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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

Reaction

reduced plastocyanin
+
oxidized ferredoxin
+
hnu
=
oxidized plastocyanin
+
reduced ferredoxin

Synonyms

OsCRR6, photosystem I P700 chlorophyll a apoprotein A2, PS I, PS-I, PS-I complex, PsaB, PsaF, PSI, PSI core complex

ECTree

     1 Oxidoreductases
         1.97 Other oxidoreductases
             1.97.1 Sole sub-subclass for oxidoreductases that do not belong in the other subclasses
                1.97.1.12 photosystem I

Temperature Stability

Temperature Stability on EC 1.97.1.12 - photosystem I

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TEMPERATURE STABILITY
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
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
-
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