PMID- 6254008 OWN - NLM STAT- MEDLINE DCOM- 19810129 LR - 20190501 IS - 0027-8424 (Print) IS - 1091-6490 (Electronic) IS - 0027-8424 (Linking) VI - 77 IP - 7 DP - 1980 Jul TI - Nucleotide sequence of the bacterial transposon Tn1681 encoding a heat-stable (ST) toxin and its identification in enterotoxigenic Escherichia coli strains. PG - 4011-5 AB - the Escherichia coli heat-stable toxin (ST I) is encoded within a transposon (Tn1681) flanked by inverted repeats of insertion sequence 1 (IS1) [So, M., Heffron, F. & McCarthy, B. J. (1979) Nature (London) 277, 453-456]. By subcloning restriction fragments and by insertion mutagenesis, we located precisely the gene for ST I within the transposon. We determined the complete nucleotide sequence of the central portion of Tn1681 (i.e., that part flanked by IS1) and identified the coding sequence of the toxin. From the nucleotide sequence, we deduced a probable amino acid sequence for ST I. The NH2-terminal portion of the amino acid sequence is extremely hydrophobic and bears a striking resemblance to the signal sequence of the fd phage minor coat protein. By using a subcloned restriction fragment containing the gene for ST I but no IS1 sequences, we determined (i) that the ST toxin with activity assayable in suckling mice (ST I) is genetically distinct from the St toxin assayable in ligated ileal loops (ST II) and (ii) that ST I can be responsible for diarrheal disease in different animals. FAU - So, M AU - So M FAU - McCarthy, B J AU - McCarthy BJ LA - eng SI - GENBANK/J01831 PT - Journal Article PL - United States TA - Proc Natl Acad Sci U S A JT - Proceedings of the National Academy of Sciences of the United States of America JID - 7505876 RN - 0 (Bacterial Toxins) RN - 0 (DNA Transposable Elements) RN - 0 (DNA, Recombinant) RN - 0 (Enterotoxins) RN - 0 (RNA, Messenger) SB - IM MH - Amino Acid Sequence MH - Bacterial Toxins/*genetics MH - Base Sequence MH - Cloning, Molecular/methods MH - *DNA Transposable Elements MH - DNA, Recombinant MH - Enterotoxins/*genetics MH - Escherichia coli/*genetics MH - Hot Temperature MH - Nucleic Acid Conformation MH - RNA, Messenger/genetics PMC - PMC349758 EDAT- 1980/07/01 00:00 MHDA- 1980/07/01 00:01 PMCR- 1981/01/01 CRDT- 1980/07/01 00:00 PHST- 1980/07/01 00:00 [pubmed] PHST- 1980/07/01 00:01 [medline] PHST- 1980/07/01 00:00 [entrez] PHST- 1981/01/01 00:00 [pmc-release] AID - 10.1073/pnas.77.7.4011 [doi] PST - ppublish SO - Proc Natl Acad Sci U S A. 1980 Jul;77(7):4011-5. doi: 10.1073/pnas.77.7.4011.