title: Structure-function relationship of Chikungunya nsP2 protease: A comparative study with papain.
abstract: Chikungunya virus is a growing human pathogen transmitted by mosquito bite. It causes fever, chills, nausea, vomiting, joint pain, headache, and swelling in the joints. Its replication and propagation depend on the protease activity of the Chikungunya virus-nsP2 protein, which cleaves the nsP1234 polyprotein replication complex into individual functional units. The N-terminal segment of papain is structurally identical with the Chikungunya virus-nsP2 protease. Hence, molecular dynamics simulations were performed to compare molecular mechanism of these proteases. The Chikungunya virus-snP2 protease shows more conformational changes and adopts an alternate conformation. However, N-terminal segment of these two proteases has identical active site scaffold with the conserved catalytic diad. Hence, some of the non-peptide inhibitors of papain were used for induced fit docking at the active site of the nsP2 to assess the binding mode. In addition, the peptides that connect different domains/protein in Chikungunya virus poly-protein were also subjected for docking. The overall results suggest that the active site scaffold is the same in both the proteases and a possibility exists to experimentally assess the efficacy of some of the papain inhibitors to inhibit the Chikungunya virus-nsP2.
authors.affiliation: Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India.
authors.forename: Chandrasekaran
authors.initials: C
authors.lastname: Ramakrishnan
authors.affiliation: Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Chennai, India.
authors.forename: Nidamarthi H V
authors.initials: NHV
authors.lastname: Kutumbarao
authors.affiliation: Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Chennai, India.
authors.forename: Sivasubramanian
authors.initials: S
authors.lastname: Suhitha
authors.affiliation: Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Chennai, India.
authors.forename: Devadasan
authors.initials: D
authors.lastname: Velmurugan
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D020134:Catalytic Domain; D065632:Chikungunya Fever / Q000473:pathology / Q000821:virology; D002646:Chikungunya virus / Q000201:enzymology*; D003546:Cysteine Endopeptidases / Q000737:chemistry* / Q000378:metabolism; D015853:Cysteine Proteinase Inhibitors / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D062105:Molecular Docking Simulation; D056004:Molecular Dynamics Simulation; D008969:Molecular Sequence Data; D010206:Papain / Q000737:chemistry* / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D016415:Sequence Alignment; D013329:Structure-Activity Relationship; D013816:Thermodynamics; D014764:Viral Proteins / Q000737:chemistry* / Q000378:metabolism
chemical_list: D015853:Cysteine Proteinase Inhibitors; D014764:Viral Proteins; D003546:Cysteine Endopeptidases; D010206:Papain
keywords: Chikungunya virus; cysteine proteases; dynamic cross-correlation map; induced fit docking; molecular dynamics; non-structural protein 2; nsP2; papain