View source for 1jhf

[[Image:1jhf.jpg|left|200px]]

 {{Structure
|PDB= 1jhf |SIZE=350|CAPTION= <scene name='initialview01'>1jhf</scene>, resolution 1.8&Aring;
|SITE= 
|LIGAND= <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>
|ACTIVITY= <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>
|GENE= LexA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
|DOMAIN=
|RELATEDENTRY=[[1jhc|1JHC]], [[1jhe|1JHE]], [[1jhh|1JHH]]
|RESOURCES=<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.ebi.ac.uk/pdbsum/1jhf PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1jhf RCSB]</span>
}}

'''LEXA G85D MUTANT'''


==Overview==
LexA 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.

==About this Structure==
1JHF is a [[Single protein]] structure of 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]. 

==Reference==
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:[http://www.ncbi.nlm.nih.gov/pubmed/11551506 11551506]
[[Category: Escherichia coli]]
[[Category: Repressor lexA]]
[[Category: Single protein]]
[[Category: Little, J W.]]
[[Category: Luo, Y.]]
[[Category: Mosimann, S.]]
[[Category: Pfuetzner, R A.]]
[[Category: Strynadka, N C.J.]]
[[Category: lexa sos repressor]]

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