Mallika, V. and Sivakumar, K.C. and Aiswarya, G. and E.V. , Soniya (2019) In silico approaches illustrate the evolutionary pattern and protein-small molecule interactions of quinolone synthase from Aegle marmelos Correa. Journal of biomolecular structure & dynamics, 37 (1). 195-209 . ISSN 1538-0254

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Abstract

Quinolone synthase from Aegle marmelos (AmQNS) is a Rutacean-specific plant type III polyketide synthase that synthesizes quinolone, acridone, and benzalacetone with therapeutic potential. Simple architecture and broad substrate affinity of AmQNS make it as one of the target enzymes to produce novel structural scaffolds. Another unique feature of AmQNS despite its high similarity to acridone forming type III polyketide synthase from Citrus microcarpa is the variation in the product formation. Hence, to explore the characteristic features of AmQNS, an in-depth sequence and structure-based bioinformatics analyses were performed. Our studies indicated that AmQNS and its nearest homologs have evolved by a series of gene duplication events and strong purifying selection pressure constrains them in the evolutionary process. Additionally, some amino acid alterations were identified in the functionally important region(s), which can contribute to the functional divergence of the enzyme. Prediction of favorable amino acid substitutions will be advantageous in the metabolic engineering of AmQNS for the production of novel compounds. Furthermore, comparative modeling and docking studies were utilized to investigate the structural behavior and small molecule interaction pattern of AmQNS. The observations and results reported here are crucial for advancing our understanding of AmQNS's phylogenetic position, selection pressure, evolvability, interaction pattern and thus providing the foundation for further studies on the structural and reaction mechanism.

Item Type:	Article
Uncontrolled Keywords:	quinolone synthase, Aegle marmelos, AmQNS, type III PKS, evolutionary analysis, purifying selection
Subjects:	Plant Disease Biology & Biotechnology
Depositing User:	Central Library RGCB
Date Deposited:	15 Jul 2019 08:00
Last Modified:	15 Jul 2019 08:00
URI:	http://rgcb.sciencecentral.in/id/eprint/824

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