2R3V

The Biochemical and Structural Basis for Feedback Inhibition of Mevalonate Kinase and Isoprenoid Metabolism


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Biochemical and Structural Basis for Feedback Inhibition of Mevalonate Kinase and Isoprenoid Metabolism.

Fu, Z.Voynova, N.E.Herdendorf, T.J.Miziorko, H.M.Kim, J.J.

(2008) Biochemistry 47: 3715-3724

  • DOI: 10.1021/bi7024386
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mevalonate kinase (MK), which catalyzes a key reaction in polyisoprenoid and sterol metabolism in many organisms, is subject to feedback regulation by farnesyl diphosphate and related compounds. The structures of human mevalonate kinase and a binary ...

    Mevalonate kinase (MK), which catalyzes a key reaction in polyisoprenoid and sterol metabolism in many organisms, is subject to feedback regulation by farnesyl diphosphate and related compounds. The structures of human mevalonate kinase and a binary complex of the rat enzyme incubated with farnesyl thiodiphosphate (FSPP) are reported. Significant FSPP hydrolysis occurs under crystallization conditions; this results in detection of farnesyl thiophosphate (FSP) in the structure of the binary complex. Farnesyl thiodiphosphate competes with substrate ATP to produce feedback inhibition of mevalonate kinase. The binding sites for these metabolites overlap, with the phosphate of FSP nearly superimposed on ATP's beta-phosphate and FSP's polyisoprenoid chain overlapping ATP's adenosine moiety. Several hydrophobic amino acid side chains are positioned near the polyisoprenoid chain of FSP and their functional significance has been evaluated in mutagenesis experiments with human MK, which exhibits the highest reported sensitivity to feedback inhibition. Results suggest that single and double mutations at T104 and I196 produce a significant inflation of the K(i) for FSPP (approximately 40-fold for T104A/I196A). Such an effect persists when K(i) values are normalized for effects on the K(m) for ATP, suggesting that it may be possible to engineer MK proteins with altered sensitivity to feedback inhibition. Comparison of animal MK protein alignments and structures with those of a MK protein from Streptococcus pneumoniae indicates that sequence differences between N- and C-terminal domains correlate with differences in interdomain angles. Bacterial MK proteins exhibit more solvent exposure of feedback inhibitor binding sites and, consequently, weaker binding of these inhibitors.


    Organizational Affiliation

    Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mevalonate kinase
A, B, C, D
396Homo sapiensMutation(s): 0 
Gene Names: MVK
EC: 2.7.1.36
Find proteins for Q03426 (Homo sapiens)
Go to Gene View: MVK
Go to UniProtKB:  Q03426
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.239 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 102.030α = 90.00
b = 78.200β = 113.33
c = 109.450γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
MERLOTphasing
SCALEPACKdata scaling
CrystalCleardata collection
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-06-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance