Download MendeleyStructure of agkistrodotoxin in an orthorhombic crystal form with six molecules per asymmetric unit.
Tang, L., Zhou, Y.C., Lin, Z.J.(1999) Acta Crystallogr D Biol Crystallogr 55: 1986-1996
- PubMed: 10666574
- DOI: https://doi.org/10.1107/s0907444999012603
- Primary Citation of Related Structures:
1BJJ - PubMed Abstract:
The structure of agkistrodotoxin crystallized under basic conditions has been determined at 2.8 A resolution by the molecular-replacement technique and refined to a crystallographic R factor of 0.194 and a free R factor of 0.260 with good stereochemistry. The molecular packing in the crystal differs from other PLA(2)s. The six molecules in the asymmetric unit form three dimers linked by Ca(2+) ions in a near-perfect six-ligand octahedral coordinating system. Extensive intermolecular hydrophobic interactions occur at the interfacial recognition site of each neurotoxin molecule, which provides an insight into phospholipase A(2)-membrane interactions. This hydrophobic interaction-induced molecular association along the interfacial recognition site suggests a self-protection mechanism of agkistrodotoxin.
Organizational Affiliation:
National Laboratory of Biological Macromolecules, Institute of Biophysics, Academia Sinica, Beijing 100101, People's Republic of China.
