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Reaction of S-cerev...
Reaction of S-cerevisiae mitochondria with ligands : Kinetics of CO and O-2 binding to flavohemoglobin and cytochrome c oxidase
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- Björck, Markus L. (författare)
- Stockholms universitet,Institutionen för biokemi och biofysik
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- Zhou, Shu (författare)
- Stockholms universitet,Institutionen för biokemi och biofysik
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- Rydström Lundin, Camilla (författare)
- Stockholms universitet,Institutionen för biokemi och biofysik
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- Ott, Martin (författare)
- Stockholms universitet,Institutionen för biokemi och biofysik
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- Ädelroth, Pia (författare)
- Stockholms universitet,Institutionen för biokemi och biofysik
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- Brzezinski, Peter (författare)
- Stockholms universitet,Institutionen för biokemi och biofysik
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(creator_code:org_t)
- Elsevier BV, 2017
- 2017
- Engelska.
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Ingår i: Biochimica et Biophysica Acta - Bioenergetics. - : Elsevier BV. - 0005-2728 .- 1879-2650. ; 1858:2, s. 182-188
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Kinetic methods used to investigate electron and proton transfer within cytochrome c oxidase (CytcO) are often based on the use of light to dissociate small ligands, such as CO, thereby initiating the reaction. Studies of intact mitochondria using these methods require identification of proteins that may bind CO and determination of the ligand-binding kinetics. In the present study we have investigated the kinetics of CO-ligand binding to S. cerevisiae mitochondria and cellular extracts. The data indicate that CO binds to two proteins, CytcO and a (yeast) flavohemoglobin (yHb). The latter has been shown previously to reside in both the cell cytosol and the mitochondrial matrix. Here, we found that yHb resides also in the intermembrane space and binds CO in its reduced state. As observed previously, we found that the yHb population in the mitochondrial matrix binds CO, but only after removal of the inner membrane. The mitochondrial yHb (in both the intermembrane space and the matrix) recombines with CO with T congruent to 270 ms, which is significantly slower than observed with the cytosolic yHb (main component T congruent to 1.3 ms). The data indicate that the yHb populations in the different cell compartments differ in structure.
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Nyckelord
- Electron transfer
- Cytochrome aa(3)
- Yeast
- Membrane protein
- Ligand
- Kinetics
- Mechanism
- Biochemistry
- biokemi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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