1UMP

GEOMETRY OF TRITERPENE CONVERSION TO PENTACARBOCYCLIC HOPENE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.13 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

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This is version 1.2 of the entry. See complete history


Literature

Conversion of Squalene to the Pentacarbocyclic Hopene

Reinert, D.J.Balliano, G.Schulz, G.E.

(2004) Chem Biol 11: 121

  • DOI: 10.1016/j.chembiol.2003.12.013
  • Primary Citation of Related Structures:  
    1UMP

  • PubMed Abstract: 
  • The membrane protein squalene-hopene cyclase was cocrystallized with 2-azasqualene and analyzed by X-ray diffraction to 2.13 A resolution. The conformation of this close analog was clearly established, and it agreed with the common textbook presentation. The bound squalene undergoes only small conformational changes during the formation of rings A through D, thus requiring no intermediate ...

    The membrane protein squalene-hopene cyclase was cocrystallized with 2-azasqualene and analyzed by X-ray diffraction to 2.13 A resolution. The conformation of this close analog was clearly established, and it agreed with the common textbook presentation. The bound squalene undergoes only small conformational changes during the formation of rings A through D, thus requiring no intermediate. However, ring E formation is hindered by an entropic barrier, which may explain its absence in the steroids. The structure analysis revealed a mobile region between the active center cavity and the membrane, which may melt, opening a passage for squalene and hopene.


    Related Citations: 
    • Crystal Structure of a Squalene Cyclase in Complex with the Potential Anticholesteremic Drug Ro48-8071
      Lenhart, A., Weihofen, W., Pleschke, A., Schulz, G.
      (2002) Chem Biol 9: 639
    • The Structure of the Membrane Protein Squalene-Hopene Cyclase at 2.0 A Resolution
      Wendt, K.U., Lenhart, A., Schulz, G.E.
      (1999) J Mol Biol 286: 175
    • Structure and Function of a Squalene Cyclase
      Wendt, K.U., Poralla, K., Schulz, G.E.
      (1997) Science 277: 1811
    • Crystallization and Preliminary X-Ray Crystallographic Analysis of Squalene-Hopene Cyclase from Alicyclobacillus Acidocaldarius
      Wendt, K.U., Feil, C., Lenhart, A., Poralla, K., Schulz, G.E.
      (1997) Protein Sci 6: 722

    Organizational Affiliation

    Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, Albertstr. 21, D-79104 Freiburg, Germany.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SQUALENE--HOPENE CYCLASEA, B, C631Alicyclobacillus acidocaldariusMutation(s): 0 
EC: 5.4.99.17 (PDB Primary Data), 4.2.1.129 (UniProt)
UniProt
Find proteins for P33247 (Alicyclobacillus acidocaldarius subsp. acidocaldarius (strain ATCC 27009 / DSM 446 / BCRC 14685 / JCM 5260 / KCTC 1825 / NBRC 15652 / NCIMB 11725 / NRRL B-14509 / 104-IA))
Explore P33247 
Go to UniProtKB:  P33247
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.13 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.144α = 90
b = 139.144β = 90
c = 240.699γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-03
    Type: Initial release
  • Version 1.1: 2013-11-20
    Changes: Derived calculations, Non-polymer description, Other, Source and taxonomy, Version format compliance
  • Version 1.2: 2019-05-08
    Changes: Data collection, Experimental preparation, Other