PMID- 12756244
OWN - NLM
STAT- MEDLINE
DCOM- 20030910
LR  - 20151119
IS  - 0021-9258 (Print)
IS  - 0021-9258 (Linking)
VI  - 278
IP  - 31
DP  - 2003 Aug 1
TI  - Catalytic mechanism revealed by the crystal structure of undecaprenyl
      pyrophosphate synthase in complex with sulfate, magnesium, and triton.
PG  - 29298-307
AB  - Undecaprenyl pyrophosphate synthase (UPPs) catalyzes chain elongation of farnesyl
      pyrophosphate (FPP) to undecaprenyl pyrophosphate (UPP) via condensation with
      eight isopentenyl pyrophosphates (IPP). UPPs from Escherichia coli is a dimer,
      and each subunit consists of 253 amino acid residues. The chain length of the
      product is modulated by a hydrophobic active site tunnel. In this paper, the
      crystal structure of E. coli UPPs was refined to 1.73 A resolution, which showed 
      bound sulfate and magnesium ions as well as Triton X-100 molecules. The amino
      acid residues 72-82, which encompass an essential catalytic loop not seen in the 
      previous apoenzyme structure (Ko, T.-P., Chen, Y. K., Robinson, H., Tsai, P. C., 
      Gao, Y.-G., Chen, A. P.-C., Wang, A. H.-J., and Liang, P.-H. (2001) J. Biol.
      Chem. 276, 47474-47482), also became visible in one subunit. The sulfate ions
      suggest locations of the pyrophosphate groups of FPP and IPP in the active site. 
      The Mg2+ is chelated by His-199 and Glu-213 from different subunits and possibly 
      plays a structural rather than catalytic role. However, the metal ion is near the
      IPP-binding site, and double mutation of His-199 and Glu-213 to alanines showed a
      remarkable increase of Km value for IPP. Inside the tunnel, one Triton surrounds 
      the top portion of the tunnel, and the other occupies the bottom part. These two 
      Triton molecules may mimic the hydrocarbon moiety of the UPP product in the
      active site. Kinetic analysis indicated that a high concentration (>1%) of Triton
      inhibits the enzyme activity.
FAU - Chang, Sing-Yang
AU  - Chang SY
AD  - Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan.
FAU - Ko, Tzu-Ping
AU  - Ko TP
FAU - Liang, Po-Huang
AU  - Liang PH
FAU - Wang, Andrew H-J
AU  - Wang AH
LA  - eng
SI  - PDB/1UEH
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20030519
PL  - United States
TA  - J Biol Chem
JT  - The Journal of biological chemistry
JID - 2985121R
RN  - 0 (Sulfates)
RN  - 30IQX730WE (Polyethylene Glycols)
RN  - EC 2.5.- (Alkyl and Aryl Transferases)
RN  - EC 2.5.1.31 (undecaprenyl pyrophosphate synthetase)
RN  - I38ZP9992A (Magnesium)
SB  - IM
MH  - Alkyl and Aryl Transferases/*chemistry/genetics/*metabolism
MH  - Binding Sites
MH  - Catalysis
MH  - Crystallization
MH  - Crystallography, X-Ray
MH  - Dimerization
MH  - Escherichia coli/enzymology
MH  - Magnesium/*metabolism
MH  - Models, Molecular
MH  - Molecular Structure
MH  - Mutagenesis, Site-Directed
MH  - Polyethylene Glycols/*metabolism
MH  - Protein Conformation
MH  - Structure-Activity Relationship
MH  - Sulfates/*metabolism
EDAT- 2003/05/21 05:00
MHDA- 2003/09/11 05:00
CRDT- 2003/05/21 05:00
PHST- 2003/05/21 05:00 [pubmed]
PHST- 2003/09/11 05:00 [medline]
PHST- 2003/05/21 05:00 [entrez]
AID - 10.1074/jbc.M302687200 [doi]
AID - M302687200 [pii]
PST - ppublish
SO  - J Biol Chem. 2003 Aug 1;278(31):29298-307. doi: 10.1074/jbc.M302687200. Epub 2003
      May 19.