Abstract:
:Shiga toxin (STX), a bacterial toxin produced by Shigella dysenteriae type 1, is a hexamer composed of five receptor-binding B subunits which encircle an alpha-helix at the carboxyl terminus of the enzymatic A polypeptide. Hybrid toxins constructed by fusing the A polypeptide sequences of STX and Shiga-like toxin type II were used to confirm that the carboxyl terminus of the A subunits governs association with the B pentamers. The alpha-helix of the 293-amino-acid STX A subunit contains nine residues (serine 279 to methionine 287) which penetrate the nonpolar pore of the B-subunit pentamer. Site-directed mutagenesis was used to establish the involvement of two residues bordering this alpha-helix, aspartic acid 278 and arginine 288, in coupling the C terminus of StxA to the B pentamer. Amino acid substitutions at StxB residues arginine 33 and tryptophan 34, which are on the membrane-contacting surface of the pentamer, reduced cytotoxicity without affecting holotoxin formation. Although these B-subunit mutations did not involve receptor-binding residues, they may have induced an electrostatic repulsion between the holotoxin and the mammalian cell membrane or disrupted cytoplasmic translocation.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Jemal C,Haddad JE,Begum D,Jackson MPdoi
10.1128/jb.177.11.3128-3132.1995subject
Has Abstractpub_date
1995-06-01 00:00:00pages
3128-32issue
11eissn
0021-9193issn
1098-5530journal_volume
177pub_type
杂志文章abstract::The morphological and physiological characteristics of 20 isolates of psychrophilic Bacillus were compared with 29 strains representing nine species of mesophilic Bacillus and 2 strains of Sporosarcina ureae to determine the taxonomic position of the psychrophiles. The psychrophiles formed four distinct groups which w...
journal_title:Journal of bacteriology
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doi:10.1128/JB.94.4.889-895.1967
更新日期:1967-10-01 00:00:00
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.94.5.1502-1508.1967
更新日期:1967-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.136.1.414-418.1978
更新日期:1978-10-01 00:00:00
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journal_title:Journal of bacteriology
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更新日期:2002-05-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.169.2.917-919.1987
更新日期:1987-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2002-11-01 00:00:00
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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更新日期:2012-08-01 00:00:00
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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更新日期:1976-07-01 00:00:00
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journal_title:Journal of bacteriology
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更新日期:1961-07-01 00:00:00
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journal_title:Journal of bacteriology
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abstract::The gltA gene, encoding Sinorhizobium meliloti 104A14 citrate synthase, was isolated by complementing an Escherichia coli gltA mutant. The S. meliloti gltA gene was mutated by inserting a kanamycin resistance gene and then using homologous recombination to replace the wild-type gltA with the gltA::kan allele. The resu...
journal_title:Journal of bacteriology
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更新日期:1999-12-01 00:00:00