2a5g: Difference between revisions
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New page: left|200px<br /> <applet load="2a5g" size="450" color="white" frame="true" align="right" spinBox="true" caption="2a5g, resolution 2.66Å" /> '''Cholera toxin A1 su... |
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[[Image:2a5g.gif|left|200px]]<br /> | [[Image:2a5g.gif|left|200px]]<br /><applet load="2a5g" size="350" color="white" frame="true" align="right" spinBox="true" | ||
<applet load="2a5g" size=" | |||
caption="2a5g, resolution 2.66Å" /> | caption="2a5g, resolution 2.66Å" /> | ||
'''Cholera toxin A1 subunit bound to ARF6(Q67L)'''<br /> | '''Cholera toxin A1 subunit bound to ARF6(Q67L)'''<br /> | ||
==Overview== | ==Overview== | ||
The Vibrio cholerae bacterium causes devastating diarrhea when it infects | 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== | ==About this Structure== | ||
2A5G is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Vibrio_cholerae Vibrio cholerae] with MG, NA and GTP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http:// | 2A5G is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Vibrio_cholerae Vibrio cholerae] with <scene name='pdbligand=MG:'>MG</scene>, <scene name='pdbligand=NA:'>NA</scene> and <scene name='pdbligand=GTP:'>GTP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A5G OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Vibrio cholerae]] | [[Category: Vibrio cholerae]] | ||
[[Category: Hol, W | [[Category: Hol, W G.J.]] | ||
[[Category: Holmes, R | [[Category: Holmes, R K.]] | ||
[[Category: Jobling, M | [[Category: Jobling, M G.]] | ||
[[Category: Neal, C | [[Category: Neal, C J.O.]] | ||
[[Category: GTP]] | [[Category: GTP]] | ||
[[Category: MG]] | [[Category: MG]] | ||
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[[Category: protein transport/transferase]] | [[Category: protein transport/transferase]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:23:46 2008'' | ||
