Photochemistry of iron and ruthenium carbonyl complexes: evidence for light-induced loss of carbon monoxide and reductive elimination of triethylsilane from cis-mer-HM(SiEt3)(CO)3(PPh3)

1984 ◽  
Vol 3 (10) ◽  
pp. 1449-1457 ◽  
Author(s):  
David K. Liu ◽  
Cynthia G. Brinkley ◽  
Mark S. Wrighton
Keyword(s):  
Carbon Monoxide ◽  
Reductive Elimination ◽  
Carbonyl Complexes ◽  
Ruthenium Carbonyl

scholarly journals Mycobacteria tolerate carbon monoxide by remodelling their respiratory chain

2020 ◽  
Author(s):  
Katherine Bayly ◽  
Paul R. F. Cordero ◽  
Cheng Huang ◽  
Ralf B. Schittenhelm ◽  
Rhys Grinter ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Respiratory Chain ◽  
Mycobacterium Smegmatis ◽  
Physiological Response ◽  
Antibacterial Agent ◽  
Growth Parameters ◽  
Toxic Effects ◽  
Growth Defect ◽  
Carbonyl Complexes ◽  
Functional Changes

AbstractCarbon monoxide (CO) is a gas infamous for its acute toxicity. The toxicity of CO predominantly stems from its tendency to form carbonyl complexes with transition metals, thus inhibiting the heme-prosthetic groups of proteins, including the terminal oxidases of the respiratory chain. While CO has been proposed as an antibacterial agent, the evidence supporting its toxicity towards bacteria is equivocal, and its cellular targets remain poorly defined. In this work, we investigate the physiological response of mycobacteria to CO. We show that Mycobacterium smegmatis is highly resistant to the toxic effects of CO, exhibiting normal growth parameters when cultured in its presence. We profiled the proteome of M. smegmatis during growth in CO, identifying strong induction of cytochrome bd oxidase and members of the dos regulon, but relatively few other changes. We show that the activity of cytochrome bd oxidase is resistant to CO, whereas cytochrome bcc-aa3 oxidase is strongly inhibited by this gas. Consistent with these findings, growth analysis shows that M. smegmatis lacking cytochrome bd oxidase displays a significant growth defect in the presence of CO, while induction of the dos regulon appears to be unimportant for adaption to CO. Altogether, our findings suggest that M. smegmatis has considerable resistance to CO and benefits from respiratory flexibility to withstand its inhibitory effects.ImportanceCarbon monoxide has an infamous reputation as a toxic gas and it has been suggested that it has potential as an antibacterial agent. Despite this, the means by which bacteria resist its toxic effects are not well understood. In this study we determine the physiological response of Mycobacterium smegmatis to growth in CO. We show for the first time that the cytochrome bd oxidase is inherently resistant to CO and is deployed by M. smegmatis to tolerate the presence of this gas. Further, we show that aside from this remodelling of its respiratory chain, M. smegmatis makes few other functional changes to its proteome, suggesting it has a high level of inherent resistance to CO.

Studies of Carbon Monoxide Release from Ruthenium(II) Bipyridine Carbonyl Complexes upon UV-Light Exposure

2017 ◽  
Vol 56 (10) ◽  
pp. 5941-5952 ◽  
Author(s):  
Manja Kubeil ◽  
Robbin R. Vernooij ◽  
Clemens Kubeil ◽  
Bayden R. Wood ◽  
Bim Graham ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Uv Light ◽  
Light Exposure ◽  
Carbonyl Complexes
Sign in / Sign up

Export Citation Format

Share Document