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[[Image:1pix.jpg|left|200px]]
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[[Image:1pix.png|left|200px]]


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{{STRUCTURE_1pix|  PDB=1pix  |  SCENE=  }}  
{{STRUCTURE_1pix|  PDB=1pix  |  SCENE=  }}  


'''Crystal structure of the carboxyltransferase subunit of the bacterial ion pump glutaconyl-coenzyme A decarboxylase'''
===Crystal structure of the carboxyltransferase subunit of the bacterial ion pump glutaconyl-coenzyme A decarboxylase===




==Overview==
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Glutaconyl-CoA decarboxylase is a biotin-dependent ion pump whereby the free energy of the glutaconyl-CoA decarboxylation to crotonyl-CoA drives the electrogenic transport of sodium ions from the cytoplasm into the periplasm. Here we present the crystal structure of the decarboxylase subunit (Gcdalpha) from Acidaminococcus fermentans and its complex with glutaconyl-CoA. The active sites of the dimeric Gcdalpha lie at the two interfaces between the mono mers, whereas the N-terminal domain provides the glutaconyl-CoA-binding site and the C-terminal domain binds the biotinyllysine moiety. The Gcdalpha catalyses the transfer of carbon dioxide from glutaconyl-CoA to a biotin carrier (Gcdgamma) that subsequently is decarboxylated by the carboxybiotin decarboxylation site within the actual Na(+) pump (Gcdbeta). The analysis of the active site lead to a novel mechanism for the biotin-dependent carboxy transfer whereby biotin acts as general acid. Furthermore, we propose a holoenzyme assembly in which the water-filled central channel of the Gcdalpha dimer lies co-axial with the ion channel (Gcdbeta). The central channel is blocked by arginines against passage of sodium ions which might enter the central channel through two side channels.
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{{ABSTRACT_PUBMED_12853465}}


==About this Structure==
==About this Structure==
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[[Category: Carboxyltransferase]]
[[Category: Carboxyltransferase]]
[[Category: Decarboxylase]]
[[Category: Decarboxylase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 05:08:00 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 07:12:04 2008''

Revision as of 04:12, 28 July 2008

File:1pix.png

Template:STRUCTURE 1pix

Crystal structure of the carboxyltransferase subunit of the bacterial ion pump glutaconyl-coenzyme A decarboxylase

Template:ABSTRACT PUBMED 12853465

About this Structure

1PIX is a Single protein structure of sequence from Acidaminococcus fermentans. Full crystallographic information is available from OCA.

Reference

Crystal structure of the carboxyltransferase subunit of the bacterial sodium ion pump glutaconyl-coenzyme A decarboxylase., Wendt KS, Schall I, Huber R, Buckel W, Jacob U, EMBO J. 2003 Jul 15;22(14):3493-502. PMID:12853465

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