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Five-coordinate Mn-...
Five-coordinate Mn-IV intermediate in the activation of nature's water splitting cofactor
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- Chrysina, Maria (författare)
- Max Planck Inst Chem Energiekonvers, D-45470 Mulheim, Germany
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- Heyno, Eiri (författare)
- Ruhr Univ Bochum, Fac Biol & Biotechnol, Plant Biochem, D-44780 Bochum, Germany
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- Kutin, Yury (författare)
- Max Planck Inst Chem Energiekonvers, D-45470 Mulheim, Germany;TU Dortmund Univ, Dept Chem & Chem Biol, D-44227 Dortmund, Germany
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- Reus, Michael (författare)
- Max Planck Inst Chem Energiekonvers, D-45470 Mulheim, Germany
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- Nilsson, Håkan (författare)
- Umeå universitet,Kemiska institutionen,Umea Univ, Chem Biol Ctr, Dept Chem, S-90187 Umea, Sweden
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- Nowaczyk, Marc M. (författare)
- Ruhr Univ Bochum, Fac Biol & Biotechnol, Plant Biochem, D-44780 Bochum, Germany
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- DeBeer, Serena (författare)
- Max Planck Inst Chem Energiekonvers, D-45470 Mulheim, Germany
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- Neese, Frank (författare)
- Max Planck Inst Kohlenforsch, D-45470 Mulheim, Germany
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- Messinger, Johannes (författare)
- Uppsala universitet,Umeå universitet,Kemiska institutionen,Department of Chemistry–Ångström Laboratorium, Uppsala University, 75120 Uppsala, Sweden,Molekylär biomimetik,Umea Univ, Chem Biol Ctr, Dept Chem, S-90187 Umea, Sweden
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- Lubitz, Wolfgang (författare)
- Max Planck Inst Chem Energiekonvers, D-45470 Mulheim, Germany
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- Cox, Nicholas (författare)
- Australian Natl Univ, Res Sch Chem, Canberra, ACT 2601, Australia
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(creator_code:org_t)
- 2019-08-07
- 2019
- Engelska.
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Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 116:34, s. 16841-16846
- Relaterad länk:
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https://www.pnas.org...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Nature's water splitting cofactor passes through a series of catalytic intermediates (S-0-S-4) before O-O bond formation and O-2 release. In the second last transition (S-2 to S-3) cofactor oxidation is coupled to water molecule binding to Mn1. It is this activated, water-enriched all Mn-IV form of the cofactor that goes on to form the O-O bond, after the next light-induced oxidation to S-4. How cofactor activation proceeds remains an open question. Here, we report a so far not described intermediate (S-3') in which cofactor oxidation has occurred without water insertion. This intermediate can be trapped in a significant fraction of centers (> 50%) in (i) chemical-modified cofactors in which Ca2+ is exchanged with Sr2+; the Mn4O5Sr cofactor remains active, but the S-2-S-3 and S-3-S-0 transitions are slower than for the Mn4O5Ca cofactor; and (ii) upon addition of 3% vol/vol methanol; methanol is thought to act as a substrate water analog. The S-3' electron paramagnetic resonance (EPR) signal is significantly broader than the untreated S-3 signal (2.5 T vs. 1.5 T), indicating the cofactor still contains a 5-coordinate Mn ion, as seen in the preceding S-2 state. Magnetic double resonance data extend these findings revealing the electronic connectivity of the S-3' cofactor is similar to the high spin form of the preceding S-2 state, which contains a cuboidal Mn3O4Ca unit tethered to an external, 5-coordinate Mn ion (Mn-4). These results demonstrate that cofactor oxidation regulates water molecule insertion via binding to Mn-4. The interaction of ammonia with the cofactor is also discussed.
Ämnesord
- NATURVETENSKAP -- Kemi -- Organisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Organic Chemistry (hsv//eng)
Nyckelord
- Photosystem II
- WOC/OEC
- EPR
- EDNMR
- methanol
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Chrysina, Maria
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Heyno, Eiri
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Kutin, Yury
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Reus, Michael
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Nilsson, Håkan
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Nowaczyk, Marc M ...
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visa fler...
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DeBeer, Serena
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Neese, Frank
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Messinger, Johan ...
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Lubitz, Wolfgang
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Cox, Nicholas
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visa färre...
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- NATURVETENSKAP
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NATURVETENSKAP
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Umeå universitet
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