2a5g
From Proteopedia
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|PDB= 2a5g |SIZE=350|CAPTION= <scene name='initialview01'>2a5g</scene>, resolution 2.66Å | |PDB= 2a5g |SIZE=350|CAPTION= <scene name='initialview01'>2a5g</scene>, resolution 2.66Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene> and <scene name='pdbligand=GTP:GUANOSINE-5 | + | |LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene> and <scene name='pdbligand=GTP:GUANOSINE-5'-TRIPHOSPHATE'>GTP</scene> |
|ACTIVITY= [http://en.wikipedia.org/wiki/NAD(+)--diphthamide_ADP-ribosyltransferase NAD(+)--diphthamide ADP-ribosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.36 2.4.2.36] | |ACTIVITY= [http://en.wikipedia.org/wiki/NAD(+)--diphthamide_ADP-ribosyltransferase NAD(+)--diphthamide ADP-ribosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.36 2.4.2.36] | ||
|GENE= ARF6 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), ctxA, toxA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=666 Vibrio cholerae]) | |GENE= ARF6 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), ctxA, toxA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=666 Vibrio cholerae]) | ||
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[[Category: protein transport/transferase]] | [[Category: protein transport/transferase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 23 14:34:48 2008'' |
Revision as of 12:34, 23 March 2008
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| , resolution 2.66Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , and | ||||||
| Gene: | ARF6 (Homo sapiens), ctxA, toxA (Vibrio cholerae) | ||||||
| Activity: | NAD(+)--diphthamide ADP-ribosyltransferase, with EC number 2.4.2.36 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Cholera toxin A1 subunit bound to ARF6(Q67L)
Overview
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.
About this Structure
2A5G is a Protein complex structure of sequences from Homo sapiens and Vibrio cholerae. Full crystallographic information is available from OCA.
Reference
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
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