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From a metagenomic source to a high-resolution structure of a novel alkaline esterase

DOI: 10.1007/s00253-017-8226-4 DOI Help

Authors: Mariana Rangel Pereira (Brazilian Center for Research in Energy and Materials (CNPEM); University of São Paulo (USP); São Paulo State University (UNESP)) , Thaís Carvalho Maester (University of São Paulo (USP); São Paulo State University (UNESP)) , Gustavo Fernando Mercaldi (Brazilian Center for Research in Energy and Materials (CNPEM); University of Campinas) , Eliana Gertrudes De Macedo Lemos (São Paulo State University (UNESP)) , Marko Hyvonen (University of Cambridge) , Andrea Balan (University of São Paulo,)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Microbiology And Biotechnology , VOL 279

State: Published (Approved)
Published: March 2017
Diamond Proposal Number(s): 14043

Abstract: Esterases catalyze the cleavage and formation of ester bonds and are members of the diverse family of α/β hydrolase fold. They are useful in industries from different sectors, such as food, detergent, fine chemicals, and biofuel production. In a previous work, 30 positive clones for lipolytic activity were identified from a metagenomic library of a microbial consortium specialized in diesel oil degradation. In this study, a putative gene encoding an esterase/lipase, denominated est8, has been cloned and the corresponding protein expressed recombinantly, purified to homogeneity and characterized functional and structurally. We show that the protein codified by est8 gene, denominated Est8, is an alkaline esterase with high catalytic efficiency against p-nitrophenyl acetate and stable in the presence of up to 10% dimethyl sulfoxide. The three-dimensional structure of Est8 was determined at 1.85-Ǻ resolution, allowing the characterization of the substrate-binding pocket and features that rationalize the preference of Est8 for short-chain substrates. In an attempt to increase the size of ligand-binding pocket and enzyme activity against distinct substrates of long chain, we mutated two residues (Met213 and Phe217) that block the substrate channel. A small increase in the reaction velocity for p-nitrophenyl butyrate and p-nitrophenyl valerate hydrolysis was observed. Activity against p-nitrophenyl acetate was reduced. The functional and structural characterization of Est8 is explored in comparison with orthologues.

Journal Keywords: Esterase; Metagenomic Structure; Est8; p-NP esters

Diamond Keywords: Enzymes

Subject Areas: Biology and Bio-materials, Chemistry

Instruments: I02-Macromolecular Crystallography

Added On: 28/03/2017 10:06

Discipline Tags:

Biotechnology Biochemistry Catalysis Chemistry Structural biology Engineering & Technology Life Sciences & Biotech

Technical Tags:

Diffraction Macromolecular Crystallography (MX)