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FOLD TYPE II PYRIDOXAL 5 `-PHOSPHATE DEPENDENT ENZYMES: STRUCTURE, SUBSTRATE RECOGNITION AND CATALYSIS

Bisht, S and Bharath, SR and Savithri, HS and Murthy, MRN (2013) FOLD TYPE II PYRIDOXAL 5 `-PHOSPHATE DEPENDENT ENZYMES: STRUCTURE, SUBSTRATE RECOGNITION AND CATALYSIS. In: Conference on Biomolecular Forms and Functions - A Celebration of 50 Years of the Ramachandran Map, JAN, 2013, Indian Inst Sci, Bangalore, INDIA, pp. 398-416.

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Official URL: http://dx.doi.org/10.1142/9789814449144_0031

Abstract

Enzymes utilizing pyridoxal 5'-phosphate dependent mechanism for catalysis are observed in all cellular forms of living organisms. PLP-dependent enzymes catalyze a wide variety of reactions involving amino acid substrates and their analogs. Structurally, these ubiquitous enzymes have been classified into four major fold types. We have carried out investigations on the structure and function of fold type I enzymes serine hydroxymethyl transferase and acetylornithine amino transferase, fold type n enzymes catabolic threonine deaminase, D-serine deaminase, D-cysteine desulfhydrase and diaminopropionate ammonia lyase. This review summarizes the major findings of investigations on fold type II enzymes in the context of similar studies on other PLP-dependent enzymes. Fold type II enzymes participate in pathways of both degradation and synthesis of amino acids. Polypeptide folds of these enzymes, features of their active sites, nature of interactions between the cofactor and the polypeptide, oligomeric structure, catalytic activities with various ligands, origin of specificity and plausible regulation of activity are briefly described. Analysis of the available crystal structures of fold type II enzymes revealed five different classes. The dimeric interfaces found in these enzymes vary across the classes and probably have functional significance.

Item Type: Conference Proceedings
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Additional Information: Copyright for this article belongs to the WORLD SCIENTIFIC PUBL CO PTE LTD, PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 14 Jul 2014 09:05
Last Modified: 14 Jul 2014 09:05
URI: http://eprints.iisc.ernet.in/id/eprint/49491

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