How guanylate-binding proteins achieve assembly-stimulated processive cleavage of GTP to GMP

Nature
Agnidipta GhoshC Herrmann

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 nucleoti...Continue Reading

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Citations

May 9, 2009·Nature Reviews. Molecular Cell Biology·Raphael GasperAlfred Wittinghofer
Jan 12, 2012·Nature Reviews. Molecular Cell Biology·Shawn M Ferguson, Pietro De Camilli
Oct 7, 2009·Proceedings of the National Academy of Sciences of the United States of America·Minhajuddin SirajuddinAlfred Wittinghofer
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