Solar hydrogen-producing bionanodevice outperforms natural photosynthesis.
Proc Natl Acad Sci U S A
; 108(52): 20988-91, 2011 Dec 27.
Article
em En
| MEDLINE
| ID: mdl-22160679
ABSTRACT
Although a number of solar biohydrogen systems employing photosystem I (PSI) have been developed, few attain the electron transfer throughput of oxygenic photosynthesis. We have optimized a biological/organic nanoconstruct that directly tethers F(B), the terminal [4Fe-4S] cluster of PSI from Synechococcus sp. PCC 7002, to the distal [4Fe-4S] cluster of the [FeFe]-hydrogenase (H(2)ase) from Clostridium acetobutylicum. On illumination, the PSI-[FeFe]-H(2)ase nanoconstruct evolves H(2) at a rate of 2,200 ± 460 µmol mg chlorophyll(-1) h(-1), which is equivalent to 105 ± 22 e(-)PSI(-1) s(-1). Cyanobacteria evolve O(2) at a rate of approximately 400 µmol mg chlorophyll(-1) h(-1), which is equivalent to 47 e(-)PSI(-1) s(-1), given a PSI to photosystem II ratio of 1.8. The greater than twofold electron throughput by this hybrid biological/organic nanoconstruct over in vivo oxygenic photosynthesis validates the concept of tethering proteins through their redox cofactors to overcome diffusion-based rate limitations on electron transfer.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fotossíntese
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Energia Solar
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Nanotecnologia
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Synechococcus
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Clostridium acetobutylicum
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Nanoestruturas
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Hidrogênio
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Estados Unidos