Structure of PDB 6fos Chain B

Receptor sequence

>6fosB (length=724) Species: 280699 (Cyanidioschyzon merolae strain 10D)

FSQALASDPTTRRIWYGIATAHDFESHDGMTEENLYQKIFASHFGHLAII
FLWTSGNLFHVAWQGNFEQWVANPLKTKPLAHAIWDPHFGQAALKAFTRG
DTVANISYSGVYHWWYTIGIRNNVELYTGALGLLVLSAVFLLAGWLHIQP
KFKPSLSWFKNNESRLNHHLAGLFGVSSLAWTGHLVHVAIPASRGQHVGW
DNFIMTPPHPAGLQPFFTGNWSVYAQSPDSMQHVFGTSQGAGTAILTFLG
GFHPQTQSLWLTDMAHHHLAIAVIFIVAGHMYRTNFGIGHNLKTILEAHR
PPSGRLGKGHIGIYQTLTNSLHFQLGLALASLSVVTSLVAQHMYAMPPYA
YMAFDYVTQSALYTHHQYIAGLLIVGAFAHGAIFFIRDYDPEQNQDNVLA
RMLAHKEAVISHLSWVSLFLGFHTLGLYVHNDVVVAFGNPEKQILIEPIF
AQWIQATSGKMLYGFQVLLSSSTSNASVAAQQLWLPGWLEAVNNESNSLF
LTIGPGDFLVHHAIALGLHTTTLILVKGALDARGSKLMPDKKDFGYSFPC
DGPGRGGTCDISAWDAFYLAMFWMLNTIGWVTFYWHWKHLSLWQGNVAQF
NESSTYLMGWLRDYLWLNSSPLINGYNPYGMNSLAVWSWMFLFAHLVWAT
GFMFLISWRGYWQELIETLAWAHERTPLANLIRWKDKPVALSIVQARLVG
LVHFTVGYILTYAAFVIASTAGKF

3D structure

• PDB: 6fos Structure and function of photosystem I in Cyanidioschyzon merolae.
• Chain: B
• Resolution: 4.0 Å

Enzymatic activity

• Enzyme Commision number: 1.97.1.12: photosystem I.

Interaction with ligand

Site #	Ligand	Ligand chain	Binding residues on receptor (original residue number in PDB)	Binding residues on receptor (residue number reindexed from 1)	Binding affinity
BS01	CLA	B	L432 V436 D439 W580 N583 W587 L614	L425 V429 D432 W573 N576 W580 L607
BS02	CLA	B	S424 L425 G428 F429 I531 L576 F579 W580	S417 L418 G421 F422 I524 L569 F572 W573
BS03	SF4	B	C557 T565 C566	C550 T558 C559
BS04	CLA	B	F590 L622 S626 H652 W655 Y715 T718 Y719 F722	F583 L615 S619 H645 W648 Y708 T711 Y712 F715
BS05	CLA	B	W655 A656	W648 A649
BS06	CLA	B	A656 T657 F659 M660 I663 Y668 W669	A649 T650 F652 M653 I656 Y661 W662
BS07	CLA	B	A28 H29	A21 H22
BS08	CLA	B	I46 S49 H50 H53 L332	I39 S42 H43 H46 L325
BS09	CLA	B	G63 F66	G56 F59
BS10	CLA	B	G117 V118 W644	G110 V111 W637
BS11	CLA	B	D93 H95 F96 V643	D86 H88 F89 V636
BS12	CLA	B	H67 A88 H89 S114 Y115 S116	H60 A81 H82 S107 Y108 S109
BS13	CLA	B	H154 W165	H147 W158
BS14	CLA	B	F47 W165 R172 H176 L180	F40 W158 R165 H169 L173
BS15	CLA	B	H191 V195 W207	H184 V188 W200
BS16	CLA	B	D270 H273 A277	D263 H266 A270
BS17	CLA	B	W121 W188 D270 M271 H274 H275	W114 W181 D263 M264 H267 H268
BS18	CLA	B	N174 H175 A178 H287 R290	N167 H168 A171 H280 R283
BS19	CLA	B	H287 M288 T291 N292	H280 M281 T284 N285
BS20	CLA	B	L173 S338	L166 S331
BS21	CLA	B	S344 I381 L525	S337 I374 L518
BS22	CLA	B	L345 H349	L338 H342
BS23	CLA	B	W60 V118 A368 T371 H372 Y375 I716	W53 V111 A361 T364 H365 Y368 I709
BS24	CLA	B	W60 T61 W121 W122 T343 Y356 H372 H373 I376	W53 T54 W114 W115 T336 Y349 H365 H366 I369
BS25	CLA	B	A26 H29 D30 L379 V382 G383 H387 I390 Y553 F574 M578	A19 H22 D23 L372 V375 G376 H380 I383 Y546 F567 M571
BS26	CLA	B	M409 H412 V416 H419	M402 H405 V409 H412
BS27	CLA	B	W422 F426 F429 H430	W415 F419 F422 H423
BS28	CLA	B	G433 V436 H437 V440 K449	G426 V429 H430 V433 K442
BS29	CLA	B	Y351 I461 H518 Y591 W592	Y344 I454 H511 Y584 W585
BS30	CLA	B	L427 P455 F457 F515	L420 P448 F450 F508
BS31	CLA	B	L420 L525 H526	L413 L518 H519
BS32	CLA	B	L676 I689	L669 I682
BS33	CLA	B	W691 P695	W684 P688
BS34	CLA	B	F661 V706 H710	F654 V699 H703
BS35	PQN	B	M660 F661 S664 W665 R666 W669 A697 L698	M653 F654 S657 W658 R659 W662 A690 L691

Gene Ontology

Molecular Function

• GO:0000287 magnesium ion binding
• GO:0009055 electron transfer activity
• GO:0016168 chlorophyll binding
• GO:0016491 oxidoreductase activity
• GO:0046872 metal ion binding
• GO:0051539 4 iron, 4 sulfur cluster binding

Biological Process

• GO:0015979 photosynthesis

Cellular Component

• GO:0009507 chloroplast
• GO:0009522 photosystem I
• GO:0009535 chloroplast thylakoid membrane
• GO:0009579 thylakoid
• GO:0016020 membrane

External links

• PDB: RCSB:6fos, PDBe:6fos, PDBj:6fos
• PDBsum: 6fos
• PubMed: 29582227
• UniProt: Q85FY6|PSAB_CYAM1 Photosystem I P700 chlorophyll a apoprotein A2 (Gene Name=psaB)