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FEBS Lett. 1991 Mar 25;280(2):379-82.

The structure of porin from Rhodobacter capsulatus at 1.8 A resolution.

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Institut für Organische Chemie und Biochemie der Universität, Freiburg, Germany.


The structure of the porin from Rhodobacter capsulatus was determined at a resolution of 1.8 A. The analysis started from a closely related crystal structure that had been solved at a medium resolution of 3 A using multiple isomorphous replacement and solvent flattening. The new structure contains the complete sequence of 301 amino acid residues. Refinement of the model is under way; the present R-factor is 22% with good geometry. Except for the lengths of several loops, the resulting chain fold corresponds to the medium resolution model. The membrane channel is lined by a large number of ionogenic side chains with characteristic segregation of differently charged groups.

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