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
-
chlorophyl
- thylakoids
- chloroplast
-
light-harvesting
- cyanobacterium
- antenna
- spinach
- synechocystis
- synechococcus
- chlamydomonas
-
photochemical
-
photoinhibition
- plastoquinone
-
light-induced
- ferredoxins
- reinhardtii
-
photoautotrophic
-
non-photochemical
- methylviologen
-
pump-probe
- phycobilisomes
-
thermoluminescence
-
supercomplexes
-
pigment-protein
-
chlorophyll-proteins
- photooxidation
-
oxygen-evolving
- lhcii
-
photocurrent
-
3-3,4-dichlorophenyl-1,1-dimethylurea
-
grana
-
water-splitting
-
intersystem
-
photoprotection
- phylloquinone
-
excitonic
-
light-driven
-
photoreduced
-
photoinhibitory
-
photoreduction
- thermosynechococcus
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far-red
-
picosecond
-
flash-induced
- violaxanthin
-
electrochromic
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photophosphorylation
- elongatus
-
photochemistry
Reaction
Synonyms
OsCRR6, photosystem I P700 chlorophyll a apoprotein A2, PS I, PS-I, PS-I complex, PsaB, PsaF, PSI, PSI core complex
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Temperature Stability
Temperature Stability on EC 1.97.1.12 - photosystem I
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20 - 100
Thermosynechococcus vestitus
analysis of thermostability of oligomeric PSI complexes. The thermal profile of the spectral shift of alpha-helices bands confirms the same two temperature intervals for PSI monomers and only one interval for trimers. Spectra at 20-100°C show distinct changes in the Amide I region of PSI complexes as a function of the rising temperature. Absorbance at the Amide I maximum of PSI monomers, gradually drops in two temperature intervals, i.e. 60-75°C and 80-90°C. In contrast, absorbance at the Amide I maximum of PSI trimers drops only in one temperature interval 80-95°C. Spectral changes of PSI trimers and monomers heated up to 100°C are irreversible due to protein denaturation and non-specific aggregation of complexes leading to new absorption bands. Thermal denaturation profiles, detailed overview, The enzyme shows denaturation at the monomer-monomer-interface at over 60°C, and denaturation/aggregation at the trimer-lipid interface at over 80°C. Oligomerization is one strategy to increase thermostability of PSI complexes
additional information
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a group of short amphiphilic peptides improve the thermal stability of the multi-domain protein complex photosystem-I in aqueous solution. Ac-I5K2-CONH2 shows the best stabilizing effect by enhancing the melting temperature of PS-I from 48°C to 53°C at concentration of 0.65 mM and extending the half life of isolated PS-I significantly