Structure of PDB 3ea4 Chain A

Receptor sequence

>3ea4A (length=582) Species: 3702 (Arabidopsis thaliana)

FISRFAPDQPRKGADILVEALERQGVETVFAYPGGASMEIHQALTRSSSI
RNVLPRHEQGGVFAAEGYARSSGKPGICIATSGPGATNLVSGLADALLDS
VPLVAITGQVPRRMIGTDAFQETPIVEVTRSITKHNYLVMDVEDIPRIIE
EAFFLATSGRPGPVLVDVPKDIQQQLAIPNWEQAMRLPGYMSRMPKPPED
SHLEQIVRLISESKKPVLYVGGGCLNSSDELGRFVELTGIPVATTLMGLG
SYPCDDELSLHMLGMHGTVYANYAVEHSDLLLAFGVRFDDRVTGKLEAFA
SRAKIVHIDIDSAEIGKNKTPHVSVCGDVKLALQGMNKVLENRAEELKLD
FGVWRNELNVQKQKFPLSFKTFGEAIPPQYAIKVLDELTDGKAIISTGVG
QHQMWAAQFYNYKKPRQWLSSGGLGAMGFGLPAAIGASVANPDAIVVDID
GDGSFIMNVQELATIRVENLPVKVLLLNNQHLGMVMQWEDRFYKANRAHT
FLGDPAQEDEIFPNMLLFAAACGIPAARVTKKADLREAIQTMLDTPGPYL
LDVICPHQEHVLPMIPSGGTFNDVITEGDGRI

3D structure

• PDB: 3ea4 Crystal structures of two novel sulfonylurea herbicides in complex with Arabidopsis thaliana acetohydroxyacid synthase.
• Chain: A
• Resolution: 2.8 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): Y118 G120 G121 A122 S123 E144 T167 F206 Q207 E208 K256 M351 V378 V485 G511 M513 D538 N565 H567 L568 M570 V571 W574 H643
• Catalytic site (residue number reindexed from 1): Y32 G34 G35 A36 S37 E58 T81 F120 Q121 E122 K170 M265 V292 V399 G425 M427 D452 N479 H481 L482 M484 V485 W488 H557
• Enzyme Commision number: 2.2.1.6: acetolactate synthase.

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	2SM	A	D376 R377 W574 S653	D290 R291 W488 S567	BindingDB: Ki=8530nM
BS02	FAB	A	R246 G307 G308 G309 T331 L332 M333 L349 G350 M351 H352 G371 R373 D375 R377 D395 I396 G413 D414 V415 M490 G508	R160 G221 G222 G223 T245 L246 M247 L263 G264 M265 H266 G285 R287 D289 R291 D309 I310 G327 D328 V329 M404 G422
BS03	TDM	A	V485 G486 Q487 H488 M513 G537 D538 G539 S540 N565 H567 L568 G569 M570 V571	V399 G400 Q401 H402 M427 G451 D452 G453 S454 N479 H481 L482 G483 M484 V485
BS04	MG	A	D538 N565 H567	D452 N479 H481

Gene Ontology

Molecular Function

• GO:0000287 magnesium ion binding
• GO:0003824 catalytic activity
• GO:0003984 acetolactate synthase activity
• GO:0030976 thiamine pyrophosphate binding
• GO:0050660 flavin adenine dinucleotide binding

Biological Process

• GO:0009082 branched-chain amino acid biosynthetic process

External links

• PDB: RCSB:3ea4, PDBe:3ea4, PDBj:3ea4
• PDBsum: 3ea4
• PubMed: 19187232
• UniProt: P17597|ILVB_ARATH Acetolactate synthase, chloroplastic (Gene Name=ALS)