Structure of PDB 7yca Chain B

Receptor sequence

>7ycaB (length=732) Species: 70448 (Ostreococcus tauri)

ATKFPKFSQGLASDPTTRRIWFGIATAHDFETHDGMTEEKLYQKIFASHF
GQLAIIFLWTSGNLFHVAWQGNFEKWGEDPLHVRPIAHTIWDPHFGQPAV
EAFTRGGASAPVNIAYSGVYQWWYTIGMRTNVDLYNGSLFLLFVAGLFLF
AGWLHLQPTFAPAVSWFKNAESRLNHHLSGLFGVSSLAWTGHLVHVAIPA
SRGETVRWDNFLTTLPHPAGLAPFFTGQWAVYAQNPDTAGHIFGTSEGAG
TAILTFLGGFHPQTQSLWLTDMAHHHLAIAVVFIIAGHQYRTNFGIGHSM
KEILEAHTAPSGRLGAGHTGLFDTVNNSLHFQLGLALASVGVLCSLTAQH
MYSMPPYAFLAQDFTTQAALYSHHQYIAGFIMCGAFAHGAIFFIRDYDPE
ANKGNVLARMLEHKEAIISHLSWVSLFLGFHTLGLYVHNDVMQAFGTPEK
QILIEPVFAQWIQAAQGKALYGFDILLSGDNAATAAGNSIYLPGWLAGIN
SSTNSLFLPIGPGDFLVHHAIALGLHTTTLILVKGALDARGSKLMPDKKD
FGYSFPCDGPGRGGTCDISAWDAFYLAVFWELNTVSWTVFYFHWKHLALW
QGNSAQFDESSTYIMGWLRDYLWLNSSQLINGYNPFGMNSLSVWAWMFLF
GHLIYATGFMFLISWRGYWQELIETLVWAHERTPLANFVKWNDKPVALSI
VQARLVGLTHFAVGFVLTYAAFVIASTSGKFG

3D structure

• PDB: 7yca The photosystem I supercomplex from a primordial green alga Ostreococcus tauri harbors three light-harvesting complex trimers.
• Chain: B
• Resolution: 2.94 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	CL0	B	L619 W624	L618 W623
BS02	CLA	B	S423 S426 L427 G430 F431 L434 L531 I532 L577 F580 W581	S422 S425 L426 G429 F430 L433 L530 I531 L576 F579 W580
BS03	CLA	B	W647 L650 F651 H653 L654 A657	W646 L649 F650 H652 L653 A656
BS04	CLA	B	V442 F446	V441 F445
BS05	CLA	B	T684 P685	T683 P684
BS06	CLA	B	S420 S423 W424 L427	S419 S422 W423 L426
BS07	SF4	B	C558 G560 C567 W666 I701	C557 G559 C566 W665 I700
BS08	CLA	B	L677 H681 T684	L676 H680 T683
BS09	CLA	B	V438 D441 W581 N584 W588 I615	V437 D440 W580 N583 W587 I614
BS10	CLA	B	Y437 A521 S587 W588 F591 W618 S627 F649 H653 Y656 F716 T719 Y720 F723	Y436 A520 S586 W587 F590 W617 S626 F648 H652 Y655 F715 T718 Y719 F722
BS11	CLA	B	A657 T658 F660 M661 I664 Y669 W670	A656 T657 F659 M660 I663 Y668 W669
BS12	CLA	B	F5 F8 A28 H29 F31 Q53 I56	F4 F7 A27 H28 F30 Q52 I55
BS13	CLA	B	H29 F31 I46 S49 H50 Q53 L54 L330 H331 Q333 L334 A337	H28 F30 I45 S48 H49 Q52 L53 L329 H330 Q332 L333 A336
BS14	CLA	B	H29 Q53 I57 W60 F381 I382	H28 Q52 I56 W59 F380 I381
BS15	CLA	B	W60 G63 F66 H67 W70 Q71 H89	W59 G62 F65 H66 W69 Q70 H88
BS16	CLA	B	W60 N64 A88 H89 N114 A116 Y117 S118 W645	W59 N63 A87 H88 N113 A115 Y116 S117 W644
BS17	CLA	B	I91 W92 D93 H95 F96 N114 V644 W647	I90 W91 D92 H94 F95 N113 V643 W646
BS18	CLA	B	P94 H95	P93 H94
BS19	CLA	B	F47 F51 F149 A152 H156 F161 W167	F46 F50 F148 A151 H155 F160 W166
BS20	CLA	B	W167 S173 H177 T293	W166 S172 H176 T292
BS21	CLA	B	F47 H50 F51 L54 W123 W167 R174 H177 H178 L182 F183	F46 H49 F50 L53 W122 W166 R173 H176 H177 L181 F182
BS22	CLA	B	G128 M129 F141 A189 W190 H193 H196 V197 R208 W209 F212	G127 M128 F140 A188 W189 H192 H195 V196 R207 W208 F211
BS23	CLA	B	G192 H196 L216 P217 G221 L222 F225 Y233 L255	G191 H195 L215 P216 G220 L221 F224 Y232 L254
BS24	CLA	B	W230 A231 T256 H275 L278 V282 I491	W229 A230 T255 H274 L277 V281 I490
BS25	CLA	B	F257 G259 H275 H276 A279 H351 M355 W496	F256 G258 H274 H275 A278 H350 M354 W495
BS26	CLA	B	W123 S186 W190 M273 H276 H277 I280 L344 L347 T348 P357 Y358	W122 S185 W189 M272 H275 H276 I279 L343 L346 T347 P356 Y357
BS27	CLA	B	L179 F284 Q290 Y291 I304	L178 F283 Q289 Y290 I303
BS28	CLA	B	H177 S180 V185 H289 T293 F295	H176 S179 V184 H288 T292 F294
BS29	CLA	B	I286 H289 Q290 I297 G298 H299	I285 H288 Q289 I296 G297 H298
BS30	CLA	B	H299 A307 H308	H298 A306 H307
BS31	CLA	B	L305 H319 V407 M411	L304 H318 V406 M410
BS32	CLA	B	A171 R174 L175 H178 F183 F323 L336 S340 L344	A170 R173 L174 H177 F182 F322 L335 S339 L343
BS33	CLA	B	S346 L347 Q350 Q376 M383 F387 L526 T529 T530 E582	S345 L346 Q349 Q375 M382 F386 L525 T528 T529 E581
BS34	CLA	B	S340 V343 L347 Q350 H351 Y353 S354 M355 L507 F508	S339 V342 L346 Q349 H350 Y352 S353 M354 L506 F507
BS35	CLA	B	W60 N64 S118 A370 H374 Y377 I378 F381 V717 A721	W59 N63 S117 A369 H373 Y376 I377 F380 V716 A720
BS36	CLA	B	F58 W60 T61 G119 W123 C345 T348 M352 Y358 L371 H374 H375	F57 W59 T60 G118 W122 C344 T347 M351 Y357 L370 H373 H374
BS37	CLA	B	A26 H29 D30 H331 L334 F381 G385 H389 I392 R396 Y554 W572 F575	A25 H28 D29 H330 L333 F380 G384 H388 I391 R395 Y553 W571 F574
BS38	CLA	B	R314 L315 V407 R410 M411 H414 I418 H421	R313 L314 V406 R409 M410 H413 I417 H420
BS39	CLA	B	H421 W424	H420 W423
BS40	CLA	B	W424 F428 F431 H432	W423 F427 F430 H431
BS41	CLA	B	G435 H439 M443 K451 I453	G434 H438 M442 K450 I452
BS42	CLA	B	W462 I463 A466 Q467 L478 W496	W461 I462 A465 Q466 L477 W495
BS43	CLA	B	L477 A484 A487 Y492	L476 A483 A486 Y491
BS44	CLA	B	Q350 Y353 A460 I463 Q464 F508 L509 I511 H519 I522 T589 Y592 F593	Q349 Y352 A459 I462 Q463 F507 L508 I510 H518 I521 T588 Y591 F592
BS45	CLA	B	F428 L429 P457 F459 A460 F516 H519 H520	F427 L428 P456 F458 A459 F515 H518 H519
BS46	CLA	B	L422 A523 L526 H527	L421 A522 L525 H526
BS47	CLA	B	T18 W22 H681 K691 W692 N693 P696	T17 W21 H680 K690 W691 N692 P695
BS48	CLA	B	F651 L654 I655 T658 F662 V707 T710 H711	F650 L653 I654 T657 F661 V706 T709 H710
BS49	CLA	B	H308 T309 P311 R314 L315	H307 T308 P310 R313 L314
BS50	PQN	B	W22 M661 F662 S665 W666 R667 W670 A698 L699 A704	W21 M660 F661 S664 W665 R666 W669 A697 L698 A703
BS51	CLA	B	F459 W462	F458 W461

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:7yca, PDBe:7yca, PDBj:7yca
• PDBsum: 7yca
• PubMed: 36951548
• UniProt: Q0P3K2|PSAB_OSTTA Photosystem I P700 chlorophyll a apoprotein A2 (Gene Name=psaB)