Download MendeleyCrystal 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.M.(2003) Biochem Biophys Res Commun 311: 713-720
- PubMed: 14623331
- DOI: https://doi.org/10.1016/j.bbrc.2003.10.047
- Primary Citation of Related Structures:
1PA0, 1PC9 - PubMed Abstract:
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.
Organizational Affiliation:
Departamento de Física e Biofísica, IB, UNESP, Botucatu-SP, Brazil.
