1nbu

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{{STRUCTURE_1nbu| PDB=1nbu | SCENE= }}
{{STRUCTURE_1nbu| PDB=1nbu | SCENE= }}
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'''7,8-Dihydroneopterin Aldolase Complexed with Product From Mycobacterium Tuberculosis'''
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===7,8-Dihydroneopterin Aldolase Complexed with Product From Mycobacterium Tuberculosis===
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==Overview==
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Folate derivatives are essential cofactors in the biosynthesis of purines, pyrimidines and amino acids across all forms of life. Mammals uptake folate from their diets, whereas most bacteria must synthesize folate de novo. Therefore, the enzymes in the folate biosynthetic pathway are attractive drug targets against bacterial pathogens such as Mycobacterium tuberculosis, the cause of the world's most deadly infectious disease, tuberculosis (TB). M.tuberculosis 7,8-dihydroneopterin aldolase (Mtb FolB, DHNA) is the second enzyme in the folate biosynthetic pathway, which catalyzes the conversion of 7,8-dihydroneopterin to 6-hydroxymethyl-7,8-dihydropterin and glycoaldehyde. The 1.6A X-ray crystal structure of Mtb FolB complexed with its product, 6-hydroxymethyl-7,8-dihydropterin, reveals an octameric assembly similar to that seen in crystal structures of other FolB homologs. However, the 2.5A crystal structure of unliganded Mtb FolB reveals a novel tetrameric oligomerization state, with only partially formed active sites. A substrate induced conformational change appears to be necessary to convert the inactive tetramer to the active octamer. Ultracentrifugation confirmed that in solution unliganded Mtb FolB is mainly tetrameric and upon addition of substrate FolB is predominantly octameric. Kinetic analysis of substrate binding gives a Hill coefficient of 2.0, indicating positive cooperativity. We hypothesize that Mtb FolB displays cooperativity in substrate binding to regulate the cellular concentration of 7,8-dihydroneopterin, so that it may function not only as a precursor to folate but also as an antioxidant for the survival of M.tuberculosis against host defenses.
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{{ABSTRACT_PUBMED_15876368}}
==About this Structure==
==About this Structure==
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[[Category: Tbsgc]]
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[[Category: Two alpha helice]]
[[Category: Two alpha helice]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 07:27:08 2008''

Revision as of 04:27, 28 July 2008

Image:1nbu.png

Template:STRUCTURE 1nbu

7,8-Dihydroneopterin Aldolase Complexed with Product From Mycobacterium Tuberculosis

Template:ABSTRACT PUBMED 15876368

About this Structure

1NBU is a Protein complex structure of sequences from Mycobacterium tuberculosis. Full crystallographic information is available from OCA.

Reference

Regulation by oligomerization in a mycobacterial folate biosynthetic enzyme., Goulding CW, Apostol MI, Sawaya MR, Phillips M, Parseghian A, Eisenberg D, J Mol Biol. 2005 May 27;349(1):61-72. Epub 2005 Apr 2. PMID:15876368

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