1.97.1.12: photosystem I
This is an abbreviated version!
For detailed information about photosystem I, go to the full flat file.
Word Map on EC 1.97.1.12
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1.97.1.12
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photosystems
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chlorophyl
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thylakoids
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chloroplast
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light-harvesting
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cyanobacterium
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antenna
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spinach
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synechocystis
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synechococcus
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chlamydomonas
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photochemical
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photoinhibition
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plastoquinone
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light-induced
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ferredoxins
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reinhardtii
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photoautotrophic
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non-photochemical
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methylviologen
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pump-probe
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phycobilisomes
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thermoluminescence
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supercomplexes
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pigment-protein
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chlorophyll-proteins
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photooxidation
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oxygen-evolving
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lhcii
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photocurrent
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3-3,4-dichlorophenyl-1,1-dimethylurea
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grana
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water-splitting
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intersystem
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photoprotection
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phylloquinone
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excitonic
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light-driven
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photoreduced
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photoinhibitory
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photoreduction
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thermosynechococcus
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far-red
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picosecond
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flash-induced
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violaxanthin
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electrochromic
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photophosphorylation
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elongatus
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photochemistry
- 1.97.1.12
- photosystems
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chlorophyl
- thylakoids
- chloroplast
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light-harvesting
- cyanobacterium
- antenna
- spinach
- synechocystis
- synechococcus
- chlamydomonas
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photochemical
-
photoinhibition
- plastoquinone
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light-induced
- ferredoxins
- reinhardtii
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photoautotrophic
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non-photochemical
- methylviologen
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pump-probe
- phycobilisomes
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thermoluminescence
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supercomplexes
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pigment-protein
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chlorophyll-proteins
- photooxidation
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oxygen-evolving
- lhcii
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photocurrent
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3-3,4-dichlorophenyl-1,1-dimethylurea
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grana
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water-splitting
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intersystem
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photoprotection
- phylloquinone
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excitonic
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light-driven
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photoreduced
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photoinhibitory
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photoreduction
- thermosynechococcus
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far-red
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picosecond
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flash-induced
- violaxanthin
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electrochromic
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photophosphorylation
- elongatus
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photochemistry
Reaction
Synonyms
OsCRR6, photosystem I P700 chlorophyll a apoprotein A2, PS I, PS-I, PS-I complex, PsaB, PsaF, PSI, PSI core complex
ECTree
1.97.1.12 photosystem IAdvanced search results
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results (Engineering
Engineering on EC 1.97.1.12 - photosystem I
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PROTEIN VARIANTS 
ORGANISM
UNIPROT
COMMENTARY 
LITERATURE
D612H/E613H
mutation in subunit PsaB of photosystem I. Photosystem I harboring the has a high affinity toward binding of the electron donors and possesses an altered pH dependence of electron transfer with plastocyanin and cytochrome c6. The mutant strain exhibits a strong light sensitive growth phenotype, indicating that decelerated turnover between plastocyanin/cytochrome c6 and photosystem I with respect to electron transfer is deleterious to the cells
F689N
site-directed mutagenesis of subunit PsaA, the mutation causes in an about 100fold decrease in the observed rate of cofactor phylloquinone PhQA- oxidation, resulting in a lifetime that exceeds that of the terminal electron donor, P700+. This situation allows a second photochemical charge separation event to be initiated before PhQA- has decayed, thereby mimicking in PSI a situation that occurs in type II reaction centers. Simulation of the pump-pump kinetics in PsaA-F689N, overview
N591L
site-directed mutagenesis of psaB, the mutant shows structural differences and altered activity compared to the wild-type enzyme, detailed overview
N604L
site-directed mutagenesis of psaA, the mutant shows structural differences and altered activity compared to the wild-type enzyme, detailed overview
F689N
Chlamydomonas reinhardtii KRC91-1A
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site-directed mutagenesis of subunit PsaA, the mutation causes in an about 100fold decrease in the observed rate of cofactor phylloquinone PhQA- oxidation, resulting in a lifetime that exceeds that of the terminal electron donor, P700+. This situation allows a second photochemical charge separation event to be initiated before PhQA- has decayed, thereby mimicking in PSI a situation that occurs in type II reaction centers. Simulation of the pump-pump kinetics in PsaA-F689N, overview
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F647C
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mutant strain cannot grow under photoautotrophic conditions because of low photosystem I activity, possibly due to low levels of proteins
F649C/G650I
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mutant strain cannot grow under photoautotrophic conditions because of low photosystem I activity, possibly due to low levels of proteins
H651C/L652M
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mutant strain cannot grow under photoautotrophic conditions because of low photosystem I activity, possibly due to low levels of proteins
S641C/V642I
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mutation in subunit PsaB. Mutant strain grows photoautotrophically and shows no obvious reduction in the photosystem I activity. Kinetics of P700 re-reduction by plastocyanin remains unaltered
W643C/A644I
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mutation in subunit PsaB. Mutant strain grows photoautotrophically and shows no obvious reduction in the photosystem I activity. Kinetics of P700 re-reduction by plastocyanin remains unaltered
W645C
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mutation in subunit PsaB. Mutant strain grows photoautotrophically and shows no obvious reduction in the photosystem I activity. Kinetics of P700 re-reduction by plastocyanin remains unaltered
N591L
site-directed mutagenesis of psaB, the mutant shows structural differences and altered activity compared to the wild-type enzyme, detailed overview
N604L
site-directed mutagenesis of psaA, the mutant shows structural differences and altered activity compared to the wild-type enzyme, detailed overview
additional information
additional information
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generation of Arabidopsis thaliana whirly1 knockout (kowhy1) and plastid-localized WHIRLY1 overexpression (oepWHY1) plants. The WHY1 knockout line (kowhy1) has a T-DNA insertion in exon1. Loss of WHIRLY1 leads to a higher photochemical quantum yield of photosystem I Y(I) and electron transport rate and a lower non-photochemical quenching involved in the thermal dissipation of excitation energy of chlorophyll fluorescence than the wild-type. Higher Y(I) in kowhy1 mutant demonstrates an elevated redox rate of P700 caused by the lack of WHY1 at an early stage of leaf senescence. Under high light conditions, both kowhy1 and ko1/3 plants show lower electron transport rate than wild-type which are contrary to that under normal light condition. Moreover, the expression of several PSI-NDH encoding genes and ERF109, which is related to jasmonate response, varies in kowhy1 under different light conditions. Mutation of WHY1 leads to the increased expression level of ERF109 and ERF13 compared to wild-type plants in response to high light treatment. ERF13 is a CE1 (coupling element 1) binding protein and confers ABA hypersensitivity in Arabidopsis thaliana
additional information
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generation of Arabidopsis thaliana whirly1 knockout (kowhy1) and plastid-localized WHIRLY1 overexpression (oepWHY1) plants. The WHY1 knockout line (kowhy1) has a T-DNA insertion in exon1. Loss of WHIRLY1 leads to a higher photochemical quantum yield of photosystem I Y(I) and electron transport rate and a lower non-photochemical quenching involved in the thermal dissipation of excitation energy of chlorophyll fluorescence than the wild-type. Higher Y(I) in kowhy1 mutant demonstrates an elevated redox rate of P700 caused by the lack of WHY1 at an early stage of leaf senescence. Under high light conditions, both kowhy1 and ko1/3 plants show lower electron transport rate than wild-type which are contrary to that under normal light condition. Moreover, the expression of several PSI-NDH encoding genes and ERF109, which is related to jasmonate response, varies in kowhy1 under different light conditions. Mutation of WHY1 leads to the increased expression level of ERF109 and ERF13 compared to wild-type plants in response to high light treatment. ERF13 is a CE1 (coupling element 1) binding protein and confers ABA hypersensitivity in Arabidopsis thaliana
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additional information
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generation of the rice mutant defective in the OsCRR6 gene by the Tos17 retrotransposon insertion
additional information
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molecular analysis of spontaneous revertants from the mutants H651C/L652M, F649C/G650I and F647C suggests that an aromatic residue at F647 and a small residue at G650 may be necessary for maintaining the structural integrity of photosystem I
additional information
the menB deletion strain carries a mutation in the PhQ biosynthetic pathway, charge recombination kinetics in the PS I complexes from menB mutant, which binds either PQ or Cl2NQ instead of the native PhQ in the A1 binding site of the wild-type PS I, overview
