当前位置： SCI文献检索 > PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA期刊下所有文献 > Nucleotide sequence of the structural gene for diphtheria toxin carried by corynebacteriophage beta.

Nucleotide sequence of the structural gene for diphtheria toxin carried by corynebacteriophage beta.

Abstract：

:A 1,942-base-pair DNA segment encoding the structural gene for diphtheria toxin was sequenced, and the primary structure of the toxin was deduced. Restriction enzyme fragments corresponding to nontoxic or hypotoxic peptides of the toxin were isolated from corynebacteriophage beta and cloned into Escherichia coli on plasmid pBR322, and the sequence was determined. The mature toxin molecule deduced from the sequence has 535 amino acid residues and a molecular weight of 58,342. The deduced sequence for the fragment A moiety was the same as that determined at the protein level, except for a single serine residue, which had been mispositioned in the earlier study. Several differences were noted with respect to the partial sequence data available on the fragment B moiety, some or all of which may reflect genetic variations among populations of corynephages carrying the toxin gene. The DNA sequence predicts a 25-residue leader peptide preceding the mature protein, which is presumably involved in secretion of the toxin from lysogenized Corynebacterium diphtheriae. We infer that initiation of translation probably occurs at a GTG codon (codon -25). Cloned restriction fragments containing sequences for the amino-terminal region of toxin, together with 5' flanking regions, were expressed in E. coli. Toxin-related peptides were synthesized and secreted into the periplasmic space. These results provide a basis for applying recombinant DNA methods to the study of diphtheria toxin and for producing novel, genetically altered forms of the toxin suited to the construction of new classes of immunotoxins.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Greenfield L,Bjorn MJ,Horn G,Fong D,Buck GA,Collier RJ,Kaplan DA

doi

10.1073/pnas.80.22.6853

subject

Has Abstract

pub_date

1983-11-01 00:00:00

pages

6853-7

issue

22

eissn

0027-8424

issn

1091-6490

journal_volume

80

pub_type

杂志文章

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