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The projection structure of Perfringolysin O ( Clostridium perfringens θ‐toxin)
Author(s) -
Olofsson Anders,
Hebert Hans,
Thelestam Monica
Publication year - 1993
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(93)80050-5
Subject(s) - trimer , crystallography , ring (chemistry) , monomer , radius , electron microscope , cytolysin , materials science , chemistry , molecular physics , optics , physics , dimer , polymer , virulence , biochemistry , composite material , computer security , organic chemistry , computer science , gene
The cytolysin Perfringolysin O was applied to lipid layers and the obtained ring‐shaped oligomers analyzed by electron microscopy and image processing. The final result shows the periodic repeat of 2.4 nm along the outer rim of the ring. The asymmetric protein unit, corresponding to one monomer, spans the ring from the convex to the concave surface. It shows a clear protein peak close to the outer radius and less density in the middle of the oligomer. The number of monomers in the average ring is 50, and the inner radius of the aggregate is approximately 15 nm.