2cbf
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(New page: 200px<br /> <applet load="2cbf" size="450" color="white" frame="true" align="right" spinBox="true" caption="2cbf, resolution 3.1Å" /> '''THE X-RAY STRUCTURE ...)
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Revision as of 19:20, 29 October 2007
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THE X-RAY STRUCTURE OF A COBALAMIN BIOSYNTHETIC ENZYME, COBALT PRECORRIN-4 METHYLTRANSFERASE, CBIF, FROM BACILLUS MEGATERIUM, WITH THE HIS-TAG CLEAVED OFF
Overview
Biosynthesis of the corrin ring of vitamin B12 requires the action of six, S-adenosyl-L-methionine (AdoMet) dependent transmethylases, closely, related in sequence. The first X-ray structure of one of these, cobalt-precorrin-4 transmethylase, CbiF, from Bacillus megaterium has been, determined to a resolution of 2.4 A. CbiF contains two alphabeta domains, forming a trough in which S-adenosyl-L-homocysteine (AdoHcy) binds. The, location of AdoHcy and a number of conserved residues, helps define the, precorrin binding site. A second crystal form determined at 3.1 A, resolution highlights the flexibility of two loops around this site. CbiF, employs a unique mode of AdoHcy binding and represents a new class of, transmethylase.
About this Structure
2CBF is a [Single protein] structure of sequence from [Bacillus megaterium] with SAH as [ligand]. Active as [[1]], with EC number [2.1.1.133]. Full crystallographic information is available from [OCA].
Reference
The X-ray structure of a cobalamin biosynthetic enzyme, cobalt-precorrin-4 methyltransferase., Schubert HL, Wilson KS, Raux E, Woodcock SC, Warren MJ, Nat Struct Biol. 1998 Jul;5(7):585-92. PMID:9665173
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