1pt9: Difference between revisions

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Crystal Structure Analysis of the DIII Component of Transhydrogenase with a Thio-Nicotinamide Nucleotide Analogue

OverviewOverview

Transhydrogenase couples the reduction of NADP+ by NADH to inward proton translocation across mitochondrial and bacterial membranes. The coupling reactions occur within the protein by long distance conformational changes. In intact transhydrogenase and in complexes formed from the isolated, nucleotide-binding components, thio-NADP(H) is a good analogue for NADP(H), but thio-NAD(H) is a poor analogue for NAD(H). Crystal structures of the nucleotide-binding components show that the twists of the 3-carbothiamide groups of thio-NADP+ and of thio-NAD+ (relative to the planes of the pyridine rings), which are defined by the dihedral, Xam, are altered relative to the twists of the 3-carboxamide groups of the physiological nucleotides. The finding that thio-NADP+ is a good substrate despite an increased Xam value shows that approach of the NADH prior to hydride transfer is not obstructed by the S atom in the analogue. That thio-NAD(H) is a poor substrate appears to be the result of failure in the conformational change that establishes the ground state for hydride transfer. This might be a consequence of restricted rotation of the 3-carbothiamide group during the conformational change.

About this StructureAbout this Structure

1PT9 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

ReferenceReference

Interactions between transhydrogenase and thio-nicotinamide Analogues of NAD(H) and NADP(H) underline the importance of nucleotide conformational changes in coupling to proton translocation., Singh A, Venning JD, Quirk PG, van Boxel GI, Rodrigues DJ, White SA, Jackson JB, J Biol Chem. 2003 Aug 29;278(35):33208-16. Epub 2003 Jun 5. PMID:12791694 Page seeded by OCA on Sat May 3 05:27:52 2008

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OCA

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 [[Image:1pt9.jpg|left|200px]]
- {{Structure
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-|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/NAD(P)(+)_transhydrogenase_(AB-specific) NAD(P)(+) transhydrogenase (AB-specific)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.6.1.2 1.6.1.2] </span>
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-}}
 '''Crystal Structure Analysis of the DIII Component of Transhydrogenase with a Thio-Nicotinamide Nucleotide Analogue'''
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 Interactions between transhydrogenase and thio-nicotinamide Analogues of NAD(H) and NADP(H) underline the importance of nucleotide conformational changes in coupling to proton translocation., Singh A, Venning JD, Quirk PG, van Boxel GI, Rodrigues DJ, White SA, Jackson JB, J Biol Chem. 2003 Aug 29;278(35):33208-16. Epub 2003 Jun 5. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12791694 12791694]
 [[Category: Homo sapiens]]
-[[Category: NAD(P)(+) transhydrogenase (AB-specific)]]
 [[Category: Single protein]]
 [[Category: Boxel, G I.van.]]
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 [[Category: Venning, J D.]]
 [[Category: White, S A.]]
-[[Category: mitochondria]]
+[[Category: Mitochondria]]
-[[Category: proton translocation]]
+[[Category: Proton translocation]]
-[[Category: thio-nicotinamide]]
+[[Category: Thio-nicotinamide]]
-[[Category: transhydrogenase]]
+[[Category: Transhydrogenase]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 05:27:52 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:04:15 2008''