Structure of PDB 6tcl Chain B2

Receptor sequence

>6tclB2 (length=739) Species: 103690 (Nostoc sp. PCC 7120 = FACHB-418)

TKFPKFSQDLAQDPTTRRIWYAMAMGNDFESHDGMTEENLYQKIFATHFG
HLAIIFLWASSLLFHVAWQGNFEQWIKDPLHVRPIAHAIWDPHFGKPAIE
AFTQAGANGPVNIAYSGVYHWWYTIGMRTNTELYTGSVFLLLFASLFLFA
GWLHLQPKFRPSLAWFKSAESRLNHHLAGLFGVSSLAWAGHLIHVAIPES
RGQHVGWDNFLSTAPHPAGLQPFFTGNWGVYAQNPDTAGHIFSTSQGAGT
AILTFLGGFHPQTESLWLTDMAHHHLAIAVLFIVAGHMYRTNFGIGHSIK
EMMNAKTFFGKPVEGPFNMPHQGIYDTYNNSLHFQLGWHLACLGVVTSWV
AQHMYSLPSYAFIAKDYTTQAALYTHHQYIAIFLMVGAFAHGAIFLVRDY
DPEQNKGNVLERVLQHKEAIISHLSWVSLFLGFHTLGLYVHNDVVVAFGT
PEKQILIEPVFAQFIQAAHGKVLYGLDTLLSNPDSVAYTAYPNYANVWLP
GWLDAINSGTNSLFLTIGPGDFLVHHAIALGLHTTTLILVKGALDARGSK
LMPDKKDFGYAFPCDGPGRGGTCDISAWDSFYLSLFWALNTVGWVTFYWH
WKHLGIWQGNVAQFNENSTYLMGWFRDYLWANSAQLINGYNPYGVNNLSV
WAWMFLFGHLVWATGFMFLISWRGYWQELIETLVWAHERTPIANLVRWKD
KPVALSIVQARVVGLAHFTVGYVLTYAAFLIASTAGKFG

3D structure

• PDB: 6tcl Distinct structural modulation of photosystem I and lipid environment stabilizes its tetrameric assembly.
• Chain: B2
• Resolution: 3.2 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	B2	A665 F668 M669 Y677 W678	A663 F666 M667 Y675 W676
BS02	CL0	B2	L631 W632	L629 W630
BS03	CLA	B2	S430 L431 G434 F435 L438 L532 L539 I540 L585 F588 W589	S428 L429 G432 F433 L436 L530 L537 I538 L583 F586 W587
BS04	CLA	B2	V442 D445 W589 N592 W596 L623 F627 W664 F720	V440 D443 W587 N590 W594 L621 F625 W662 F718
BS05	CLA	B2	F8 M25 N29 F31 K45	F6 M23 N27 F29 K43
BS06	CLA	B2	N29 F31 I46 T49 H50 H53 L334 H341	N27 F29 I44 T47 H48 H51 L332 H339
BS07	CLA	B2	H53 W60 I382	H51 W58 I380
BS08	CLA	B2	S63 F66 H67 W70 Q71	S61 F64 H65 W68 Q69
BS09	CLA	B2	A88 H89 A116 Y117 S118 V652 W653	A86 H87 A114 Y115 S116 V650 W651
BS10	CLA	B2	I91 W92 D93 H95 F96 N114	I89 W90 D91 H93 F94 N112
BS11	CLA	B2	P94 H95	P92 H93
BS12	CLA	B2	A152 H156 F161 W167	A150 H154 F159 W165
BS13	CLA	B2	W167 H177 N294	W165 H175 N292
BS14	CLA	B2	F47 H50 F51 L54 W123 W167 R174 H177 H178 L182 F183	F45 H48 F49 L52 W121 W165 R172 H175 H176 L180 F181
BS15	CLA	B2	G128 T137 F141 A189 W190 H193 V197 G208 W209 F212	G126 T135 F139 A187 W188 H191 V195 G206 W207 F210
BS16	CLA	B2	L188 A189 I195 H196 A216 P217	L186 A187 I193 H194 A214 P215
BS17	CLA	B2	F257 H275 L278 A279 V282	F255 H273 L276 A277 V280
BS18	CLA	B2	F257 G259 L268 H275 H276 A279 I280 H355 L359 W504	F255 G257 L266 H273 H274 A277 I278 H353 L357 W502
BS19	CLA	B2	W123 S186 S187 W190 H276 H277 W351 V352 S361 Y362	W121 S184 S185 W188 H274 H275 W349 V350 S359 Y360
BS20	CLA	B2	L179 F284 A287 M290 Y291	L177 F282 A285 M288 Y289
BS21	CLA	B2	N176 H177 H289 T293 F295	N174 H175 H287 T291 F293
BS22	CLA	B2	V286 M290 I297 G298 H299	V284 M288 I295 G296 H297
BS23	CLA	B2	H299 M304 A307 T309 F319	H297 M302 A305 T307 F317
BS24	CLA	B2	M305 P318 F319 H323 V411	M303 P316 F317 H321 V409
BS25	CLA	B2	A171 R174 H178 I301 Y327 Y330 W340 H341	A169 R172 H176 I299 Y325 Y328 W338 H339
BS26	CLA	B2	V347 S350 W351 Q354 Q380 I384 M387 L534 T538	V345 S348 W349 Q352 Q378 I382 M385 L532 T536
BS27	CLA	B2	C344 V347 W351 Q354 H355 S358 F516	C342 V345 W349 Q352 H353 S356 F514
BS28	CLA	B2	W60 S118 H378 Y381 I382	W58 S116 H376 Y379 I380
BS29	CLA	B2	W60 W123 V352 M356 Y362 H378 H379	W58 W121 V350 M354 Y360 H376 H377
BS30	CLA	B2	A26 N29 L338 L342 F385 G389 H393 I396 Y562 W580 F583	A24 N27 L336 L340 F383 G387 H391 I394 Y560 W578 F581
BS31	CLA	B2	M321 R414 H418 H425	M319 R412 H416 H423
BS32	CLA	B2	H425 W428	H423 W426
BS33	CLA	B2	W428 F432 F435 H436	W426 F430 F433 H434
BS34	CLA	B2	G439 H443 V447 K455	G437 H441 V445 K453
BS35	CLA	B2	F466 I467 H471 L482 W504	F464 I465 H469 L480 W502
BS36	CLA	B2	A492 A497 W500	A490 A495 W498
BS37	CLA	B2	Q354 Y376 Q468 L517 I519 H527 Y600	Q352 Y374 Q466 L515 I517 H525 Y598
BS38	CLA	B2	F432 L433 F463 F524 H528	F430 L431 F461 F522 H526
BS39	CLA	B2	L426 V429 H535	L424 V427 H533
BS40	CLA	B2	T18 W22 H689 R699 W700 K701 P704	T16 W20 H687 R697 W698 K699 P702
BS41	CLA	B2	W22 F659 L662 T666 V715 H719	W20 F657 L660 T664 V713 H717
BS42	PQN	B2	W22 M25 M669 F670 S673 W674 R675 W678 A706 L707 A712	W20 M23 M667 F668 S671 W672 R673 W676 A704 L705 A710
BS43	ECH	B2	L65 W123 G138 F141 L142 W209	L63 W121 G136 F139 L140 W207
BS44	CLA	B2	N592 F599 W626 F627 S635 F657 H661 W664 Y724 T727 Y728 F731	N590 F597 W624 F625 S633 F655 H659 W662 Y722 T725 Y726 F729
BS45	CLA	B2	W655 L658 F659 H661 L662 W664 A665	W653 L656 F657 H659 L660 W662 A663
BS46	CLA	B2	S424 S427 L431	S422 S425 L429
BS47	CLA	B2	L685 H689	L683 H687
BS48	SF4	B2	C566 G573 T574 C575 W674	C564 G571 T572 C573 W672

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:6tcl, PDBe:6tcl, PDBj:6tcl
• PDBsum: 6tcl
• PubMed: 32170279
• UniProt: P58565|PSAB1_NOSS1 Photosystem I P700 chlorophyll a apoprotein A2 1 (Gene Name=psaB1)