Structural insights for fatty acid binding in a Lys49 phospholipase A2: crystal structure of myotoxin II from Bothrops moojeni complexed with stearic acid
Structural insights for fatty acid binding in a Lys49-phospholipase A(2): crystal structure of myotoxin II from Bothrops moojeni complexed with stearic acid
The crystal structure of dimeric Lys49-phospholipase A2 myotoxin-II from Bothrops moojeni (MjTX-II) co-crystallized with stearic acid (C(18)H(36)O(2)) has been determined at a resolution of 1.8 A. The electron density maps permitted the unambiguous inclusion of six stearic acid molecules in the refinement ...
The crystal structure of dimeric Lys49-phospholipase A2 myotoxin-II from Bothrops moojeni (MjTX-II) co-crystallized with stearic acid (C(18)H(36)O(2)) has been determined at a resolution of 1.8 A. The electron density maps permitted the unambiguous inclusion of six stearic acid molecules in the refinement. Two stearic acid molecules could be located in the substrate-binding cleft of each monomer in positions, which favor the interaction of their carboxyl groups with active site residues. The way of binding of stearic acids to this Lys49-PLA(2)s is analogous to phospholipids and transition state analogues to catalytically active PLA(2)s. Two additional stearic acid molecules were located at the dimer interface region, defining a hitherto unidentified acyl-binding site on the protein surface. The strictly conserved Lys122 for Lys49-PLA(2)s may play a fundamental role for stabilization of legend-protein complex. The comparison of MjTX-II/satiric acid complex with other Lys-PLA(2)s structures whose putative fatty acids were located at their active site is also analysed. Molecular details of the stearic acid/protein interactions provide insights to binding in group I/II PLA(2)s, and to the possible interactions of Lys49-PLA(2)s with target membranes.
Related Citations:
Initiating structural studies of Lys49-PLA2 homologues complexed with an anionic detergent, a fatty acid and a natural lipid Watanabe, L., Fontes, M.R., Soares, A.M., Giglio, J.R., Arni, R.K. (2003) Protein Pept Lett 10: 525
Structural and functional characterization of myotoxin I, a Lys49 phospholipase A(2) homologue from Bothrops moojeni (Caissaca) snake venom Soares, A.M., Andriao-Escarso, S.H., Angulo, Y., Lomonte, B., Gutierrez, J.M., Marangoni, S., Toyama, M.H., Arni, R.K., Giglio, J.R. (2000) Arch Biochem Biophys 373: 7
A rapid procedure for the isolation of the Lys-49 myotoxin II from Bothrops moojeni (caissaca) venom: biochemical characterization, crystallization, myotoxic and edematogenic activity Soares, A.M., Rodrigues, V.M., Homsi-Brandeburgo, M.I., Toyama, M.H., Lombardi, F.R., Arni, R.K., Giglio, J.R. (1998) Toxicon 36: 503
Crystal Structure of miotoxin-II: a myotoxic phospholipase A2 homologue from Bothrops moojeni venom de Azevedo Jr., W.F., Ward, R.J., Lombardi, F.R., Giglio, J.R., Soares, A.M., Fontes, M.R.M., Arni, R.K. (1997) Protein Pept Lett 4: 329
Organizational Affiliation:
Departamento de Física, IBILCE, UNESP, S. J. do Rio Preto-SP, Brazil.
Download Mendeley
