De novo design and molecular assembly of a transmembrane diporphyrin-binding protein complex.

De novo design and molecular assembly of a transmembrane diporphyrin-binding protein complex.
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DOI:
10.1021/ja107487b
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发表时间:
2010-11-10
影响因子:
15
通讯作者:
Degrado WF
Degrado WF
中科院分区:
化学1区
文献类型:
--
作者:
Korendovych IV;Senes A;Kim YH;Lear JD;Fry HC;Therien MJ;Blasie JK;Walker FA;Degrado WF

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De novo design of membrane proteins remains difficult despite recent advances in understanding the factors that drive membrane protein folding and association. We have designed a membrane protein PRIME (PoRphyrins In MEmbrane) that positions two non-natural iron diphenylporphyrin (FeIIIDPP) sufficiently close to provide a multi-centered pathway for transmembrane electron transfer. Computational methods previously used for design of multi-porphyrin water soluble helical proteins were extended to this membrane target. Four helices were arranged in a D2-symmetrical bundle to bind two Fe(II/III) diphenylporphyrins in a bis-His geometry further stabilized by second-shell hydrogen bonds. UV-vis absorbance, CD spectroscopy, analytical ultracentrifugation, redox potentiometry, and EPR demonstrate that PRIME binds cofactor with high affinity and specificity in the expected geometry.
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