The first crystal structure of NAD-dependent 3-dehydro-2-deoxy-d-gluconate dehydrogenase from Thermus thermophilus HB8

Pampa, K. J. and Lokanath, N. K. and Kunishima, N. and Ravishankar Rai, V. (2014) The first crystal structure of NAD-dependent 3-dehydro-2-deoxy-d-gluconate dehydrogenase from Thermus thermophilus HB8. Acta Crystallographica Section D: Biological Crystallography, 70 (4). pp. 994-1004. ISSN 1399-0047

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Abstract

2-Keto-3-deoxygluconate (KDG) is one of the important intermediates in pectin metabolism. An enzyme involved in this pathway, 3-dehydro-3-deoxy-d- gluconate 5-dehydrogenase (DDGDH), has been identified which converts 2,5-diketo-3-deoxygluconate to KDG. The enzyme is a member of the short-chain dehydrogenase (SDR) family. To gain insight into the function of this enzyme at the molecular level, the first crystal structure of DDGDH from Thermus thermophilus HB8 has been determined in the apo form, as well as in complexes with the cofactor and with citrate, by X-ray diffraction methods. The crystal structures reveal a tight tetrameric oligomerization. The secondary-structural elements and catalytically important residues of the enzyme were highly conserved amongst the proteins of the NAD(P)-dependent SDR family. The DDGDH protomer contains a dinucleotide-binding fold which binds the coenzyme NAD + in an intersubunit cleft; hence, the observed oligomeric state might be important for the catalytic function. This enzyme prefers NAD(H) rather than NADP(H) as the physiological cofactor. A structural comparison of DDGDH with mouse lung carbonyl reductase suggests that a significant difference in the α-loop-α region of this enzyme is associated with the coenzyme specificity. The structural data allow a detailed understanding of the functional role of the conserved catalytic triad (Ser129-Tyr144-Lys148) in cofactor and substrate recognition, thus providing substantial insights into DDGDH catalysis. From analysis of the three-dimensional structure, intersubunit hydrophobic interactions were found to be important for enzyme oligomerization and thermostability.

Item Type:	Article
Uncontrolled Keywords:	chemical structure, chemistry, metabolism, enzymology, amino acid sequence, Amino Acid Sequence, sequence alignment, Sequence Alignment, Models, Protein, Molecular, enzyme specificity, Substrate Specificity, Molecular Sequence Data, oxidoreductase, molecular genetics, Protein Structure, protein tertiary structure, Tertiary, NAD, nicotinamide adenine dinucleotide, structural homology, Thermus thermophilus, Oxidoreductases, protein quaternary structure, Quaternary, Structural Homology
Subjects:	B Life Science > Microbiology D Physical Science > Physics
Divisions:	Department of > Physics Department of > Microbiology
Depositing User:	Arshiya Kousar Library Assistant
Date Deposited:	30 Aug 2019 07:56
Last Modified:	30 Aug 2019 07:56
URI:	http://eprints.uni-mysore.ac.in/id/eprint/4314

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