EC Number   |
Subunits |
Reference |
|---|
    1.97.1.12 | More |
the membrane-embedded core of each PS I monomer is formed by the two largest subunits, PsaA and PsaB, which bind electron transport cofactors arranged in two symmetrical branches, A and B, extending from P700, a pair of chlorophyll a molecules located on the lumenal side, to the [4Fe-4S] cluster FX, placed on the opposite stromal side of the complex |
745986 |
| 1.97.1.12 | More |
the photosystem I reaction center complex is composed of the 83 kDa subunits A and B, and at least six other subunits with molecular mass below 20 kDa |
712730 |
| 1.97.1.12 | More |
the photosystem I reaction center is obtained in two forms, monomeric and trimeric |
713434 |
| 1.97.1.12 | More |
the PSI core complex prepared from cucumber cotyledons contains 80 chlorophylls per reaction center (P700) and eight polypeptides with apparent molecular masses of 65/63, 20,19.5,18.5,17.5,7.6, and 5.8 kDa. The amount of 18.5 kDa polypeptide in the PSI complex affects the activity. When this polypeptide is largely depleted, the complex is almost inactive. The inactivation is due to inhibition of electron transfer from plastocyanin to photooxidized P700. Chemical cross-linking and N-terminal amino acid sequencing experiments indicate that the 18.5-kDa polypeptide is the plastocyanin-docking protein and the psaF gene product |
712315 |
| 1.97.1.12 | tetramer |
in strain TS-821 PSI forms tetrameric, dimeric, and monomeric species, a tetrameric PSI has two PSI dimers associated together with interdimer gaps, while the PSI dimer is composed of two tightly tethered PSI monomers, subunit organization, structure comparisons, overview |
746026 |
| 1.97.1.12 | trimer |
- |
745987 |
| 1.97.1.12 | trimer |
cyanobacterial PSI is usually trimeric |
744412 |
| 1.97.1.12 | trimer |
inside the trimer, subunits PsaL, PsaI and PsaM (5 alpha-helices in total) are located in the center of the trimerization domain of PSI, thereby forming most of the contacts between the monomers |
746500 |
| 1.97.1.12 | trimer |
three-dimensional structure analysis using PDB ID 1JB0, overview. Two transmembrane large protein subunits PsaA and PsaB compose C2-symmetrical heterodimeric core complex containing most of the electron transfer cofactors. The electron transfer chain of PS I consists of the primary donor-chlorophyll (Chl) dimer P700, primary acceptor A0 (four Chl molecules), A1 (two phylloquinone molecules), and iron-sulfur clusters FX, FA, and FB.The terminal FA/FB clusters are located on the small extrinsic PsaC subunit |
745985 |
