Structure of PDB 1qk3 Chain B

Receptor sequence
>1qk3B (length=231) Species: 383379 (Toxoplasma gondii RH) [Search protein sequence]
GSHMASKPIEDYGKGKGRIEPMYIPDNTFYNADDFLVPPHCKPYIDKILL
PGGLVKDRVEKLAYDIHRTYFGEELHIICILKGSRGFFNLLIDYLATIQK
YSGRESSVPPFFEHYVRLKSYQNDNSTGQLTVLSDDLSIFRDKHVLIVED
IVDTGFTLTEFGERLKAVGPKSMRIATLVEKRTDRSNSLKGDFVGFSIED
VWIVGCCYDFNEMFRDFDHVAVLSDAARKKF
3D structure
PDB1qk3 Crystal Structures of the Toxoplasma Gondii Hypoxanthine-Guanine Phosphoribosyltransferase Gmp and -Imp Complexes: Comparison of Purine Binding Interactions with the Xmp Complex
ChainB
Resolution1.65 Å
3D
structure
Catalytic site residues are labeled in the structure
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Enzymatic activity
Catalytic site (original residue number in PDB) E146 D147 D150 W199 R212
Catalytic site (residue number reindexed from 1) E149 D150 D153 W202 R215
Enzyme Commision number 2.4.2.22: xanthine phosphoribosyltransferase.
2.4.2.8: hypoxanthine phosphoribosyltransferase.
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 5GP B K79 E146 I148 D150 G152 T154 K178 W199 I200 K82 E149 I151 D153 G155 T157 K181 W202 I203 MOAD: Kd=7.1uM
PDBbind-CN: -logKd/Ki=5.15,Kd=7.1uM
Gene Ontology
Molecular Function
GO:0000166 nucleotide binding
GO:0000287 magnesium ion binding
GO:0000310 xanthine phosphoribosyltransferase activity
GO:0004422 hypoxanthine phosphoribosyltransferase activity
GO:0016757 glycosyltransferase activity
GO:0046872 metal ion binding
GO:0052657 guanine phosphoribosyltransferase activity
Biological Process
GO:0006166 purine ribonucleoside salvage
GO:0006178 guanine salvage
GO:0032263 GMP salvage
GO:0032264 IMP salvage
GO:0032265 XMP salvage
GO:0046100 hypoxanthine metabolic process
Cellular Component
GO:0005737 cytoplasm
GO:0005829 cytosol

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External links
PDB RCSB:1qk3, PDBe:1qk3, PDBj:1qk3
PDBsum1qk3
PubMed10545170
UniProtQ26997|HGXR_TOXGO Hypoxanthine-guanine-xanthine phosphoribosyltransferase (Gene Name=HPRT)

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