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PBP1b can be found as a dimer inEscherichia coli . Previous results suggested that dimerization involved the cysteine(s) in an intermolecular disulfide bond. We show that either deletion mutants or a mutant without cysteines is fully active and still binds penicillin and that the latter can also form dimers.

Disulfide Bridges Are Not Involved in Penicillin-Binding Protein 1b Dimerization in Escherichia coli