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Petrenko DE, Mikhailova AG, Timofeev VI, Agapova YК, Karlinsky DM, Komolov AS, Korzhenevskiy DA, Vlaskina AV, Rumsh LD, Rakitina TV. Molecular dynamics complemented by site-directed mutagenesis reveals significant difference between the interdomain salt bridge networks stabilizing oligopeptidases B from bacteria and protozoa in their active conformations. J Biomol Struct Dyn 2019; 38:4868-4882. [PMID: 31724904 DOI: 10.1080/07391102.2019.1692694] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Oligopeptidases B (OpdBs) are trypsin-like peptidases from protozoa and bacteria that belong to the prolyl oligopeptidase (POP) family. All POPs consist of C-terminal catalytic domain and N-terminal β-propeller domain and exist in two major conformations: closed (active), where the domains and residues of the catalytic triad are positioned close to each other, and open (non-active), where two domains and residues of the catalytic triad are separated. The interdomain interface, particularly, one of its salt bridges (SB1), plays a role in the transition between these two conformations. However, due to double amino acid substitution (E/R and R/Q), this functionally important SB1 is absent in γ-proteobacterial OpdBs including peptidase from Serratia proteamaculans (PSP). In this study, molecular dynamics was used to analyze inter- and intradomain interactions stabilizing PSP in the closed conformation, in which catalytic H652 is located close to other residues of the catalytic triad. The 3D models of either wild-type PSP or of mutant PSPs carrying activating mutations E125A and D649A in complexes with peptide-substrates were subjected to the analysis. The mechanism that regulates transition of H652 from active to non-active conformation upon domain separation in PSP and other γ-proteobacterial OpdB was proposed. The complex network of polar interactions within H652-loop/C-terminal α-helix and between these areas and β-propeller domain, established in silico, was in a good agreement with both previously published results on the effects of single-residue mutations and new data on the effects of the activating mutations on each other and on the low active mutant PSP-K655A.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Dmitry E Petrenko
- National Research Center "Kurchatov Institute", Moscow, Russian Federation
| | - Anna G Mikhailova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
| | - Vladimir I Timofeev
- National Research Center "Kurchatov Institute", Moscow, Russian Federation.,Shubnikov Institute of Crystallography of Federal Scientific Research Centre "Crystallography and Photonics", Russian Academy of Sciences, Moscow, Russian Federation
| | - Yulia К Agapova
- National Research Center "Kurchatov Institute", Moscow, Russian Federation
| | - David M Karlinsky
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
| | - Aleksandr S Komolov
- National Research Center "Kurchatov Institute", Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region, Russian Federation
| | | | - Anna V Vlaskina
- National Research Center "Kurchatov Institute", Moscow, Russian Federation
| | - Lev D Rumsh
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
| | - Tatiana V Rakitina
- National Research Center "Kurchatov Institute", Moscow, Russian Federation.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
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