Structure of PDB 1i2b Chain A

Receptor sequence

>1i2bA (length=392) Species: 3702 (Arabidopsis thaliana)

GSRVMVIGGDGYCGWATALHLSKKNYEVCIVDNLVRRLFDHQLGLESLTP
IASIHDRISRWKALTGKSIELYVGDICDFEFLAESFKSFEPDSVVHFGEQ
RSAPYSMIDRSRAVYTQHNNVIGTLNVLFAIKEFGEECHLVKLGAMGEYG
TPNIDIEEGYITITHNGRTDTLPYPKQASSFYHLSKVHDSHNIAFTCKAW
GIRATDLNQGVVYGVKTDETEMHEELRNRLDYDAVFGTALNRFCVQAAVG
HPLTVYGKGGQTRGYLDIRDTVQCVEIAIANPAKAGEFRVFNQFTEQFSV
NELASLVTKAGSKLGLDVKKMTVPNPRVEAEEHYYNAKHTKLMELGLEPH
YLSDSLLDSLLNFAVQFKDRVDTKQIMPSVSWKKIGVKTKSM

3D structure

• PDB: 1i2b Characterization of the Active Site of UDP-sulfoquinovose Synthase: Formation of the Sulfonic Acid Product in the Crystalline State
• Chain: A
• Resolution: 1.75 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): A145 I154 D155 I156 S180 Y182 H183 K186
• Catalytic site (residue number reindexed from 1): A145 I154 D155 I156 S180 Y182 H183 K186
• Enzyme Commision number: 3.13.1.1: UDP-sulfoquinovose 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	NAD	A	G8 G11 Y12 C13 D32 N33 L34 R36 D75 F97 G98 R101 N119 L143 Y182 K186 Q209 G210 V212	G8 G11 Y12 C13 D32 N33 L34 R36 D75 F97 G98 R101 N119 L143 Y182 K186 Q209 G210 V212
BS02	UPG	A	R101 Y182 Q209 T238 A239 R242 T254 Y256 Q261 V300 R327 E329	R101 Y182 Q209 T238 A239 R242 T254 Y256 Q261 V300 R327 E329
BS03	USQ	A	R101 A145 M146 G147 Y182 T238 A239 R242 T254 Y256 Q261 V300 R327 E329	R101 A145 M146 G147 Y182 T238 A239 R242 T254 Y256 Q261 V300 R327 E329

External links

• PDB: RCSB:1i2b, PDBe:1i2b, PDBj:1i2b
• PDBsum: 1i2b
• UniProt: O48917|SQD1_ARATH UDP-sulfoquinovose synthase, chloroplastic (Gene Name=SQD1)