBP1) belongs to the family of dynamin-related large GTP-binding proteins, which share biochemical properties not found in other families of GTP-binding proteins such as nucleotide-dependent oligomerization and fast cooperative GTPase activity. hGBP1 has an additional property by which it hydrolyses GTP to GMP in two consecutive cleavage reactions. Here we show that the isolated amino-terminal G domain of hGBP1 retains the main enzymatic properties of the full-length protein and can cleave GDP directly. Crystal structures of the N-terminal G domain trapped at successive steps along the reaction pathway and biochemical data reveal the molecular basis for nucleotide-dependent homodimerization and cleavage of GTP. Similar to effector binding in other GTP-binding proteins, homodimerization is regulated by structural changes in the switch regions. Homodimerization generates a conformation in which an arginine finger and a serine are oriented for efficient catalysis. Positioning of the substrate for the second hydrolysis step is achieved by a change in nucleotide conformation at the ribose that keeps the guanine base interactions intact and positions the beta-phosphates in the gamma-phosphate-binding site.
PubMed: 16511497
DOI: 10.1038/nature04510
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (3.2 Å)
Structure validation

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