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Structure of a complex of the golgin-245 GRIP domain with Arl1Structure of a complex of the golgin-245 GRIP domain with Arl1
Structural highlights
FunctionARL1_HUMAN GTP-binding protein that has very low efficiency as allosteric activator of the cholera toxin catalytic subunit, an ADP-ribosyltransferase. Can activate phospholipase D with very low efficiency. Important for normal function of the Golgi apparatus.[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 PubMedGolgins are large coiled-coil proteins that play a role in Golgi structure and vesicle traffic. The Arf-like GTPase Arl1 regulates the translocation of GRIP domain-containing golgins to Golgi membranes. We report here the 1.7 A resolution structure of human Arl1-GTP in a complex with the GRIP domain of golgin-245. The structure reveals that the GRIP domain consists of an S-shaped arrangement of three helices. The domain forms a homodimer that binds two Arl1-GTPs using two helices from each monomer. The structure is consistent with golgin-245 forming parallel coiled-coils and suggests how Arl1-GTP/GRIP complexes interact with Golgi membranes via the N termini of Arl1-GTP and the C-terminal tails of the GRIP domains. In cells, bivalent association with Arl1-GTP would increase residence time of the golgins on Golgi membranes. Despite no conservation of sequence, topology, or even helical direction, several other effectors form similar interactions with small GTPases via a pair of alpha helices, suggesting a common structural basis for effector recognition. Structural basis for Arl1-dependent targeting of homodimeric GRIP domains to the Golgi apparatus.,Panic B, Perisic O, Veprintsev DB, Williams RL, Munro S Mol Cell. 2003 Oct;12(4):863-74. PMID:14580338[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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