Journal
FRONTIERS IN CHEMISTRY
Volume 10, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2022.978668
Keywords
amino acid modification; chymotrypsin; formalin; cross-linking; spectroscopy; molecular docking
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Funding
- Indian National Academy of Engineering (INAE) [INAE/121/AKF]
- Umm Al-Qura University [22UQU4320545DSR22]
- United Arab Emirates University (UAEU) of Al-Ain and the Research Office [G00003291]
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This study investigates the effect of formalin on the enzyme alpha-chymotrypsin (CHT) and reveals the role of amino acid residue modifications in the enzyme's catalytic activity and molecular recognition. The results show that the presence of formalin reduces the enzyme's catalytic activity and leads to the formation of multiple binding sites in the enzyme.
Enzyme function can be altered via modification of its amino acid residues, side chains and large-scale domain modifications. Herein, we have addressed the role of residue modification in catalytic activity and molecular recognition of an enzyme alpha-chymotrypsin (CHT) in presence of a covalent cross-linker formalin. Enzyme assay reveals reduced catalytic activity upon increased formalin concentration. Polarization gated anisotropy studies of a fluorophore 8-Anilino-1-naphthalenesulfonic acid (ANS) in CHT show a dip rise pattern in presence of formalin which is consistent with the generation of multiple ANS binding sites in the enzyme owing to modifications of its local amino acid residues. Molecular docking study on amino acid residue modifications in CHT also indicate towards the formation of multiple ANS binding site. The docking model also predicted no change in binding behavior for the substrate Ala-Ala-Phe-7-amido-4-methylcoumarin (AMC) at the active site upon formalin induced amino acid cross-linking.
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