Artificial Metalloproteins Containing Co4O4 Cubane Active Sites

被引:35
|
作者
Olshansky, Lisa [1 ]
Huerta-Lavorie, Raul [2 ]
Nguyen, Andy I. [2 ]
Vallapurackal, Jaicy [1 ]
Furst, Ariel [2 ]
Tilley, T. Don [2 ,3 ]
Borovik, A. S. [1 ]
机构
[1] Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA
[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[3] Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA
关键词
OXYGEN-EVOLVING CATALYST; WATER OXIDATION CATALYSTS; EVOLUTION REACTION; PHOTOSYSTEM-II; TERMINAL OXO; NEUTRAL PH; COBALT; INTERMEDIATE; CO(IV); MECHANISM;
D O I
10.1021/jacs.7b13052
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Artificial metalloproteins (ArMs) containing Co4O4 cubane active sites were constructed via biotin-streptavidin technology. Stabilized by hydrogen bonds (H-bonds), terminal and cofacial Co-III-OH2 moieties are observed crystallographically in a series of immobilized cubane sites. Solution electrochemistry provided correlations of oxidation potential and pH. For variants containing Ser and Phe adjacent to the metallocofactor, 1e(-)/1H(+) chemistry predominates until pH 8, above which the oxidation becomes pH-independent. Installation of Tyr proximal to the Co4O4 active site provided a single H-bond to one of a set of cofacial Co-III-OH2 groups. With this variant, multi-e(-)/multi-H+ chemistry is observed, along with a change in mechanism at pH 9.5 that is consistent with Tyr deprotonation. With structural similarities to both the oxygen-evolving complex of photosystem II (H-bonded Tyr) and to thin film water oxidation catalysts (Co4O4 core), these findings bridge synthetic and biological systems for water oxidation, highlighting the importance of secondary sphere interactions in mediating multi-e(-)/multi-H+ reactivity.
引用
收藏
页码:2739 / 2742
页数:4
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