3ci4

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{{STRUCTURE_3ci4| PDB=3ci4 | SCENE= }}
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'''Structure of the PduO-type ATP:co(I)rrinoid adenosyltransferase from Lactobacillus reuteri complexed with four-coordinate cob(II)inamide and ATP'''
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===Structure of the PduO-type ATP:co(I)rrinoid adenosyltransferase from Lactobacillus reuteri complexed with four-coordinate cob(II)inamide and ATP===
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==Overview==
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ATP:cob(I)alamin adenosyltransferases (ACAs) catalyze the transfer of the 5'-deoxyadenosyl moiety from ATP to the upper axial ligand position of cobalamin in the synthesis of coenzyme B 12. For the ACA-catalyzed reaction to proceed, cob(II)alamin must be reduced to cob(I)alamin in the enzyme active site. This reduction is facilitated through the generation of a four-coordinate cob(II)alamin intermediate on the enzyme. We have determined the high-resolution crystal structure of a human-type ACA from Lactobacillus reuteri with a four-coordinate cob(II)alamin bound in the enzyme active site and with the product, adenosylcobalamin, partially occupied in the active site. The assembled structures represent snapshots of the steps in the ACA-catalyzed formation of the cobalt-carbon bond of coenzyme B 12. The structures define the corrinoid binding site and provide visual evidence for a base-off, four-coordinate cob(II)alamin intermediate. The complete structural description of ACA-mediated catalysis reveals the molecular features of four-coordinate cob(II)alamin stabilization and provides additional insights into the molecular basis for dysfunction in human patients suffering from methylmalonic aciduria.
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{{ABSTRACT_PUBMED_18452306}}
==About this Structure==
==About this Structure==
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[[Category: Atp binding]]
[[Category: Atp binding]]
[[Category: Corrin binding]]
[[Category: Corrin binding]]
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Revision as of 05:08, 29 July 2008

Image:3ci4.png

Template:STRUCTURE 3ci4

Structure of the PduO-type ATP:co(I)rrinoid adenosyltransferase from Lactobacillus reuteri complexed with four-coordinate cob(II)inamide and ATP

Template:ABSTRACT PUBMED 18452306

About this Structure

3CI4 is a Single protein structure of sequence from Lactobacillus reuteri. Full crystallographic information is available from OCA.

Reference

Structural characterization of a human-type corrinoid adenosyltransferase confirms that coenzyme B12 is synthesized through a four-coordinate intermediate., St Maurice M, Mera P, Park K, Brunold TC, Escalante-Semerena JC, Rayment I, Biochemistry. 2008 May 27;47(21):5755-66. Epub 2008 May 2. PMID:18452306

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