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Crystal structure of a phospholipase A(2) homolog complexed with p-bromophenacyl bromide reveals important structural changes associated with the inhibition of myotoxic activity
  • Universidade Estadual Paulista (UNESP)
  • Universidade de São Paulo (USP)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
  • Laboratório Nacional de Luz Síncrotron (LNLS)
For the first time, the structure of a catalytic inactive phospholipase A(2) homolog (Lys49-PLA(2)s) complexed with p-bromophenacyl bromide (BPB) has been solved by X-ray crystallography. Lys49-PLA(2)s are among the main components of Viperidae snake venoms, causing myonecrosis and other actions despite their catalytic inactivity. BPB, a classic inhibitor of catalytic-active PLA(2)s, has been used since the 1970s because it binds specifically the His48 residue of the catalytic site. Curiously, when Lys49-PLA(2) is chemically modified by BPB, it causes a partial inhibition of the myotoxic function which is associated with the C-terminus and not with the catalytic site. The structure of PrTX-I complexed to BPB revealed unambiguously that the inhibitor binds covalently to His48, causing a distortion of the Ca2+-binding loop region and C-terminus rearrangement in one of its monomers. The comparison between the apo and BPB-complexed PrTX-I structures showed an increased symmetry between the two monomers with the formation of an interchain hydrogen bond between Tyr119 residues. PrTX-I undergoes tertiary and quaternary structural changes when complexed to BPB which could be related to reduction of myotoxicity and other toxic activities. We also proposed a novel myotoxic inhibition hypothesis integrating "myotoxic" and "active" sites for bothropic Lys49-PLA(2)s. (C) 2009 Elsevier B.V. All rights reserved.
Issue Date: 
Biochimica Et Biophysica Acta-proteins and Proteomics. Amsterdam: Elsevier B.V., v. 1794, n. 11, p. 1583-1590, 2009.
Time Duration: 
Elsevier B.V.
  • Phospholipase A(2) homolog
  • Bothrops pirajai venom
  • Myotoxicity
  • p-Bromophenacyl bromide inhibitor
  • X-ray crystallography
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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