Summary: Photosystem I reaction centre subunit IX / PsaJ
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Photosystem I reaction centre subunit IX / PsaJ Provide feedback
This family consists of the photosystem I reaction centre subunit IX or PsaJ from various organisms including Synechocystis sp. (strain pcc 6803), Pinus thunbergii (green pine) and Zea mays (maize). PsaJ P19443 is a small 4.4kDa, chloroplastal encoded, hydrophobic subunit of the photosystem I reaction complex its function is not yet fully understood . PsaJ can be cross-linked to PsaF P12356 and has a single predicted transmembrane domain it has a proposed role in maintaining PsaF in the correct orientation to allow for fast electron transfer from soluble donor proteins to P700+ .
Fischer N, Boudreau E, Hippler M, Drepper F, Haehnel W, Rochaix JD; , Biochemistry 1999;38:5546-5552.: A large fraction of PsaF is nonfunctional in photosystem I complexes lacking the PsaJ subunit. PUBMED:10220342 EPMC:10220342
Muhlenhoff U, Haehnel W, Witt H, Herrmann RG; , Gene 1993;127:71-78.: Genes encoding eleven subunits of photosystem I from the thermophilic cyanobacterium Synechococcus sp. PUBMED:8486290 EPMC:8486290
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This tab holds annotation information from the InterPro database.
InterPro entry IPR002615
Oxygenic photosynthesis uses two multi-subunit photosystems (I and II) located in the cell membranes of cyanobacteria and in the thylakoid membranes of chloroplasts in plants and algae. Photosystem II (PSII) has a P680 reaction centre containing chlorophyll 'a' that uses light energy to carry out the oxidation (splitting) of water molecules, and to produce ATP via a proton pump. Photosystem I (PSI) has a P700 reaction centre containing chlorophyll that takes the electron and associated hydrogen donated from PSII to reduce NADP+ to NADPH. Both ATP and NADPH are subsequently used in the light-independent reactions to convert carbon dioxide to glucose using the hydrogen atom extracted from water by PSII, releasing oxygen as a by-product.This family consists of the photosystem I reaction centre subunit IX or PsaJ from various organisms including Synechocystis sp. (strain PCC 6803), Pinus thunbergii (Green pine) and Zea mays (Maize). PsaJ (SWISSPROT) is a small 4.4kDa, chloroplast encoded, hydrophobic subunit of the photosystem I reaction complex whose function is not yet fully understood [PUBMED:10220342]. PsaJ can be cross-linked to PsaF (SWISSPROT) and has a single predicted transmembrane domain. It has a proposed role in maintaing PsaF in the correct orientation to allow for fast electron transfer from soluble donor proteins to P700+ [PUBMED:10220342].
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|Cellular component||photosystem I (GO:0009522)|
|Biological process||photosynthesis (GO:0015979)|
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|Seed source:||Pfam-B_1599 (release 4.1)|
|Author:||Bashton M, Bateman A|
|Number in seed:||34|
|Number in full:||1122|
|Average length of the domain:||36.80 aa|
|Average identity of full alignment:||74 %|
|Average coverage of the sequence by the domain:||83.60 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 80369284 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||14|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the PSI_PsaJ domain has been found. There are 12 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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