Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
16
pubmed:dateCreated
2005-8-3
pubmed:abstractText
Inactivation of the lambdoid phage repressor protein is necessary to induce lytic growth of a lambdoid prophage. Activated RecA, the mediator of the host SOS response to DNA damage, causes inactivation of the repressor by stimulating the repressor's nascent autocleavage activity. The repressor of bacteriophage lambda and its homolog, LexA, preferentially undergo RecA-stimulated autocleavage as free monomers, which requires that each monomer mediates its own (intramolecular) cleavage. The cI repressor of bacteriophage 434 preferentially undergoes autocleavage as a dimer specifically bound to DNA, opening the possibility that one 434 repressor subunit may catalyze proteolysis of its partner subunit (intermolecular cleavage) in the DNA-bound dimer. Here, we first identified and mutagenized the residues at the cleavage and active sites of 434 repressor. We utilized the mutant repressors to show that the DNA-bound 434 repressor dimer overwhelmingly prefers to use an intramolecular mechanism of autocleavage. Our data suggest that the 434 repressor cannot be forced to use an intermolecular cleavage mechanism. Based on these data, we propose a model in which the cleavage-competent conformation of the repressor is stabilized by operator binding.
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-10430871, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-10588892, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-11483531, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-11551506, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-12509298, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-12680780, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-1453451, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-14679217, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-15516580, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-158477, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-1911941, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-2449095, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-2522996, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-287002, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-2948553, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-3279418, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-3820305, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-609095, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6101204, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6231641, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6242868, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6369323, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6444245, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6447873, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6449596, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6461657, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6554278, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-6896364, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-7023697, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-7027255, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-7961451, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-8254659, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-8450541, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-8513500, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-9023209, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-9406544, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-9465040, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-9707548, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-9799634, http://linkedlifedata.com/resource/pubmed/commentcorrection/16077107-9925794
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0021-9193
pubmed:author
pubmed:issnType
Print
pubmed:volume
187
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
5624-30
pubmed:dateRevised
2009-11-18
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
The bacteriophage 434 repressor dimer preferentially undergoes autoproteolysis by an intramolecular mechanism.
pubmed:affiliation
Department of Biological Sciences, University at Buffalo, Cooke Hall, North Campus, Buffalo, NY 14260, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.