Beckerson, Penny and Reeder, Brandon J and Wilson, Michael T (2015) Coupling of disulfide bond and distal histidine dissociation in human ferrous cytoglobin regulates ligand binding. FEBS Letters, 589 (4). pp. 507-512. DOI https://doi.org/10.1016/j.febslet.2015.01.010
Beckerson, Penny and Reeder, Brandon J and Wilson, Michael T (2015) Coupling of disulfide bond and distal histidine dissociation in human ferrous cytoglobin regulates ligand binding. FEBS Letters, 589 (4). pp. 507-512. DOI https://doi.org/10.1016/j.febslet.2015.01.010
Beckerson, Penny and Reeder, Brandon J and Wilson, Michael T (2015) Coupling of disulfide bond and distal histidine dissociation in human ferrous cytoglobin regulates ligand binding. FEBS Letters, 589 (4). pp. 507-512. DOI https://doi.org/10.1016/j.febslet.2015.01.010
Abstract
<jats:p>Earlier kinetics studies on cytoglobin did not assign functional properties to specific structural forms. Here, we used defined monomeric and dimeric forms and cysteine mutants to show that an intramolecular disulfide bond (C38–C83) alters the dissociation rate constant of the intrinsic histidine (H81) (∼1000 fold), thus controlling binding of extrinsic ligands. Through time‐resolved spectra we have unequivocally assigned CO binding to hexa‐ and penta‐coordinate forms and have made direct measurement of histidine rebinding following photolysis. We present a model that describes how the cysteine redox state of the monomer controls histidine dissociation rate constants and hence extrinsic ligand binding.</jats:p>
Item Type: | Article |
---|---|
Uncontrolled Keywords: | Cytoglobin; Carbon monoxide; Flash photolysis; Ferrous; Biphasic; Distal histidine; Monomer; Dimer; Disulfide; Cysteine |
Subjects: | Q Science > Q Science (General) |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 23 Mar 2015 13:10 |
Last Modified: | 07 Aug 2024 19:53 |
URI: | http://repository.essex.ac.uk/id/eprint/13374 |
Available files
Filename: Coupling%20of%20disulfide%20bond%20-%20beckerson%20et%20al-%20FEBS%20final.pdf