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Analysis of the structure and substrate binding of Phormidium lapideum alanine dehydrogenase

Abstract

The structure of the hexameric L-alanine dehydrogenase from Phormidium lapideum reveals that the subunit is constructed from two domains, each having the common dinucleotide binding fold. Despite there being no sequence similarity, the fold of alanine dehydrogenase is closely related to that of the family of D-2-hydroxyacid dehydrogenases, with a similar location of the active site, suggesting that these enzymes are related by divergent evolution. L-alanine dehydrogenase and the 2-hydroxyacid dehydrogenases also use equivalent functional groups to promote substrate recognition and catalysis. However, they are arranged differently on the enzyme surface, which has the effect of directing opposite faces of the keto acid to the dinucleotide in each case, forcing a change in absolute configuration of the product.

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Figure 1: Assembly of the hexamer of AlaDH.
Figure 2: The aligned amino acid sequences of the AlaDHs from P. lapideum (Pla), B. stearothermophilus (Bst), M. tuberculosis (Mct), B. sphaericus (Bsp) and B. subtilis (Bsu).
Figure 3: a, The superposition of the structures of the binary complex of AlaDH with NAD+ (green) and the free enzyme (blue) showing the movement of the 238–246, the 266–271 and the 296–299 loops, which occurs on dinucleotide binding.
Figure 4: a, Close ups of the active sites of L-AlaDH, b, L-lactate dehydrogenase (1LDM) and c, D-2-hydroxyisocaproate dehydrogenase (1DXY).

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Acknowledgements

We thank the BBSRC, The New Energy and Industrial Development Organization, The Wellcome Trust and the British Council/ The Royal Society Anglo-Japanese Scientific Exchange Scheme for financial help. The Krebs Institute is a BBSRC designated Biomolecular Sciences center and a member of the North of England Structural Biology Centre.

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Correspondence to Patrick J. Baker.

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Baker, P., Sawa, Y., Shibata, H. et al. Analysis of the structure and substrate binding of Phormidium lapideum alanine dehydrogenase. Nat Struct Mol Biol 5, 561–567 (1998). https://doi.org/10.1038/817

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