Small Cationic Protein From a Marine Turtle Has �- Defensin-Like Fold and Antibacterial and Antiviral Activity

Chattopadhyay, Suranjana and Sinha, Nirmal Kumar and Banerjee, Shuvojit and Roy, Debjani and Chattopadhyay, Dhrubajyoti and Roy, Siddhartha (2006) Small Cationic Protein From a Marine Turtle Has �- Defensin-Like Fold and Antibacterial and Antiviral Activity. "Proteins: Structure, Function, and Bioinformatics", 64 (2). pp. 524-531.

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    Abstract

    Egg white of marine turtle Caretta caretta contains a small cationic protein but lacks lysozyme. The protein was sequenced by a combination of sequential Edman degradation, carboxypeptidase digestion, nuclear magnetic resonance (NMR) and electrospray ionization tandem mass spectrometry. The protein contains 36 amino acid residues of which six are half-cysteines. The three-dimensional structure of the protein was deduced from twodimensional NMR experiments and was observed to be similar to vertebrate �-defensins. However, disulfide connectivity is C1–C6/C2–C5/C3–C4; different from that of the vertebrate �-defensins. The protein showed strong antibacterial activity against Escherichia coli and Salmonella typhimurium. The protein also showed significant antiviral activity against an enveloped rhabdovirus, Chandipura virus, which is an emerging human pathogen. This virus is also closely related to the vesicular stomatitis virus, whose growth was also inhibited. This small cationic protein is part of the innate immunity of this organism and replaces lysozyme in the egg. It has the potential to be developed as an antibacterial and antiviral agent. Proteins 2006;64:524–531.

    Item Type: Article
    URI: http://www.eprints.iicb.res.in/id/eprint/485
    Subjects: Structural Biology & Bioinformatics
    Divisions: Indian Institute of Chemical Biology
    Depositing User: Ms Sutapa Ganguly
    Date Deposited: 02 Nov 2011 12:48
    Last Modified: 08 Jul 2015 13:02
    Official URL: http://dx.doi.org/10.1002/prot.20963
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