Structure of PDB 4xk8 Chain B

Receptor sequence

>4xk8B (length=733) Species: 3888 (Pisum sativum)

ALRFPRFSQGIAQDPTTRRIWFGIATAHDFESHDDITEGRLYQNIFASHF
GQLAIIFLWTSGNLFHVAWQGNFEAWVQDPFHVRPIAHAIWDPHFGQPAV
EAFTRGGALGPVNNAYSGVYQWWYTIGLRTNEDLYTGAIFLLFLSFISLL
AGWLHLQPKWKPSVSWFKNAESRLNHHLSGLFGVSSLAWAGHLVHVAIPG
SRGEYVRWNNFLDVLPHPQGLGPLLTGQWNLYAQNPSSSNHLFGTTQGAG
TAILTILGGFHPQTQSLWLTDMAHHHLAIAFLFLIGGHMYRTNFGIGHSI
KYILEAHIPPGGRLGRGHKGLYDTINNSIHFQLGLALASLGVITSLVAQH
MYSLPAYAFIAQDFTTQAALYTHHQYIAGFIMTGAFAHGPIFFIRDYNPE
QNADNVLARMLEHKEAIISHLSWASLFLGFHTLGLYVHNDVMLAFGTPEK
QILIEPIFAQWIQSAHGKTTYGFDVLLSSTNGPALNAGRNIWLPGWLNAI
NENSNSLFLTIGPGDFLVHHAIALGLHTTTLILVKGALDARGSKLMPDKK
DFGYSFPCDGPGRGGTCDISAWDAFYLAVFWMLNTIGWVTFYWHWKHITL
WRGNVSQFNESSTYLMGWLRDYLWLNSSQLINGYNPFGMNSLSVWAWMFL
FGHLVWATGFMFLISWRGYWQELIETLAWAHERTPLANLIRWRDKPVALS
IVQARLVGLVHFSVGYIFTYAAFLIASTSGKFG

3D structure

• PDB: 4xk8 Structural basis for energy transfer pathways in the plant PSI-LHCI supercomplex
• Chain: B
• Resolution: 2.8 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	R20 I21 W92 R694 D695	R19 I20 W91 R693 D694
BS02	CLA	B	L620 L624 W625	L619 L623 W624
BS03	CLA	B	S426 L427 G430 F431 L532 I533 L578 F581 W582	S425 L426 G429 F430 L531 I532 L577 F580 W581
BS04	CLA	B	W648 L651 H654 L655 W657 A658	W647 L650 H653 L654 W656 A657
BS05	CLA	B	R684 T685 P686	R683 T684 P685
BS06	CLA	B	S420 S423 W424 L427	S419 S422 W423 L426
BS07	CLA	B	L678 A681 H682 I691	L677 A680 H681 I690
BS08	SF4	B	C559 C568 W667	C558 C567 W666
BS09	CLA	B	W582 N585 W589 L616 W657	W581 N584 W588 L615 W656
BS10	CLA	B	W589 F592 L616 L624 F650 H654 W657 Y717 T720 Y721 F724	W588 F591 L615 L623 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 F8 A28 H29 F31 I56	F4 F7 A27 H28 F30 I55
BS13	CLA	B	H29 F31 Y43 I46 S49 H50 Q53 L54 R174 I330 H331 Q333 L334	H28 F30 Y42 I45 S48 H49 Q52 L53 R173 I329 H330 Q332 L333
BS14	CLA	B	H29 Q53 I57 W60 F381	H28 Q52 I56 W59 F380
BS15	CLA	B	L59 W60 F66 H67 W70 Q71 A90	L58 W59 F65 H66 W69 Q70 A89
BS16	CLA	B	W60 N64 A88 H89 N114 Y117 S118 W646	W59 N63 A87 H88 N113 Y116 S117 W645
BS17	CLA	B	I91 W92 D93 H95 F96 N114 V645 W648	I90 W91 D92 H94 F95 N113 V644 W647
BS18	CLA	B	F47 F51 I148 A152 L155 H156 W161 W167	F46 F50 I147 A151 L154 H155 W160 W166
BS19	CLA	B	F47 H50 F51 W123 W167 F168 S173 R174 H177 H178 L182 F183	F46 H49 F50 W122 W166 F167 S172 R173 H176 H177 L181 F182
BS20	CLA	B	D134 F141 A189 W190 H193 H196 V197 R208 W209 F212	D133 F140 A188 W189 H192 H195 V196 R207 W208 F211
BS21	CLA	B	L188 A189 G192 V195 H196 F212 P217 G221 L222	L187 A188 G191 V194 H195 F211 P216 G220 L221
BS22	CLA	B	W230 L255 I257 H275 L278 A279 F282 I492	W229 L254 I256 H274 L277 A278 F281 I491
BS23	CLA	B	I257 L268 D272 H275 H276 A279 I280 H351 W497	I256 L267 D271 H274 H275 A278 I279 H350 W496
BS24	CLA	B	W123 I127 S186 S187 W190 M273 H276 H277 I280 Y358	W122 I126 S185 S186 W189 M272 H275 H276 I279 Y357
BS25	CLA	B	L179 F284 M290 Y291	L178 F283 M289 Y290
BS26	CLA	B	H177 S180 H289 T293 F295 I297	H176 S179 H288 T292 F294 I296
BS27	CLA	B	I286 H289 M290 I297 G298 H299	I285 H288 M289 I296 G297 H298
BS28	CLA	B	H299 A307 H308	H298 A306 H307
BS29	CLA	B	L305 H319 V407	L304 H318 V406
BS30	CLA	B	A171 R174 L175 H178 I301 Y323 L336 A337 S340	A170 R173 L174 H177 I300 Y322 L335 A336 S339
BS31	CLA	B	S346 L347 Q350 Q376 M383 F387 L527 T531	S345 L346 Q349 Q375 M382 F386 L526 T530
BS32	CLA	B	V343 L347 Q350 H351 S354 L355 F509	V342 L346 Q349 H350 S353 L354 F508
BS33	CLA	B	W60 S118 A370 H374 Y377 I378 I718 A722	W59 S117 A369 H373 Y376 I377 I717 A721
BS34	CLA	B	W60 T61 W123 T345 V348 M352 Y358 H374 H375	W59 T60 W122 T344 V347 M351 Y357 H373 H374
BS35	CLA	B	A26 H29 D30 L334 L338 F381 G385 H389 I392 R396 Y555 W573 F576 V711	A25 H28 D29 L333 L337 F380 G384 H388 I391 R395 Y554 W572 F575 V710
BS36	CLA	B	R314 L315 V407 R410 M411 E413 H414 H421	R313 L314 V406 R409 M410 E412 H413 H420
BS37	CLA	B	H421 W424	H420 W423
BS38	CLA	B	F428 F431 H432	F427 F430 H431
BS39	CLA	B	G435 V438 H439 V442 M443 K451	G434 V437 H438 V441 M442 K450
BS40	CLA	B	I463 H467 L478 W497	I462 H466 L477 W496
BS41	CLA	B	A485 A488 W493	A484 A487 W492
BS42	CLA	B	Q350 A460 I463 Q464 F509 L510 H520 I523 V590 Y593 W594	Q349 A459 I462 Q463 F508 L509 H519 I522 V589 Y592 W593
BS43	CLA	B	L429 P457 F459 A460 D516 F517 H520 H521	L428 P456 F458 A459 D515 F516 H519 H520
BS44	CLA	B	I418 L422 H528	I417 L421 H527
BS45	CLA	B	T18 W22 H682 W693 R694 P697	T17 W21 H681 W692 R693 P696
BS46	CLA	B	W22 F652 F663 V711 H712	W21 F651 F662 V710 H711
BS47	CLA	B	H308 I309 P310 L315	H307 I308 P309 L314
BS48	PQN	B	F663 S666 W667 R668 W671 A699 L700 A705	F662 S665 W666 R667 W670 A698 L699 A704
BS49	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:4xk8, PDBe:4xk8, PDBj:4xk8
• PDBsum: 4xk8
• PubMed: 26023133
• UniProt: P05311|PSAB_PEA Photosystem I P700 chlorophyll a apoprotein A2 (Gene Name=psaB)