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Table 1 High-valent Mn-oxo intermediates involved in OEC and RNR

From: Involvement of high-valent manganese-oxo intermediates in oxidation reactions: realisation in nature, nano and molecular systems

Name

Biological reaction

Resting state

High valent Intermediates

Oxygen evolving complex

H2O splitting

[Mn4CaO5(Glu)3(Asp)2(Ala)(His)]

MnIV-OË™/MnV=O

Ribonucleotide reductase (RNR Ib)

Tyrosine radical generation

[Mn II2 (Glu)3(Asp)(His)2(OH2)2] with NrdI cofactor

Diamond core MnIV-(μ-O) (μ-OH)-MnIII

Ribonucleotide reductase (RNR Ic)

Cysteine radical generation

[MnIIFeII(Glu)4(His)2]

Diamond core MnIV-(μ-O2)-FeIV

Ribonucleotide reductase (may be RNR Id)

Tyrosine radical generation

[MnIIMnII(Asp)(Glu)3(His)2] without NrdI cofactor

Diamond core MnIV-(μ-O2)-MnIII