2isk: Difference between revisions

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[[Image:2isk.gif|left|200px]]
{{Seed}}
[[Image:2isk.png|left|200px]]


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{{STRUCTURE_2isk|  PDB=2isk  |  SCENE=  }}  
{{STRUCTURE_2isk|  PDB=2isk  |  SCENE=  }}  


'''BluB bound to flavin anion (charge transfer complex)'''
===BluB bound to flavin anion (charge transfer complex)===


==Overview==
An insight into a previously unknown step in B(12) biosynthesis was unexpectedly obtained through our analysis of a mutant of the symbiotic nitrogen fixing bacterium Sinorhizobium meliloti. This mutant was identified based on its unusually bright fluorescence on plates containing the succinoglycan binding dye calcofluor. The mutant contains a Tn5 insertion in a gene that has not been characterized previously in S. meliloti. The closest known homolog is the bluB gene of Rhodobacter capsulatus, which is implicated in the biosynthesis of B(12) (cobalamin). The S. meliloti bluB mutant is unable to grow in minimal media and fails to establish a symbiosis with alfalfa, and these defects can be rescued by the addition of vitamin B(12) (cyanocobalamin) or the lower ligand of cobalamin, 5,6-dimethylbenzimidazole (DMB). Biochemical analysis demonstrated that the bluB mutant does not produce cobalamin unless DMB is supplied. Sequence comparison suggests that BluB is a member of the NADH/flavin mononucleotide (FMN)-dependent nitroreductase family, and we propose that it is involved in the conversion of FMN to DMB.


==About this Structure==
==About this Structure==
2ISK is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Sinorhizobium_meliloti Sinorhizobium meliloti]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ISK OCA].  
2ISK is a 8 chains structure of sequences from [http://en.wikipedia.org/wiki/Sinorhizobium_meliloti Sinorhizobium meliloti]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ISK OCA].  


==Reference==
==Reference==
Sinorhizobium meliloti bluB is necessary for production of 5,6-dimethylbenzimidazole, the lower ligand of B12., Campbell GR, Taga ME, Mistry K, Lloret J, Anderson PJ, Roth JR, Walker GC, Proc Natl Acad Sci U S A. 2006 Mar 21;103(12):4634-9. Epub 2006 Mar 1. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16537439 16537439]
<ref group="xtra">PMID:16537439</ref><references group="xtra"/>
[[Category: Single protein]]
[[Category: Sinorhizobium meliloti]]
[[Category: Sinorhizobium meliloti]]
[[Category: Howard-Jones, A R.]]
[[Category: Howard-Jones, A R.]]
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[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
[[Category: Vitamin b12]]
[[Category: Vitamin b12]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Feb 17 10:23:05 2009''

Revision as of 08:23, 17 February 2009

File:2isk.png

Template:STRUCTURE 2isk

BluB bound to flavin anion (charge transfer complex)

About this Structure

2ISK is a 8 chains structure of sequences from Sinorhizobium meliloti. Full crystallographic information is available from OCA.

Reference

  1. Campbell GR, Taga ME, Mistry K, Lloret J, Anderson PJ, Roth JR, Walker GC. Sinorhizobium meliloti bluB is necessary for production of 5,6-dimethylbenzimidazole, the lower ligand of B12. Proc Natl Acad Sci U S A. 2006 Mar 21;103(12):4634-9. Epub 2006 Mar 1. PMID:16537439

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