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4g4h

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Revision as of 21:31, 4 August 2016

100K X-ray diffraction study of carboplatin binding to HEWL in DMSO media after 13 months of crystal storage

Structural highlights

4g4h is a 1 chain structure with sequence from Chick. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, ,
Related:	4dd0, 4dd1, 4dd2, 4dd3, 4dd4, 4dd6, 4dd7, 4dd9, 4dda, 4ddb, 4ddc, 4g49, 4g4a, 4g4b, 4g4c
Activity:	Lysozyme, with EC number 3.2.1.17
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[LYSC_CHICK] Lysozymes have primarily a bacteriolytic function; those in tissues and body fluids are associated with the monocyte-macrophage system and enhance the activity of immunoagents. Has bacteriolytic activity against M.luteus.^[1]

Publication Abstract from PubMed

The anticancer complexes cisplatin and carboplatin are known to bind to both the Ndelta and the N atoms of His15 of hen egg-white lysozyme (HEWL) in the presence of dimethyl sulfoxide (DMSO). However, neither binds in aqueous media after 4 d of crystallization and crystal growth, suggesting that DMSO facilitates cisplatin/carboplatin binding to the N atoms of His15 by an unknown mechanism. Crystals of HEWL cocrystallized with cisplatin in both aqueous and DMSO media, of HEWL cocrystallized with carboplatin in DMSO medium and of HEWL cocrystallized with cisplatin and N-acetylglucosamine (NAG) in DMSO medium were stored for between seven and 15 months. X-ray diffraction studies of these crystals were carried out on a Bruker APEX II home-source diffractometer at room temperature. Room-temperature X-ray diffraction data collection removed the need for cryoprotectants to be used, ruling out any effect that the cryoprotectants might have had on binding to the protein. Both cisplatin and carboplatin still bind to both the Ndelta and N atoms of His15 in DMSO media as expected, but more detail for the cyclobutanedicarboxylate (CBDC) moiety of carboplatin was observed at the N binding site. However, two molecules of cisplatin were now observed to be bound to His15 in aqueous conditions. The platinum peak positions were identified using anomalous difference electron-density maps as a cross-check with Fo-Fc OMIT electron-density maps. The occupancies of each binding site were calculated using SHELXTL. These results show that over time cisplatin binds to both N atoms of His15 of HEWL in aqueous media, whereas this binding is speeded up in the presence of DMSO. The implication of cisplatin binding to proteins after a prolonged period of time is an important consideration for the length of treatment in patients who are given cisplatin.

Room-temperature X-ray diffraction studies of cisplatin and carboplatin binding to His15 of HEWL after prolonged chemical exposure.,Tanley SW, Schreurs AM, Kroon-Batenburg LM, Helliwell JR Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Nov 1;68(Pt 11):1300-6., doi: 10.1107/S1744309112042005. Epub 2012 Oct 26. PMID:23143236^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Maehashi K, Matano M, Irisawa T, Uchino M, Kashiwagi Y, Watanabe T. Molecular characterization of goose- and chicken-type lysozymes in emu (Dromaius novaehollandiae): evidence for extremely low lysozyme levels in emu egg white. Gene. 2012 Jan 15;492(1):244-9. doi: 10.1016/j.gene.2011.10.021. Epub 2011 Oct, 25. PMID:22044478 doi:10.1016/j.gene.2011.10.021
↑ Tanley SW, Schreurs AM, Kroon-Batenburg LM, Helliwell JR. Room-temperature X-ray diffraction studies of cisplatin and carboplatin binding to His15 of HEWL after prolonged chemical exposure. Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Nov 1;68(Pt 11):1300-6., doi: 10.1107/S1744309112042005. Epub 2012 Oct 26. PMID:23143236 doi:http://dx.doi.org/10.1107/S1744309112042005

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4g4h"

@@ Line 1: / Line 1: @@
 ==100K X-ray diffraction study of carboplatin binding to HEWL in DMSO media after 13 months of crystal storage==
 <StructureSection load='4g4h' size='340' side='right' caption='[[4g4h]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4dd0|4dd0]], [[4dd1|4dd1]], [[4dd2|4dd2]], [[4dd3|4dd3]], [[4dd4|4dd4]], [[4dd6|4dd6]], [[4dd7|4dd7]], [[4dd9|4dd9]], [[4dda|4dda]], [[4ddb|4ddb]], [[4ddc|4ddc]], [[4g49|4g49]], [[4g4a|4g4a]], [[4g4b|4g4b]], [[4g4c|4g4c]]</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='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=4g4h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4g4h OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4g4h RCSB], [http://www.ebi.ac.uk/pdbsum/4g4h 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=4g4h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4g4h OCA], [http://pdbe.org/4g4h PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4g4h RCSB], [http://www.ebi.ac.uk/pdbsum/4g4h PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4g4h ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 19: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4g4h" style="background-color:#fffaf0;"></div>
 ==See Also==

4g4h

From Proteopedia

Revision as of 21:31, 4 August 2016

100K X-ray diffraction study of carboplatin binding to HEWL in DMSO media after 13 months of crystal storage

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

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