ISDA

Deposition Date 2013-03-21

Release Date 2014-03-26

Last Version Date 2024-03-20

Entry Detail

PDB ID:

3W8R

Keywords:

TRANSFERASE

Title:

Mutant structure of Thermus thermophilus HB8 uridine-cytidine kinase

Biological Source:

Source Organism:

Thermus thermophilus (Taxon ID: 300852)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.50 Å

R-Value Free:

0.28

R-Value Work:

0.22

Space Group:

P 21 21 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Uridine kinase
Gene (Uniprot):udk
Mutations:Y93H
Chain IDs:A, B
Chain Length:211
Number of Molecules:2
Biological Source:Thermus thermophilus

UniProt ID:Q5SKR5 Pfam ID:PF00485 EC:2.7.1.48

Ligand Molecules

ACP

CTN

Primary Citation

Indispensable residue for uridine binding in the uridine-cytidine kinase family.

Tomoike, F, Nakagawa, N, Fukui, K, Yano, T, Kuramitsu, S, Masui, R.Show

Biochem Biophys Rep 11 93 98 (2017)

PMID: 28955773 DOI: 10.1016/j.bbrep.2017.07.002

Abstact

Uridine-cytidine kinase (UCK), including human UCK2, are a family of enzymes that generally phosphorylate both uridine and cytidine. However, UCK of Thermus thermophilus HB8 (ttCK) phosphorylates only cytidine. This cytidine-restricted activity is thought to depend on Tyr93, although the precise mechanism remains unresolved. Exhaustive mutagenesis of Tyr93 in ttCK revealed that the uridine phosphorylation activity was restored only by replacement of Tyr93 with His or Gln. Replacement of His117 in human UCK2, corresponding to residue Tyr93 in ttCK, by Tyr resulted in a loss of uridine phosphorylation activity. These findings indicated that uridine phosphorylation activity commonly depends on a single residue in the UCK family.

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Primary Citation of related structures