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The structure of the lactose permease derived from Raman spectroscopy and prediction methods.
Author(s) -
Vogel H.,
Wright J.K.,
Jähnig F.
Publication year - 1985
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1985.tb04126.x
Subject(s) - biology , permease , lactose permease , raman spectroscopy , lactose , computational biology , nuclear magnetic resonance spectroscopy , biochemistry , nuclear magnetic resonance , physics , transporter , optics , gene
The secondary structure of the lactose permease of Escherichia coli reconstituted in lipid membranes was determined by Raman spectroscopy. The alpha‐helix content is approximately 70%, the beta‐strand content below 10% and beta‐turns contribute 15%. About 1/3 of the residues in alpha‐helices and most other residues are exposed to water. Employing a method for structural prediction which accounts for amphipathic helices, 10 membrane‐spanning helices are predicted which are either hydrophobic or amphipathic. They are expected to form an outer ring of helices in the membrane. The interior of the ring would be made of residues which are predominantly hydrophilic and, evoking the analogy to sugar‐binding proteins, suited to provide the sugar binding site.