NMR and restrained molecular dynamics study of the three-dimensional solution structure of toxin FS2, a specific blocker of the L-type calcium channel, isolated from black mamba venom.

Abstract:

:The three-dimensional solution structure of toxin FS2, a 60-residue polypeptide isolated from the venom of black mamba snake (Dendroaspis polylepis polylepis), has been determined by nuclear magnetic resonance spectroscopy. Using 600 NOE constraints and 55 dihedral angle constraints, a set of 20 structures obtained from distance-geometry calculations was further refined by molecular dynamics calculations using a combined simulated annealing-restrained MD protocol. The resulting 20 conformers, taken to represent the solution structure, give an average rmsd of 1.2 A for their backbone atoms, relative to the average structure. The overall resulting three-fingered structure is similar to those already observed in several postsynaptic neurotoxins, cardiotoxins, and fasciculins, which all share with toxin FS2 the same network of four disulfide bridges. The overall concavity of the molecule, considered as a flat bottomed dish, is oriented toward the C-terminal loop of the molecule. This orientation is similar to that of fasciculins and cardiotoxins but opposite to that of neurotoxins. On the basis of the local rms displacements between the 20 conformers, the structure of the first loop appears to be less well defined in FS2 than in the previously reported neurotoxin structures, but fasciculin 1 shows a similar trend with particularly high temperature factors for this part of the X-ray structure. The concave side which presents most of the positively charged residues is quite similar in FS2 and fasciculin 1. The main difference is shown by the convex side of the third loop, mostly hydrophobic in FS2, in contrast to the pair of negatively charged aspartates in fasciculin 1. This difference could be one of the factors leading to the distinct pharmacological properties-L-type calcium channel blocker for FS2 and cholinesterase inhibitor for fasciculin--observed for these two subgroups of the "angusticeps-type" toxins.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Albrand JP,Blackledge MJ,Pascaud F,Hollecker M,Marion D

doi

10.1021/bi00017a022

subject

Has Abstract

pub_date

1995-05-02 00:00:00

pages

5923-37

issue

17

eissn

0006-2960

issn

1520-4995

journal_volume

34

pub_type

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