Costa JJ, Michel JL, Rappuoli R, Murphy JR. Restriction map of corynebacteriophages beta c and beta vir and physical localization of the diphtheria tox operon.
J Bacteriol 1981;
148:124-30. [PMID:
6270058 PMCID:
PMC216174 DOI:
10.1128/jb.148.1.124-130.1981]
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Abstract
The BamHI, EcoRI, HindIII, and KpnI restriction endonuclease maps of corynebacteriophage beta c and beta vir were constructed. beta vir appeared to be identical to beta c, except for an approximate 1-kilobase deletion that removed a BamHI site, two KpnI sites, and three EcoRI restriction sites. The diphtheria tox operon was located by hybridizing in vitro 32P-labeled tox messenger ribonucleic acid to blots of endonuclease-digested beta deoxyribonucleic acids. The messenger ribonucleic acid probe was found to hybridize to a 2.1-kilobase region of the beta genome. Since approximately 1.9 kilobases is required to encode prodiphtheria toxin, the data presented strongly suggest that the tox operon of beta is monocistronic.
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