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| | ==PERTURBATION OF TRP 138 IN T4 LYSOZYME BY MUTATIONS AT GLN 105 USED TO CORRELATE CHANGES IN STRUCTURE, STABILITY, SOLVATION, AND SPECTROSCOPIC PROPERTIES== | | ==PERTURBATION OF TRP 138 IN T4 LYSOZYME BY MUTATIONS AT GLN 105 USED TO CORRELATE CHANGES IN STRUCTURE, STABILITY, SOLVATION, AND SPECTROSCOPIC PROPERTIES== |
| - | <StructureSection load='1l98' size='340' side='right' caption='[[1l98]], [[Resolution|resolution]] 1.80Å' scene=''> | + | <StructureSection load='1l98' size='340' side='right'caption='[[1l98]], [[Resolution|resolution]] 1.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1l98]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Bpt4 Bpt4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1L98 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1L98 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1l98]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_virus_T4 Escherichia virus T4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1L98 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1L98 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</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]] 1.8Å</td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Lysozyme Lysozyme], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.17 3.2.1.17] </span></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</scene></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=1l98 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1l98 OCA], [http://pdbe.org/1l98 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1l98 RCSB], [http://www.ebi.ac.uk/pdbsum/1l98 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1l98 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=1l98 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1l98 OCA], [https://pdbe.org/1l98 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1l98 RCSB], [https://www.ebi.ac.uk/pdbsum/1l98 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1l98 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/LYS_BPT4 LYS_BPT4]] Helps to release the mature phage particles from the cell wall by breaking down the peptidoglycan. | + | [https://www.uniprot.org/uniprot/ENLYS_BPT4 ENLYS_BPT4] Endolysin with lysozyme activity that degrades host peptidoglycans and participates with the holin and spanin proteins in the sequential events which lead to the programmed host cell lysis releasing the mature viral particles. Once the holin has permeabilized the host cell membrane, the endolysin can reach the periplasm and break down the peptidoglycan layer.<ref>PMID:22389108</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | </div> | | </div> |
| | <div class="pdbe-citations 1l98" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 1l98" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[Lysozyme 3D structures|Lysozyme 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bpt4]] | + | [[Category: Escherichia virus T4]] |
| - | [[Category: Lysozyme]] | + | [[Category: Large Structures]] |
| - | [[Category: Matthews, B W]] | + | [[Category: Matthews BW]] |
| - | [[Category: Mcintosh, L P]] | + | [[Category: Mcintosh LP]] |
| - | [[Category: Pjura, P]] | + | [[Category: Pjura P]] |
| - | [[Category: Wozniak, J A]] | + | [[Category: Wozniak JA]] |
| Structural highlights
Function
ENLYS_BPT4 Endolysin with lysozyme activity that degrades host peptidoglycans and participates with the holin and spanin proteins in the sequential events which lead to the programmed host cell lysis releasing the mature viral particles. Once the holin has permeabilized the host cell membrane, the endolysin can reach the periplasm and break down the peptidoglycan layer.[1]
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
In order to correlate between spectroscopic and structural changes in a protein, the environment of Trp 135 in T4 lysozyme was deliberately perturbed by the replacement of Gln 105 with alanine (Q105A), glycine (Q105G), and glutamic acid (Q105E). In wild-type lysozyme, Trp 135 is buried, but the indole nitrogen is hydrogen-bonded to the side-chain of Gln 105. In the Q105G and Q105A mutant structures, the indole nitrogen becomes accessible to solvent. Crystallographic analysis shows that the structures of all of the mutants are similar to wild-type. There are, however, distinct rearrangements of the local solvent structure in response to the new side-chains. There are also small but significant changes in the relative orientations of the two domains of the protein that appear to result from a series of small, concerted movements of side-chains adjacent to residue 105. Evaluation of the fluorescence and phosphorescence of the mutant proteins in terms of their observed three-dimensional structures shows that large spectral changes do not necessarily imply large changes in structure or in static solvent accessibility. Increases in polar relaxation about the excited state of tryptophan may be the result of only small increases in local dynamics or solvent exposure. 1H-NMR was also used to monitor the effects of the substitutions on Trp 138. In Q105E, but not in Q105G, Q105A and WT, the H epsilon chemical shift of Trp 138 is very pH-dependent, apparently reflecting the titration of Glu 105 which has a spectroscopically determined pKa of 6.0. The elevation of the pKa of Glu 105 in Q105E is also reflected in the pH dependence of the stability of this mutant.
Perturbation of Trp 138 in T4 lysozyme by mutations at Gln 105 used to correlate changes in structure, stability, solvation, and spectroscopic properties.,Pjura P, McIntosh LP, Wozniak JA, Matthews BW Proteins. 1993 Apr;15(4):401-12. PMID:8460110[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Moussa SH, Kuznetsov V, Tran TA, Sacchettini JC, Young R. Protein determinants of phage T4 lysis inhibition. Protein Sci. 2012 Apr;21(4):571-82. doi: 10.1002/pro.2042. Epub 2012 Mar 2. PMID:22389108 doi:http://dx.doi.org/10.1002/pro.2042
- ↑ Pjura P, McIntosh LP, Wozniak JA, Matthews BW. Perturbation of Trp 138 in T4 lysozyme by mutations at Gln 105 used to correlate changes in structure, stability, solvation, and spectroscopic properties. Proteins. 1993 Apr;15(4):401-12. PMID:8460110 doi:http://dx.doi.org/10.1002/prot.340150407
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