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. 1975 Apr;72(4):1254-7.
doi: 10.1073/pnas.72.4.1254.

Molecular basis of beta-galactosidase alpha-complementation

K E Langley, M R Villarejo, A V Fowler, P J Zamenhof, I Zabin

Molecular basis of beta-galactosidase alpha-complementation

K E Langley et al. Proc Natl Acad Sci U S A. 1975 Apr.

Abstract

In previous studies, a cyanogen bromide peptide derived from amino-acid residues 3-92 of beta-galactosidase (EC 3.2.1.23; beta-D-galactoside galactohydrolase) was shown to have alpha-donor activity in intracistronic alpha-complementation. We have now isolated the defective beta-galactosidase alpha-acceptor protein from the deletion mutant strain M15 of Escherichia coli and find that it lacks residues 11-41 of betal-galactosidase. This is demonstrated by the isolation and sequence determination of a cyanogen bromide peptide from the M15 protein, which is identical to the corresponding peptide from beta-galactosidase except for the missing amino acids. We conclude that the alpha-donor peptide restores the region missing in the M15 protein.

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