Structure of PDB 6kig Chain B

Receptor sequence

>6kigB (length=733) Species: 1140 (Synechococcus elongatus PCC 7942 = FACHB-805)

ATKFPKFSQDLAQDPTTRRIWYGIATAHDFESHDGMTEENLYQKIFASHF
GHLAIIFLWVSGNLFHVAWQGNFEQWSQDPLHVRPIAHAIWDPHFGQGAI
DAFTQAGASSPVNVAYSGVYHWWYTIGMRTNGDLYQGSIFLLILSALFLF
AGWLHLQPKFRPSLSWFKNAESRLNHHLAGLFGFSSLAWTGHLVHVAIPE
ARGQHVGWDNFLSTLPHPAGLAPFFTGNWSVYAENPDTASHAFGTAEGAG
TAILTFLGGFHPQTEALWLTDIAHHHLAIAVIFIIAGHMYRTNFGIGHSI
KEILEAHKPPAGGLGAGHKGLYETLNNSLHFQLALALASLGVVTSLVAQH
MYSMPPYAFIAKDYTTMAALYTHHQYIATFIMCGAFAHGAIFLIRDYDPE
ANKNNVLARVLEHKEAIISHLSWVSLFLGFHTLGLYVHNDVVVAFGTPEK
QILIEPVFAQFVQAASGKALYGFNVLLANADSAATAASLGTYLPNWLDAI
NSGKTALFLPIGPGDFLVHHAIALGLHTTTLILVKGALDARGSKLMPDKK
DFGYSFPCDGPGRGGTCDISAWDAFYLAVFWALNTVGWVTFYWHWKNLTV
WQGNVAQFNESSTYLMGWLRDYLWLNSSQLINGYNPFGTNNLSVWSWMFL
FGHLIWATGFMFLISWRGYWQELIETIVWAHQRTPLANIVGWKDKPVALS
IVQARVVGLAHFTVGYFLTYAAFLIASTAGKFG

3D structure

• PDB: 6kig Structural basis for energy and electron transfer of the photosystem I-IsiA-flavodoxin supercomplex.
• Chain: B
• Resolution: 2.9 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	peptide	B	K7 F66 A69 W70 Y136 I140 L143 A147 L150 G153 W154 L157	K6 F65 A68 W69 Y135 I139 L142 A146 L149 G152 W153 L156
BS02	CLA	B	S423 S426 L427 G430 F431 L434 L532 I533 L578 F581 W582	S422 S425 L426 G429 F430 L433 L531 I532 L577 F580 W581
BS03	CLA	B	V442 F446	V441 F445
BS04	CLA	B	S420 S423 W424	S419 S422 W423
BS05	CLA	B	I678 A681 H682 V691	I677 A680 H681 V690
BS06	CLA	B	W648 L651 F652 H654 L655 W657 A658	W647 L650 F651 H653 L654 W656 A657
BS07	CLA	B	T685 P686	T684 P685
BS08	SF4	B	C559 G561 P562 C568 W667	C558 G560 P561 C567 W666
BS09	CLA	B	V438 D441 W582 N585 W589 L616	V437 D440 W581 N584 W588 L615
BS10	CLA	B	Y437 W589 F592 W619 S628 F650 H654 W657 Y717 T720 Y721 F724	Y436 W588 F591 W618 S627 F649 H653 W656 Y716 T719 Y720 F723
BS11	CLA	B	A658 T659 F661 M662 I665 Y670 W671	A657 T658 F660 M661 I664 Y669 W670
BS12	CLA	B	F5 I25 A28 H29 I56	F4 I24 A27 H28 I55
BS13	CLA	B	H29 F31 I46 S49 H50 H53 L330 L334 A337 L341	H28 F30 I45 S48 H49 H52 L329 L333 A336 L340
BS14	CLA	B	H29 H53 I57 W60 L341 I382	H28 H52 I56 W59 L340 I381
BS15	CLA	B	W60 F66 H67 W70 Q71 H89	W59 F65 H66 W69 Q70 H88
BS16	CLA	B	N64 A88 H89 N114 A116 Y117 S118 V645 W646	N63 A87 H88 N113 A115 Y116 S117 V644 W645
BS17	CLA	B	I91 W92 D93 H95 F96 N114 V645	I90 W91 D92 H94 F95 N113 V644
BS18	CLA	B	F47 F51 A152 L155 H156 F161 W167	F46 F50 A151 L154 H155 F160 W166
BS19	CLA	B	W167 S173 H177 T293 N294	W166 S172 H176 T292 N293
BS20	CLA	B	F47 H50 F51 L54 W167 S173 R174 H177 H178 L182 F183	F46 H49 F50 L53 W166 S172 R173 H176 H177 L181 F182
BS21	CLA	B	G128 M129 Q137 F141 A189 W190 H193 H196 V197 G208 W209 F212	G127 M128 Q136 F140 A188 W189 H192 H195 V196 G207 W208 F211
BS22	CLA	B	A189 T191 G192 H196 F212 L216 P217 G221 L222	A188 T190 G191 H195 F211 L215 P216 G220 L221
BS23	CLA	B	W230 S231 L255 F257 H275 L278 A279 V282 T492	W229 S230 L254 F256 H274 L277 A278 V281 T491
BS24	CLA	B	F257 G259 L268 D272 H275 H276 H351 M355 W497	F256 G258 L267 D271 H274 H275 H350 M354 W496
BS25	CLA	B	F183 S186 S187 W190 I273 H276 H277 I280 V344 L347 P357 Y358	F182 S185 S186 W189 I272 H275 H276 I279 V343 L346 P356 Y357
BS26	CLA	B	L175 L179 F284 A287 M290 Y291 I304	L174 L178 F283 A286 M289 Y290 I303
BS27	CLA	B	N176 H177 A180 I285 H289 T293 F295	N175 H176 A179 I284 H288 T292 F294
BS28	CLA	B	I286 H289 M290 G298 H299	I285 H288 M289 G297 H298
BS29	CLA	B	H299 E303 I304 A307 H308	H298 E302 I303 A306 H307
BS30	CLA	B	L305 H308 L315 H319 V407	L304 H307 L314 H318 V406
BS31	CLA	B	A171 R174 L175 H178 F183 I301 Y323 L326 L336 A337 S340 V344	A170 R173 L174 H177 F182 I300 Y322 L325 L335 A336 S339 V343
BS32	CLA	B	V343 S346 Q350 Q376 T380 M383 F387 L527 T531	V342 S345 Q349 Q375 T379 M382 F386 L526 T530
BS33	CLA	B	S340 V343 L347 Q350 H351 S354 M355	S339 V342 L346 Q349 H350 S353 M354
BS34	CLA	B	W60 S118 A370 T373 H374 I378 M649 F718 A722 I726	W59 S117 A369 T372 H373 I377 M648 F717 A721 I725
BS35	CLA	B	W60 V61 G119 W123 S186 V344 T345 V348 M352 Y358 L371 H374 H375	W59 V60 G118 W122 S185 V343 T344 V347 M351 Y357 L370 H373 H374
BS36	CLA	B	A26 H29 D30 L334 F381 G385 H389 I392 R396 Y555 W573 F576	A25 H28 D29 L333 F380 G384 H388 I391 R395 Y554 W572 F575
BS37	CLA	B	G314 V407 R410 H414 I418 H421	G313 V406 R409 H413 I417 H420
BS38	CLA	B	H421 W424	H420 W423
BS39	CLA	B	W424 L427 F428 F431 H432	W423 L426 F427 F430 H431
BS40	CLA	B	V463 A466 S467 L477 L478 W497 F509	V462 A465 S466 L476 L477 W496 F508
BS41	CLA	B	L477 A488 S489 Y493	L476 A487 S488 Y492
BS42	CLA	B	Q350 Y353 A460 V463 Q464 F509 H520 I523 V590 Y593 W594	Q349 Y352 A459 V462 Q463 F508 H519 I522 V589 Y592 W593
BS43	CLA	B	F428 L429 P457 F459 A460 F517 H520 H521	F427 L428 P456 F458 A459 F516 H519 H520
BS44	CLA	B	L422 L527 H528	L421 L526 H527
BS45	CLA	B	T18 W22 V679 H682 W693 K694 P697	T17 W21 V678 H681 W692 K693 P696
BS46	CLA	B	F652 T659 F663 V708 A711 H712	F651 T658 F662 V707 A710 H711
BS47	CLA	B	H308 K309 P310 P311 L315	H307 K308 P309 P310 L314
BS48	CLA	B	G435 V438 H439 V442 K451 I453	G434 V437 H438 V441 K450 I452
BS49	PQN	B	W22 M662 F663 S666 W667 R668 W671 A699 L700 A705	W21 M661 F662 S665 W666 R667 W670 A698 L699 A704

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:0009522 photosystem I
• GO:0009579 thylakoid
• GO:0016020 membrane
• GO:0031676 plasma membrane-derived thylakoid membrane
• GO:0042651 thylakoid membrane

External links

• PDB: RCSB:6kig, PDBe:6kig, PDBj:6kig
• PDBsum: 6kig
• PubMed: 32042157
• UniProt: Q31LJ1|PSAB_SYNE7 Photosystem I P700 chlorophyll a apoprotein A2 (Gene Name=psaB)