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The Protein Journal

, Volume 23, Issue 4, pp 273–285 | Cite as

Cloning and Identification of a Complete cDNA Coding for a Bactericidal and Antitumoral Acidic Phospholipase A2 from Bothrops jararacussu Venom

  • Patrícia G. Roberto
  • Simone Kashima
  • Silvana Marcussi
  • José O. Pereira
  • Spartaco Astolfi-Filho
  • Auro Nomizo
  • José R. Giglio
  • Marcos R.M. Fontes
  • Andreimar M. Soares
  • Suzelei C. França
Article

Abstract

In order to better understand the function of acidic phospholipases A2 (PLA2s) from snake venoms, expressed sequence tags (ESTs) that code for acidic PLA2s were isolated from a cDNA library prepared from the poly(A)+ RNA of venomous glands of Bothrops jararacussu. The complete nucleotide sequence (366 bp), named BOJU-III, encodes the BthA-I-PLA2 precursor, which includes a signal peptide and the mature protein with 16 and 122 amino acid residues, respectively. Multiple comparison of both the nucleotide and respective deduced amino acid sequence with EST and protein sequences from databases revealed that the full-length cDNA identified (BOJU III – AY145836) is related to an acidic PLA2 sharing similarity, within the range 55–81%, with acidic phospholipases from snake venoms. Moreover, phylogenetic analysis of amino acid sequences of acidic PLA2s from several pit viper genera showed close evolutionary relationships among acidic PLA2s from Bothrops, Crotalus, and Trimeresurus. The molecular modeling showed structural similarity with other dimeric class II PLA2s from snake venoms. The native protein BthA-I-PLA2, a nontoxic acidic PLA2 directly isolated from Bothrops jararacussu snake venom, was purified and submitted to various bioassays. BthA-I-PLA2 displayed high catalytic activity and induced Ca2+-dependent liposome disruption. Edema induced by this PLA2 was inhibited by indomethacin and dexamethasone, thus suggesting involvement of the cyclo-oxygenase pathway. BthA-I-PLA2 showed anticoagulant activity upon human plasma and inhibited phospholipid-dependent platelet aggregation induced by collagen or ADP. In addition, it displayed bactericidal activity against Escherichia coli and Staphylococcus aureus and antitumoral effect upon breast adrenocarcinoma as well as upon human leukemia T and Erlich ascitic tumor. Following chemical modification with p-bromophenacyl bromide, total loss of the enzymatic and pharmacological activities were observed. This is the first report on the isolation and identification of a cDNA encoding a complete acidic PLA2 from Bothrops venom, exhibiting bactericidal and antitumoral effects.

Acidic phospholipases A2 antitumoral effect bactericidal Bothrops jararacussu BPB-chemical modification cDNA structural analysis 

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Copyright information

© Plenum Publishing Corporation 2004

Authors and Affiliations

  • Patrícia G. Roberto
    • 1
  • Simone Kashima
    • 1
  • Silvana Marcussi
    • 1
  • José O. Pereira
    • 2
  • Spartaco Astolfi-Filho
    • 2
  • Auro Nomizo
    • 3
  • José R. Giglio
    • 4
  • Marcos R.M. Fontes
    • 5
  • Andreimar M. Soares
    • 1
  • Suzelei C. França
    • 1
  1. 1.Unidade de BiotecnologiaUniversidade de Ribeirão Preto, UNAERPRibeirão Preto-SPBrazil
  2. 2.Faculdade de Ciências AgráriasUniversidade Federal do AmazonasManaus-AMBrazil
  3. 3.Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, FCFRPUniversidade de São PauloRibeirão Preto-SPBrazil
  4. 4.Departamento de Bioquímica e Imunologia, FMRPUniversidade de São PauloRibeirão Preto-SPBrazil
  5. 5.Departamento de Física e Biofísica, IBUniversidade Estadual PaulistaBotucatu-SPBrazil

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