Crystal structures of BnSP-7 and BnSP-6, two Lys49-phospholipases A(2): quaternary structure and inhibition mechanism insights.Magro, A.J., Soares, A.M., Giglio, J.R., Fontes, M.R.
(2003) Biochem.Biophys.Res.Commun. 311: 713-720
- PubMed: 14623331
- Primary Citation of Related Structures:
- PubMed Abstract:
- Crystallization and preliminary X-ray diffraction analysis of a myotoxic phospholipase A2 homologue from Bothrops neuwiedi pauloensis venom
Fontes, M.R.,Soares, A.M.,Rodrigues, V.M.,Fernandes, A.C.,Da Silva, R.J.,Giglio, J.R.
(1999) Biochim.Biophys.Acta 1432: 393
- Structural and Function Characterization of BnSP-7, a Lys49 Myotoxic Phospholipase A2 Homologue from Bothrops neuwiedi Venom
Soares, A.M.,Guerra-Sa, R.,Borja-Oliveira, C.R.,Rodrigues, V.M.,Rodrigues-Simioni, L.,Rodrigues, V.,Fontes, M.R.,Lomonte, B.,Gutirrez, J.M.,Giglio, J.R.
(2000) Arch.Biochem.Biophys. 378: 201
Phospholipases A(2) are components of Bothrops venoms responsible for disruption of cell membrane integrity via hydrolysis of its phospholipids. A class of PLA(2)-like proteins has been described which despite PLA(2) activity on artificial substrate, ...
Phospholipases A(2) are components of Bothrops venoms responsible for disruption of cell membrane integrity via hydrolysis of its phospholipids. A class of PLA(2)-like proteins has been described which despite PLA(2) activity on artificial substrate, due to a D49K mutation, is still highly myonecrotic. This work reports the X-ray structure determination of two Lys49-PLA(2)s from Bothrops neuwiedi pauloensis (BnSP-7 and BnSP-6) and, for the first time, the comparison of eight dimeric Lys49-PLA(2)s. This comparison reveals that there are not just two ("open" and "closed") but at least six different conformations. The binding of fatty acid observed in three recent Lys49-PLA(2) structures seems to be independent of their quaternary conformation. Cys29 polarization by Lys122 is not significant for BnSP-7 and BnSP-6 or other structures not bound by fatty acids. These structures may be in an "active" state when nothing is bound to them and the Lys122/Cys29 interactions are weak or absent.
Departamento de Física e Biofísica, IB, UNESP, Botucatu-SP, Brazil.