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| | <StructureSection load='3h3u' size='340' side='right'caption='[[3h3u]], [[Resolution|resolution]] 2.90Å' scene=''> | | <StructureSection load='3h3u' size='340' side='right'caption='[[3h3u]], [[Resolution|resolution]] 2.90Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3h3u]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Myctu Myctu]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3H3U OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3H3U FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3h3u]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis_H37Rv Mycobacterium tuberculosis H37Rv]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3H3U OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3H3U FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CMP:ADENOSINE-3,5-CYCLIC-MONOPHOSPHATE'>CMP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.9Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1g6n|1g6n]], [[1o3t|1o3t]]</div></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CMP:ADENOSINE-3,5-CYCLIC-MONOPHOSPHATE'>CMP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Rv3676 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83332 MYCTU])</td></tr>
| + | |
| | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3h3u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3h3u OCA], [https://pdbe.org/3h3u PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3h3u RCSB], [https://www.ebi.ac.uk/pdbsum/3h3u PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3h3u ProSAT]</span></td></tr> | | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3h3u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3h3u OCA], [https://pdbe.org/3h3u PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3h3u RCSB], [https://www.ebi.ac.uk/pdbsum/3h3u PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3h3u ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/CRP_MYCTO CRP_MYCTO]] Global transcriptional regulator that complexes with cAMP and binds to specific DNA promoter sites, causing DNA-bending, to regulate transcription. cAMP improves binding to specific DNA sequences, probably by altering protein conformation. Activates expression of whiB1.<ref>PMID:16946269</ref>
| + | [https://www.uniprot.org/uniprot/CRPL_MYCTU CRPL_MYCTU] Global transcriptional regulator that complexes with cAMP and binds to specific DNA promoter sites, causing DNA-bending, to regulate transcription. cAMP improves binding to specific DNA sequences, probably by altering protein conformation. The CRP regulon is predicted to contain about 115 genes. Some genes are activated by CRP (rpfA, whiB1) while others are repressed (fadD10). There are 2 CRP-binding sites in the promoter of whiB1, at low concentrations of CRP with or without cAMP transcription of whiB1 is enhanced via site CRP1, then repressed as site CRP2 is filled.<ref>PMID:15882420</ref> <ref>PMID:20028978</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Myctu]] | + | [[Category: Mycobacterium tuberculosis H37Rv]] |
| - | [[Category: Akhter, Y]] | + | [[Category: Akhter Y]] |
| - | [[Category: Akif, M]] | + | [[Category: Akif M]] |
| - | [[Category: Hasnain, S E]] | + | [[Category: Hasnain SE]] |
| - | [[Category: Joshi, D C]] | + | [[Category: Joshi DC]] |
| - | [[Category: Kumar, P]] | + | [[Category: Kumar P]] |
| - | [[Category: Mande, S C]] | + | [[Category: Mande SC]] |
| - | [[Category: Allostery]]
| + | |
| - | [[Category: Apo crp]]
| + | |
| - | [[Category: Dimer]]
| + | |
| - | [[Category: Dna-binding]]
| + | |
| - | [[Category: Transcription]]
| + | |
| - | [[Category: Transcription regulation]]
| + | |
| Structural highlights
Function
CRPL_MYCTU Global transcriptional regulator that complexes with cAMP and binds to specific DNA promoter sites, causing DNA-bending, to regulate transcription. cAMP improves binding to specific DNA sequences, probably by altering protein conformation. The CRP regulon is predicted to contain about 115 genes. Some genes are activated by CRP (rpfA, whiB1) while others are repressed (fadD10). There are 2 CRP-binding sites in the promoter of whiB1, at low concentrations of CRP with or without cAMP transcription of whiB1 is enhanced via site CRP1, then repressed as site CRP2 is filled.[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 PubMed
Cyclic AMP (cAMP) receptor protein, which acts as the sensor of cAMP levels in cells, is a well-studied transcription factor that is best known for allosteric changes effected by the binding of cAMP. Although genetic and biochemical data on the protein are available from several sources, structural information about the cAMP-free protein has been lacking. Therefore, the precise atomic events that take place upon binding of cAMP, leading to conformational changes in the protein and its activation to bind DNA, have been elusive. In this work we solved the cAMP-free crystal structure of the Mycobacterium tuberculosis homolog of cAMP receptor protein at 2.9 A resolution, and carried out normal-mode analysis to map conformational transitions among its various conformational states. In our structure, the cAMP-binding domain holds onto the DNA-binding domain via strong hydrophobic interactions, thereby freezing the latter in a conformation that is not competent to bind DNA. The two domains release each other in the presence of cAMP, making the DNA-binding domain more flexible and allowing it to bind its cognate DNA via an induced-fit mechanism. The structure of the cAMP-free protein and results of the normal-mode analysis therefore highlight an elegant mechanism of the allosteric changes effected by the binding of cAMP.
Mapping conformational transitions in cyclic AMP receptor protein: crystal structure and normal-mode analysis of Mycobacterium tuberculosis apo-cAMP receptor protein.,Kumar P, Joshi DC, Akif M, Akhter Y, Hasnain SE, Mande SC Biophys J. 2010 Jan 20;98(2):305-14. PMID:20338852[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Rickman L, Scott C, Hunt DM, Hutchinson T, Menendez MC, Whalan R, Hinds J, Colston MJ, Green J, Buxton RS. A member of the cAMP receptor protein family of transcription regulators in Mycobacterium tuberculosis is required for virulence in mice and controls transcription of the rpfA gene coding for a resuscitation promoting factor. Mol Microbiol. 2005 Jun;56(5):1274-86. PMID:15882420 doi:10.1111/j.1365-2958.2005.04609.x
- ↑ Stapleton M, Haq I, Hunt DM, Arnvig KB, Artymiuk PJ, Buxton RS, Green J. Mycobacterium tuberculosis cAMP receptor protein (Rv3676) differs from the Escherichia coli paradigm in its cAMP binding and DNA binding properties and transcription activation properties. J Biol Chem. 2010 Mar 5;285(10):7016-27. PMID:20028978 doi:10.1074/jbc.M109.047720
- ↑ Kumar P, Joshi DC, Akif M, Akhter Y, Hasnain SE, Mande SC. Mapping conformational transitions in cyclic AMP receptor protein: crystal structure and normal-mode analysis of Mycobacterium tuberculosis apo-cAMP receptor protein. Biophys J. 2010 Jan 20;98(2):305-14. PMID:20338852 doi:10.1016/j.bpj.2009.10.016
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