Abstract:
:Membrane-associated and periplasmic proteins of Agrobacterium tumefaciens C-58 were compared with those from avirulent (nontumrigenic) derivative strains by slab and two-dimensional gel electrophoresis. Two proteins (Per-I and Per-2), with a molecular weight of 37,500 and 37,300, respectively, were detected in the supernatant fraction of cells of strain C-58 treated with EDTA and lysozyme in which a 117-megadalton plasmid confers virulence on the organism. The same proteins are missing in an avirulent plasmid-free derivative of C-58. When this derivative is mated with C-58, the resulting transconjugants regain the large C-58 plasmid together with the restoration of virulence and the expression of Per-1 and Per-2 proteins. When the transconjugants were cured of their plasmid, they concomitantly lost their virulence and Per-1 and Per-2. The functional roles of these proteins are unknown, but they are associated with the outer membrane and periplasmic fraction of the Agrobacterium cell. If directly involved in tumorigenesis, these proteins are not the sole determinants of tumorigenicity because they are synthesized in an avirulent derivative of C-58 that carries a deletion in the plasmid in the region conferring the tumorigenic phenotype. These results strongly suggest that the Per-1 and Per-2 proteins are plasmid-coded gene products. The possible roles of these proteins in specifying host range and host-cell attachment are also discussed.
journal_name
Proc Natl Acad Sci U S Aauthors
Sonoki S,Kado CIdoi
10.1073/pnas.75.8.3796subject
Has Abstractpub_date
1978-08-01 00:00:00pages
3796-800issue
8eissn
0027-8424issn
1091-6490journal_volume
75pub_type
杂志文章abstract::We have shown that the silk fibroin gene from Bombyx mori is faithfully transcribed in an in vitro transcription system of the HeLa cell extract prepared by the method of Manley et al. [Manley, J. L., Fire, A., Cano, A., Sharp, P. A. & Gefter, M. L. (1980) Proc. Natl. Acad. Sci. USA 77, 3855-3859]. Using this system a...
journal_title:Proceedings of the National Academy of Sciences of the United States of America
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doi:10.1073/pnas.78.8.4838
更新日期:1981-08-01 00:00:00
abstract::Therapeutic cancer vaccines can be effective for treating patients, but clinical responses vary considerably from patient to patient. Early indicators of a favorable response are crucial for making individualized treatment decisions and advancing vaccine design, but no validated biomarkers are currently available. In ...
journal_title:Proceedings of the National Academy of Sciences of the United States of America
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1073/pnas.1314722111
更新日期:2014-04-29 00:00:00
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pub_type: 杂志文章
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更新日期:2019-03-19 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:1998-07-21 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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doi:10.1073/pnas.92.4.1092
更新日期:1995-02-14 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
pub_type: 杂志文章
doi:10.1073/pnas.68.3.554
更新日期:1971-03-01 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
pub_type: 杂志文章
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更新日期:1984-07-01 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:2018-08-28 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
pub_type: 杂志文章
doi:10.1073/pnas.77.8.4993
更新日期:1980-08-01 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:2006-04-04 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:1979-02-01 00:00:00
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更新日期:2011-08-16 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:2004-02-17 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:2017-07-03 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:2008-01-29 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:2016-07-12 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:2007-12-18 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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doi:10.1073/pnas.92.20.9397
更新日期:1995-09-26 00:00:00