4V40

BETA-GALACTOSIDASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Three-dimensional structure of beta-galactosidase from E. coli.

Jacobson, R.H.Zhang, X.J.DuBose, R.F.Matthews, B.W.

(1994) Nature 369: 761-766

  • DOI: 10.1038/369761a0
  • Primary Citation of Related Structures:  1BGL, 1BGM

  • PubMed Abstract: 
  • The beta-galactosidase from Escherichia coli was instrumental in the development of the operon model, and today is one of the most commonly used enzymes in molecular biology. Here we report the structure of this protein and show that it is a tetramer ...

    The beta-galactosidase from Escherichia coli was instrumental in the development of the operon model, and today is one of the most commonly used enzymes in molecular biology. Here we report the structure of this protein and show that it is a tetramer with 222-point symmetry. The 1,023-amino-acid polypeptide chain folds into five sequential domains, with an extended segment at the amino terminus. The participation of this amino-terminal segment in a subunit interface, coupled with the observation that each active site is made up of elements from two different subunits, provides a structural rationale for the phenomenon of alpha-complementation. The structure represents the longest polypeptide chain for which an atomic structure has been determined. Our results show that it is possible successfully to study non-viral protein crystals with unit cell dimensions in excess of 500 A and with relative molecular masses in the region of 2,000K per asymmetric unit. Non-crystallographic symmetry averaging proved to be a very powerful tool in the structure determination, as has been shown in other contexts.


    Related Citations: 
    • Crystallization of Beta-Galactosidase from Escherichia Coli
      Jacobson, R.H.,Matthews, B.W.
      (1992) J.Mol.Biol. 223: 1177


    Organizational Affiliation

    Institute of Molecular Biology, Howard Hughes Medical Institute, University of Oregon, Eugene 97403.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BETA-GALACTOSIDASE
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
1023Escherichia coli (strain K12)Gene Names: lacZ
EC: 3.2.1.23
Find proteins for P00722 (Escherichia coli (strain K12))
Go to UniProtKB:  P00722
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 107.900α = 90.00
b = 207.500β = 94.70
c = 509.900γ = 90.00
Software Package:
Software NamePurpose
TNTrefinement
TNTrefinement
WEISdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-07-09
    Type: Initial release
  • Version 1.1: 2014-12-10
    Type: Other