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2gln

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(New page: 200px<br /> <applet load="2gln" size="450" color="white" frame="true" align="right" spinBox="true" caption="2gln, resolution 1.98&Aring;" /> '''Crystal structure o...)
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[[Image:2gln.gif|left|200px]]<br />
 
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<applet load="2gln" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="2gln, resolution 1.98&Aring;" />
 
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'''Crystal structure of Mycobacterium tuberculosis trHbN, GlnE11Ala mutant'''<br />
 
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==Overview==
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==Crystal structure of Mycobacterium tuberculosis trHbN, GlnE11Ala mutant==
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The crystallographic structure of oxygenated trHbN from Mycobacterium, tuberculosis showed an extended heme distal site hydrogen-bonding network, that includes Y(B10), Q(E11), and the bound O(2) (Milani, M., et al., (2001) EMBO J. 20, 3902-3909). In the present work, we analyze the effects, that substitutions at the B10 and E11 positions exert on the heme and its, coordinated ligands, using steady-state resonance Raman spectroscopy, absorption spectroscopy and X-ray crystallography. Our results show that, (1) residues Y(B10) and Q(E11) control the binding and the ionization, state of the heme-bound water molecules in ferric trHbN and are important, in keeping the sixth coordination position vacant in deoxy trHbN; (2), residue Q(E11) plays a role in maintaining the integrity of the proximal, Fe-His bond in deoxy trHbN; (3) in wild-type oxy-trHbN, the size and, hydrogen-bonding capability of residue E11 is important to sustain proper, interaction between Y(B10) and the heme-bound O(2); (4) CO-trHbN is in a, conformational equilibrium, where either the Y(B10) or the Q(E11) residue, interacts with the heme-bound CO; and (5) Y(B10) and Q(E11) residues, control the conformation (and likely the dynamics) of the protein matrix, tunnel gating residue F(E15). These findings suggest that the functional, processes of ligand binding and diffusion are controlled in trHbN through, the dynamic interaction of residues Y(B10), Q(E11), F(E15), and the heme, ligand.
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<StructureSection load='2gln' size='340' side='right'caption='[[2gln]], [[Resolution|resolution]] 1.98&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[2gln]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GLN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2GLN FirstGlance]. <br>
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2GLN is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis] with NA, PO4, CYN and HEM as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2GLN OCA].
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.98&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CYN:CYANIDE+ION'>CYN</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
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==Reference==
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2gln FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gln OCA], [https://pdbe.org/2gln PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2gln RCSB], [https://www.ebi.ac.uk/pdbsum/2gln PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2gln ProSAT], [https://www.topsan.org/Proteins/TBSGC/2gln TOPSAN]</span></td></tr>
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Ligand interactions in the distal heme pocket of Mycobacterium tuberculosis truncated hemoglobin N: roles of TyrB10 and GlnE11 residues., Ouellet Y, Milani M, Couture M, Bolognesi M, Guertin M, Biochemistry. 2006 Jul 25;45(29):8770-81. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16846220 16846220]
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/TRHBN_MYCTU TRHBN_MYCTU] Binds oxygen cooperatively with very high affinity (P(50) = 0.013 mmHg at 20 degrees Celsius) because of a fast combination (25 microM(-1).s(-1)) and a slow dissociation (0.2 s(-1)) rate.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gl/2gln_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2gln ConSurf].
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<div style="clear:both"></div>
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__TOC__
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</StructureSection>
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[[Category: Large Structures]]
[[Category: Mycobacterium tuberculosis]]
[[Category: Mycobacterium tuberculosis]]
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[[Category: Single protein]]
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[[Category: Bolognesi M]]
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[[Category: Bolognesi, M.]]
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[[Category: Milani M]]
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[[Category: Milani, M.]]
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[[Category: CYN]]
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[[Category: HEM]]
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[[Category: NA]]
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[[Category: PO4]]
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[[Category: truncated hemoglobin; mutant]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Thu Nov 8 13:30:24 2007''
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Current revision

Crystal structure of Mycobacterium tuberculosis trHbN, GlnE11Ala mutant

PDB ID 2gln

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