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Assembly of a heter...
Assembly of a heterodinuclear Mn/Fe cofactor is coupled to tyrosine-valine ether cross-link formation in the R2-like ligand-binding oxidase
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- Griese, Julia J. (author)
- Uppsala universitet,Stockholms universitet,Institutionen för biokemi och biofysik,Uppsala University, Sweden,Strukturbiologi,Stockholm Univ, Dept Biochem & Biophys, S-10691 Stockholm, Sweden
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- Kositzki, Ramona (author)
- Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany
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- Haumann, Michael (author)
- Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany
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- Högbom, Martin (author)
- Stockholms universitet,Institutionen för biokemi och biofysik,Stockholm Univ, Dept Biochem & Biophys, S-10691 Stockholm, Sweden
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(creator_code:org_t)
- 2019-01-28
- 2019
- English.
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In: Journal of Biological Inorganic Chemistry. - : Springer Science and Business Media LLC. - 0949-8257 .- 1432-1327. ; 24:2, s. 211-221
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Abstract
Subject headings
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- R2-like ligand-binding oxidases (R2lox) assemble a heterodinuclear Mn/Fe cofactor which performs reductive dioxygen (O-2) activation, catalyzes formation of a tyrosine-valine ether cross-link in the protein scaffold, and binds a fatty acid in a putative substrate channel. We have previously shown that the N-terminal metal binding site 1 is unspecific for manganese or iron in the absence of O-2, but prefers manganese in the presence of O-2, whereas the C-terminal site 2 is specific for iron. Here, we analyze the effects of amino acid exchanges in the cofactor environment on cofactor assembly and metalation specificity using X-ray crystallography, X-ray absorption spectroscopy, and metal quantification. We find that exchange of either the cross-linking tyrosine or the valine, regardless of whether the mutation still allows cross-link formation or not, results in unspecific manganese or iron binding at site 1 both in the absence or presence of O-2, while site 2 still prefers iron as in the wild-type. In contrast, a mutation that blocks binding of the fatty acid does not affect the metal specificity of either site under anoxic or aerobic conditions, and cross-link formation is still observed. All variants assemble a dinuclear trivalent metal cofactor in the aerobic resting state, independently of cross-link formation. These findings imply that the cross-link residues are required to achieve the preference for manganese in site 1 in the presence of O-2. The metalation specificity, therefore, appears to be established during the redox reactions leading to cross-link formation.
Subject headings
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Strukturbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Structural Biology (hsv//eng)
Keyword
- Di-metal carboxylate protein
- Ferritin
- Ribonucleotide reductase
- R2-like ligand-binding oxidase
- X-ray crystallography
Publication and Content Type
- ref (subject category)
- art (subject category)
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