Abstract
The peptidoglycan-associated protein fractions of various strains of Escherichia coli and of other gramnegative rod-shaped bacteria were isolated and compared. Peptidoglycan-associated proteins are always outer membrane proteins. All E. coli strains tested contain at least one peptidoglycan-associated protein. Procedures are described for the isolation of the two peptidoglycan-associated proteins b and c of E. coli K12. All nine Enterobacteriaceae tested contain one or more peptidoglycan-associated proteins. Two gramnegative rod-shaped bacteria that do not belong to the family of Enterobacteriaceae do not contain peptidoglycan-associated protein. It is suggested that peptidoglycan-associated proteins form, or are part of, hydrophilic channels through the outer membrane.
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