2a5g

Cholera toxin A1 subunit bound to ARF6(Q67L)

spinqualitylabelsall models 2a5g, resolution 2.66Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2a5g is a 2 chain structure with sequence from "bacillo_virgola_del_koch"_trevisan_1884 "bacillo virgola del koch" trevisan 1884 and Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GTP, MG, NA Gene: ARF6 (HUMAN), ctxA, toxA ("Bacillo virgola del Koch" Trevisan 1884) Activity: NAD(+)--diphthamide ADP-ribosyltransferase, with EC number 2.4.2.36 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [ARF6_HUMAN] GTP-binding protein involved in protein trafficking; regulates endocytic recycling and cytoskeleton remodeling. May modulate vesicle budding and uncoating within the Golgi apparatus. Functions as an allosteric activator of the cholera toxin catalytic subunit, an ADP-ribosyltransferase. Involved in the regulation of dendritic spine development (By similarity). Contributes to the regulation of dendritic branching and filopodia extension. [CHTA_VIBCH] The A1 chain catalyzes the ADP-ribosylation of Gs alpha, a GTP-binding regulatory protein, to activate the adenylate cyclase. This leads to an overproduction of cAMP and eventually to a hypersecretion of chloride and bicarbonate followed by water, resulting in the characteristic cholera stool. The A2 chain tethers A1 to the pentameric ring. 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 PubMed The Vibrio cholerae bacterium causes devastating diarrhea when it infects the human intestine. The key event is adenosine diphosphate (ADP)-ribosylation of the human signaling protein GSalpha, catalyzed by the cholera toxin A1 subunit (CTA1). This reaction is allosterically activated by human ADP-ribosylation factors (ARFs), a family of essential and ubiquitous G proteins. Crystal structures of a CTA1:ARF6-GTP (guanosine triphosphate) complex reveal that binding of the human activator elicits dramatic changes in CTA1 loop regions that allow nicotinamide adenine dinucleotide (NAD+) to bind to the active site. The extensive toxin:ARF-GTP interface surface mimics ARF-GTP recognition of normal cellular protein partners, which suggests that the toxin has evolved to exploit promiscuous binding properties of ARFs. Structural basis for the activation of cholera toxin by human ARF6-GTP.,O'Neal CJ, Jobling MG, Holmes RK, Hol WG Science. 2005 Aug 12;309(5737):1093-6. PMID:16099990 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cholera toxin User:David Solfiell/sandbox 1

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