Increased heme oxygenase1 expression during copper
The activity of hepatic heme oxygenase HO in rats is elevated in response to copper deficiency. However, the mechanism responsible for the increase in HO activity is poorly understood. Oxidative stress is a common denominator for many of the signals that induce HO1, the inducible isoform of HO. T
Specific expression and function of the Atype cytochrome c
The bacterial Atype aa 3type cytochrome c oxidase is a member of the hemecopper oxidase superfamily and is closely related to the mitochondrial terminal oxidase . This enzyme comprises of three core subunits and it alyzes four electron reduction of oxygen to water at the end of the respiratory chain.
The Unusual Homodimer of a HemeCopper Terminal Oxidase
The hemecopper oxidase superfamily comprises cytochrome c and ubiquinol oxidases. These enzymes alyze the transfer of electrons from different electron donors onto molecular oxygen. A Bfamily cytochrome c oxidase from the hyperthermophilic bacterium Aquifex aeolicus was discovered previously to
Roles for hemecopper oxidases in extreme highlight and
The ctaCIDIEI and ctaCIIDIIEII gene clusters that encode hemecopper cytochrome oxidases have been characterized in the marine cyanobacterium Synechococcus sp. PCC 7002 and the inactivation of ctaDI was shown to affect highlight adaptation. In this study, Synechococcus sp. PCC 7002 wildtype, ctaDI
Models for HemeCopper Oxidase and Related Enzymes Kenneth
Hemecopper oxidases, including cytochrome c oxidase CcO , alyze the fourelectron, fourproton reduction of dioxygen to water, while also 39pumping 39 four protons per O2 molecule reduced across the cell membrane. The electrochemical potential gradient generated by this process ultimately provides the driving force for ATP synthesis. The key chemistry for O2binding, reduction, and coupled
ROS Defense Systems and Terminal Oxidases in Bacteria
A hemecopper oxidase usually carries three or four redox centers depending on whether it is a quinol oxidase or cytochrome c oxidase COX . In addition to the electron entry subunit that carries a binuclear Cu A center, some COXs caa 3 , cbb 3 have an additional domain, the substrate cytochrome c 44 , 45 , 46 .
Functional and regulatory analysis of the two copies of the
DNA corresponding to two copies of the Rhizobium leguminosarum bv. viciae strain VF39 fixNOQP operon coding for a putative symbiotic terminal oxidase of the hemecopper oxidase superfamily was cloned, sequenced, and genetically analyzed. The first copy is lo ed upstream of the fixKfixL region on
Structure of the cytochrome aa3600 hemecopper menaquinol
Structure of the cytochrome aa3600 hemecopper menaquinol oxidase bound to inhibitor HQNO shows TM0 is part of the quinol binding site Jingjing Xu a,1,2, Ziqiao Dingb,1, Bing Liu , Sophia M. Yib,3, Jiao Li a,2, Zhengguang Zhang , Yuchen Liua,2, Jin Lic,