6K61

Cryo-EM structure of the tetrameric photosystem I from a heterocyst-forming cyanobacterium Anabaena sp. PCC7120

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, a	Photosystem I P700 chlorophyll a apoprotein A1	polymer	752	83289.7	2	UniProt (P58576) Pfam (PF00223) In PDB	Nostoc sp. PCC 7120	PsaA
2	X, x	Photosystem I 4.8 kDa protein	polymer	44	4872.8	2	UniProt (P58566) Pfam (PF08078) In PDB	Nostoc sp. PCC 7120
3	B, b	Photosystem I P700 chlorophyll a apoprotein A2 1	polymer	741	83457.0	2	UniProt (P58565) Pfam (PF00223) In PDB	Nostoc sp. PCC 7120	PsaB 1
4	C, c	Photosystem I iron-sulfur center	polymer	81	8825.2	2	UniProt (P0A410) Pfam (PF12838) In PDB	Nostoc sp. PCC 7120	9 kDa polypeptide,PSI-C,Photosystem I subunit VII,PsaC
5	D, d	Photosystem I reaction center subunit II	polymer	139	15176.2	2	UniProt (P58573) Pfam (PF02531) In PDB	Nostoc sp. PCC 7120
6	E, e	Photosystem I reaction center subunit IV	polymer	70	7897.1	2	UniProt (P58575) Pfam (PF02427) In PDB	Nostoc sp. PCC 7120
7	F, f	Photosystem I reaction center subunit III	polymer	164	17850.6	2	UniProt (P58564) Pfam (PF02507) In PDB	Nostoc sp. PCC 7120	PSI-F
8	J, j	Photosystem I reaction center subunit IX	polymer	49	5499.4	2	UniProt (P58568) Pfam (PF01701) In PDB	Nostoc sp. PCC 7120
9	K, k	Photosystem I reaction center subunit PsaK 1	polymer	86	8852.5	2	UniProt (P58583) Pfam (PF01241) In PDB	Nostoc sp. PCC 7120	Photosystem I subunit X 1
10	I, i	Photosystem I reaction center subunit VIII	polymer	46	5066.9	2	UniProt (P58560) Pfam (PF00796) In PDB	Nostoc sp. PCC 7120
11	L, l	Photosystem I reaction center subunit XI	polymer	172	18130.7	2	UniProt (P58577) Pfam (PF02605) In PDB	Nostoc sp. PCC 7120	PSI subunit V,PSI-L
12	M, m	Photosystem I reaction center subunit XII	polymer	32	3538.2	2	UniProt (Q8YNB0) Pfam (PF07465) In PDB	Nostoc sp. PCC 7120	PSI-M
13	a, A	CHLOROPHYLL A ISOMER	non-polymer		893.5	2	Chemie (CL0)
14	A, B, a, b, f...	CHLOROPHYLL A	non-polymer		893.5	188	Chemie (CLA)
15	a, b, A, B	PHYLLOQUINONE	non-polymer		450.7	4	Chemie (PQN)
16	C, a, A, c	IRON/SULFUR CLUSTER	non-polymer		351.6	6	Chemie (SF4)
17	f, F, j, J, k...	BETA-CAROTENE	non-polymer		536.9	46	Chemie (BCR)
18	F, i, a, A	1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE	non-polymer		723.0	6	Chemie (LHG)
19	X, l, x, b	1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL	non-polymer		795.1	4	Chemie (SQD)
20	B, b	1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE	non-polymer		787.2	3	Chemie (LMG)

Contents of the asymmetric unit

Polymers	Number of chains	24
	Total formula weight	524912.6
Non-Polymers*	Number of molecules	259
	Total formula weight	208251.5
All*	Total formula weight	733164.0

*Water molecules are not included.