4UWN image
Entry Detail
PDB ID:
4UWN
Keywords:
Title:
Lysozyme soaked with a ruthenium based CORM with a methione oxide ligand (complex 6b)
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2014-08-13
Release Date:
2014-12-10
Method Details:
Experimental Method:
Resolution:
1.67 Å
R-Value Free:
0.21
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 43 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:LYSOZYME C
Chain IDs:A
Chain Length:129
Number of Molecules:1
Biological Source:GALLUS GALLUS
Primary Citation
A Contribution to the Rational Design of Ru(Co)3Cl2L Complexes for in Vivo Delivery of Co.
Dalton Trans 44 5058 ? (2015)
PMID: 25427784 DOI: 10.1039/C4DT02966F

Abstact

A few ruthenium based metal carbonyl complexes, e.g. CORM-2 and CORM-3, have therapeutic activity attributed to their ability to deliver CO to biological targets. In this work, a series of related complexes with the formula [Ru(CO)3Cl2L] (L = DMSO (3), L-H3CSO(CH2)2CH(NH2)CO2H) (6a); D,L-H3CSO(CH2)2CH(NH2)CO2H (6b); 3-NC5H4(CH2)2SO3Na (7); 4-NC5H4(CH2)2SO3Na (8); PTA (9); DAPTA (10); H3CS(CH2)2CH(OH)CO2H (11); CNCMe2CO2Me (12); CNCMeEtCO2Me (13); CN(c-C3H4)CO2Et) (14)) were designed, synthesized and studied. The effects of L on their stability, CO release profile, cytotoxicity and anti-inflammatory properties are described. The stability in aqueous solution depends on the nature of L as shown using HPLC and LC-MS studies. The isocyanide derivatives are the least stable complexes, and the S-bound methionine oxide derivative is the more stable one. The complexes do not release CO gas to the headspace, but release CO2 instead. X-ray diffraction of crystals of the model protein Hen Egg White Lysozyme soaked with 6b (4UWN) and 8 (4UWN) shows the addition of Ru(II)(CO)(H2O)4 at the His15 binding site. Soakings with 7(4UWN) produced the metallacarboxylate [Ru(COOH)(CO)(H2O)3](+) bound to the His15 site. The aqueous chemistry of these complexes is governed by the water-gas shift reaction initiated with the nucleophilic attack of HO(-) on coordinated CO. DFT calculations show this addition to be essentially barrierless. The complexes have low cytotoxicity and low hemolytic indices. Following i.v. administration of CORM-3, the in vivo bio-distribution of CO differs from that obtained with CO inhalation or with heme oxygenase stimulation. A mechanism for CO transport and delivery from these complexes is proposed.

Legend

Protein

Chemical

Disease

Primary Citation of related structures