3OAC

Mint deletion mutant of heterotetrameric geranyl pyrophosphate synthase in complex with ligands


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.203 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 2.1 of the entry. See complete history


Literature

Enhanced specificity of mint geranyl pyrophosphate synthase by modifying the R-loop interactions

Hsieh, F.-L.Chang, T.-H.Ko, T.-P.Wang, A.H.-J.

(2010) J Mol Biol 404: 859-873

  • DOI: https://doi.org/10.1016/j.jmb.2010.10.011
  • Primary Citation of Related Structures:  
    3OAB, 3OAC

  • PubMed Abstract: 

    Isoprenoids, most of them synthesized by prenyltransferases (PTSs), are a class of important biologically active compounds with diverse functions. The mint geranyl pyrophosphate synthase (GPPS) is a heterotetramer composed of two LSU·SSU (large/small subunit) dimers. In addition to C(10)-GPP, the enzyme also produces geranylgeranyl pyrophosphate (C(20)-GGPP) in vitro, probably because of the conserved active-site structures between the LSU of mint GPPS and the homodimeric GGPP synthase from mustard. By contrast, the SSU lacks the conserved aspartate-rich motifs for catalysis. A major active-site cavity loop in the LSU and other trans-type PTSs is replaced by the regulatory R-loop in the SSU. Only C(10)-GPP, but not C(20)-GGPP, was produced when intersubunit interactions of the R-loop were disrupted by either deletion or multiple point mutations. The structure of the deletion mutant, determined in two different crystal forms, shows an intact (LSU·SSU)(2) heterotetramer, as previously observed in the wild-type enzyme. The active-site of LSU remains largely unaltered, except being slightly more open to the bulk solvent. The R-loop of SSU acts by regulating the product release from LSU, just as does its equivalent loop in a homodimeric PTS, which prevents the early reaction intermediates from escaping the active site of the other subunit. In this way, the product-retaining function of R-loop provides a more stringent control for chain-length determination, complementary to the well-established molecular ruler mechanism. We conclude that the R-loop may be used not only to conserve the GPPS activity but also to produce portions of C(20)-GGPP in mint.


  • Organizational Affiliation

    Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Geranyl diphosphate synthase large subunit
A, D
295Mentha x piperitaMutation(s): 0 
EC: 2.5.1.1
UniProt
Find proteins for Q9SBR3 (Mentha piperita)
Explore Q9SBR3 
Go to UniProtKB:  Q9SBR3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9SBR3
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Geranyl diphosphate synthase small subunit
B, C
264Mentha x piperitaMutation(s): 0 
EC: 2.5.1.1
UniProt
Find proteins for Q9SBR4 (Mentha piperita)
Explore Q9SBR4 
Go to UniProtKB:  Q9SBR4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9SBR4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.842α = 90
b = 110.11β = 90
c = 111.5γ = 90
Software Package:
Software NamePurpose
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
DENZOdata reduction
SCALEPACKdata scaling
HKL-2000data scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-03
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-02-26
    Changes: Database references
  • Version 1.3: 2017-11-08
    Changes: Refinement description
  • Version 2.0: 2019-10-16
    Changes: Data collection, Non-polymer description, Structure summary
  • Version 2.1: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary