AUTHOR=Vilca-Quispe Augusto , Alvarez-Risco Aldo , Gomes Heleno Mauricio Aurelio , Ponce-Fuentes Emilio Alberto , Vera-Gonzales Corina , Zegarra-Aragon Herly Fredy Enrique , Aquino-Puma Juan Luis , Talavera-Núñez María Elena , Del-Aguila-Arcentales Shyla , Yáñez Jaime A. , Ponce-Soto Luis Alberto 

TITLE=Biochemical and hemostatic description of a thrombin-like enzyme TLBro from Bothrops roedingeri snake venom

JOURNAL=Frontiers in Chemistry

VOLUME=11

YEAR=2023

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1217329

DOI=10.3389/fchem.2023.1217329

ISSN=2296-2646

ABSTRACT=<p><bold>Objective:</bold> The current study’s objective is to characterize a new throm-bin-like enzyme called TLBro that was obtained from <italic>Bothrops roedingeris</italic> snake from a biochemical and hemostatic perspective.</p><p><bold>Methodology:</bold> One chromatographic step was used to purify it, producing the serine protease TLBro. Molecular mass was estimated by SDS-PAGE to be between reduced and unreduced by 35 kDa. Tryptic peptide sequencing using Swiss Prot provided the complete amino acid sequence. Expasy.org by conducting a search that is limited to Crotalinae snake serine proteases and displaying a high degree of amino acid sequence.</p><p><bold>Results:</bold> Ser (182) is inhibited by phenylmethylsulfonyl fluoride (PMSF), and TLBro demonstrated the presence of Asp (88) residues. It also deduced the positions of His (43) and Ser (182) in the set of three coordinated amino acids in serine proteases. It was discovered that this substrate had high specificity for BANA, Michaelis-Menten behavior with KM 0 point85 mM and Vmax 1 point89 nmoles -NA/L/min, and high stability between temperatures (15 to 70°C) and pHs (2 point0 to 10 point0). According to doses and incubation times, TLBro degraded fibrin preferentially on the B-chain; additionally, its activities were significantly diminished after preincubation with divalent ions (Zn<sub>2</sub> and Cd<sub>2</sub>). When incubated with PMSF, a particular serine protease inhibitor, enzymatic activities and platelet aggregation were inhibited.</p><p><bold>Conclusion:</bold> The findings revealed distinct structural and functional differences between the serine proteases, adding to the information and assisting in the improvement of the structure-function relationship.</p>