PDBsum entry 1g4c

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protein metals Protein-protein interface(s) links
Transferase PDB id
Protein chains
158 a.a. *
_CL ×3
_MG ×3
Waters ×425
* Residue conservation analysis
PDB id:
Name: Transferase
Title: Crystal structure of a complex of hppk(r92a) from e.Coli with mg2+ at 1.65 angstrom resolution
Structure: 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase. Chain: a, b. Synonym: 2-amino-4-hydroxy-6-hydroxymethyldihydropteridine pyrophosphokinase, hppk. Engineered: yes. Mutation: yes
Source: Escherichia coli. Organism_taxid: 562. Expressed in: escherichia coli. Expression_system_taxid: 562.
1.65Å     R-factor:   0.205     R-free:   0.236
Authors: J.Blaszczyk,X.Ji
Key ref:
J.Blaszczyk et al. (2003). Dynamic roles of arginine residues 82 and 92 of Escherichia coli 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase: crystallographic studies. Biochemistry, 42, 1573-1580. PubMed id: 12578370 DOI: 10.1021/bi0267994
26-Oct-00     Release date:   15-Apr-03    
Go to PROCHECK summary

Protein chains
Pfam   ArchSchema ?
P26281  (HPPK_ECOLI) -  2-amino-4-hydroxy-6-hydroxymethyldihydropteridine pyrophosphokinase
159 a.a.
158 a.a.*
Key:    PfamA domain  Secondary structure  CATH domain
* PDB and UniProt seqs differ at 1 residue position (black cross)

 Enzyme reactions 
   Enzyme class: E.C.  - 2-amino-4-hydroxy-6-hydroxymethyldihydropteridine diphosphokinase.
[IntEnz]   [ExPASy]   [KEGG]   [BRENDA]

Folate Biosynthesis (late stages)
      Reaction: ATP + 2-amino-4-hydroxy-6-hydroxymethyl-7,8-dihydropteridine = AMP + (2-amino-4-hydroxy-7,8-dihydropteridin-6-yl)methyl diphosphate
+ 2-amino-4-hydroxy-6-hydroxymethyl-7,8-dihydropteridine
+ (2-amino-4-hydroxy-7,8-dihydropteridin-6-yl)methyl diphosphate
Molecule diagrams generated from .mol files obtained from the KEGG ftp site
 Gene Ontology (GO) functional annotation 
  GO annot!
  Biological process     phosphorylation   4 terms 
  Biochemical function     nucleotide binding     6 terms  


DOI no: 10.1021/bi0267994 Biochemistry 42:1573-1580 (2003)
PubMed id: 12578370  
Dynamic roles of arginine residues 82 and 92 of Escherichia coli 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase: crystallographic studies.
J.Blaszczyk, Y.Li, G.Shi, H.Yan, X.Ji.
6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) catalyzes the pyrophosphoryl transfer from ATP to 6-hydroxymethyl-7,8-dihydropterin (HP), the first reaction in the folate biosynthetic pathway. Arginine residues 82 and 92, strictly conserved in 35 HPPK sequences, play dynamic roles in the catalytic cycle of the enzyme. At 0.89-A resolution, two distinct conformations are observed for each of the two residues in the crystal structure of the wild-type HPPK in complex with two HP variants, two Mg(2+) ions, and an ATP analogue. Structural information suggests that R92 first binds to the alpha-phosphate group of ATP and then shifts to interact with the beta-phosphate as R82, which initially does not bind to ATP, moves in and binds to alpha-phosphate when the pyrophosphoryl transfer is about to occur. The dynamic roles of R82 and R92 are further elucidated by five more crystal structures of two mutant proteins, R82A and R92A, with and without bound ligands. Two oxidized forms of HP are observed with an occupancy ratio of 0.50:0.50 in the 0.89-A structure. The oxidation of HP has significant impact on its binding to the protein as well as the conformation of nearby residue W89.

Literature references that cite this PDB file's key reference

  PubMed id Reference
21152407 C.W.Pemble, P.K.Mehta, S.Mehra, Z.Li, A.Nourse, R.E.Lee, and S.W.White (2010).
Crystal structure of the 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase•dihydropteroate synthase bifunctional enzyme from Francisella tularensis.
  PLoS One, 5, e14165.
PDB codes: 3mcm 3mcn 3mco
18323618 E.Nishibori, T.Nakamura, M.Arimoto, S.Aoyagi, H.Ago, M.Miyano, T.Ebisuzaki, and M.Sakata (2008).
Application of maximum-entropy maps in the accurate refinement of a putative acylphosphatase using 1.3 A X-ray diffraction data.
  Acta Crystallogr D Biol Crystallogr, 64, 237-247.  
17680687 M.Brylinski, and J.Skolnick (2008).
What is the relationship between the global structures of apo and holo proteins?
  Proteins, 70, 363-377.  
18007032 J.Blaszczyk, Y.Li, S.Cherry, J.Alexandratos, Y.Wu, G.Shaw, J.E.Tropea, D.S.Waugh, H.Yan, and X.Ji (2007).
Structure and activity of Yersinia pestis 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase as a novel target for the development of antiplague therapeutics.
  Acta Crystallogr D Biol Crystallogr, 63, 1169-1177.
PDB code: 2qx0
15821168 R.Yang, M.C.Lee, H.Yan, and Y.Duan (2005).
Loop conformation and dynamics of the Escherichia coli HPPK apo-enzyme and its binary complex with MgATP.
  Biophys J, 89, 95.  
The most recent references are shown first. Citation data come partly from CiteXplore and partly from an automated harvesting procedure. Note that this is likely to be only a partial list as not all journals are covered by either method. However, we are continually building up the citation data so more and more references will be included with time. Where a reference describes a PDB structure, the PDB codes are shown on the right.