1jhf: Difference between revisions
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== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1jhf]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JHF OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1JHF FirstGlance]. <br> | <table><tr><td colspan='2'>[[1jhf]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JHF OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1JHF FirstGlance]. <br> | ||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>< | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | ||
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1jhc|1jhc]], [[1jhe|1jhe]], [[1jhh|1jhh]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1jhc|1jhc]], [[1jhe|1jhe]], [[1jhh|1jhh]]</td></tr> | ||
<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">LexA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])</td></tr> | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">LexA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])</td></tr> | ||
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Repressor_lexA Repressor lexA], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.88 3.4.21.88] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Repressor_lexA Repressor lexA], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.88 3.4.21.88] </span></td></tr> | ||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1jhf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jhf OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1jhf RCSB], [http://www.ebi.ac.uk/pdbsum/1jhf PDBsum]</span></td></tr> | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1jhf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jhf OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1jhf RCSB], [http://www.ebi.ac.uk/pdbsum/1jhf PDBsum]</span></td></tr> | ||
<table> | </table> | ||
== Function == | |||
[[http://www.uniprot.org/uniprot/LEXA_ECOLI LEXA_ECOLI]] Represses a number of genes involved in the response to DNA damage (SOS response), including recA and lexA. Binds to the 16 bp palindromic sequence 5'-CTGTATATATATACAG-3'. In the presence of single-stranded DNA, RecA interacts with LexA causing an autocatalytic cleavage which disrupts the DNA-binding part of LexA, leading to derepression of the SOS regulon and eventually DNA repair.<ref>PMID:7027255</ref> <ref>PMID:7027256</ref> | |||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Repressor lexA]] | [[Category: Repressor lexA]] | ||
[[Category: Little, J W | [[Category: Little, J W]] | ||
[[Category: Luo, Y | [[Category: Luo, Y]] | ||
[[Category: Mosimann, S | [[Category: Mosimann, S]] | ||
[[Category: Pfuetzner, R A | [[Category: Pfuetzner, R A]] | ||
[[Category: Strynadka, N C.J | [[Category: Strynadka, N C.J]] | ||
[[Category: Hydrolase]] | [[Category: Hydrolase]] | ||
[[Category: Lexa sos repressor]] | [[Category: Lexa sos repressor]] | ||
Revision as of 22:34, 24 December 2014
LEXA G85D MUTANTLEXA G85D MUTANT
Structural highlights
Function[LEXA_ECOLI] Represses a number of genes involved in the response to DNA damage (SOS response), including recA and lexA. Binds to the 16 bp palindromic sequence 5'-CTGTATATATATACAG-3'. In the presence of single-stranded DNA, RecA interacts with LexA causing an autocatalytic cleavage which disrupts the DNA-binding part of LexA, leading to derepression of the SOS regulon and eventually DNA repair.[1] [2] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedLexA repressor undergoes a self-cleavage reaction. In vivo, this reaction requires an activated form of RecA, but it occurs spontaneously in vitro at high pH. Accordingly, LexA must both allow self-cleavage and yet prevent this reaction in the absence of a stimulus. We have solved the crystal structures of several mutant forms of LexA. Strikingly, two distinct conformations are observed, one compatible with cleavage, and the other in which the cleavage site is approximately 20 A from the catalytic center. Our analysis provides insight into the structural and energetic features that modulate the interconversion between these two forms and hence the rate of the self-cleavage reaction. We suggest RecA activates the self-cleavage of LexA and related proteins through selective stabilization of the cleavable conformation. Crystal structure of LexA: a conformational switch for regulation of self-cleavage.,Luo Y, Pfuetzner RA, Mosimann S, Paetzel M, Frey EA, Cherney M, Kim B, Little JW, Strynadka NC Cell. 2001 Sep 7;106(5):585-94. PMID:11551506[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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