1RBA

SUBSTITUTION OF ASP193 TO ASN AT THE ACTIVE SITE OF RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE RESULTS IN CONFORMATIONAL CHANGES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Observed: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Substitution of ASP193 to ASN at the active site of ribulose-1,5-bisphosphate carboxylase results in conformational changes.

Soderlind, E.Schneider, G.Gutteridge, S.

(1992) Eur J Biochem 206: 729-735

  • DOI: 10.1111/j.1432-1033.1992.tb16979.x
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The crystal structure of a mutant of ribulose bisphosphate carboxylase/oxygenase from Rhodospirillium rubrum, where Asp193, one of the ligands of the magnesium ion at the activator site, is replaced by Asn, has been determined to a nominal resolution ...

    The crystal structure of a mutant of ribulose bisphosphate carboxylase/oxygenase from Rhodospirillium rubrum, where Asp193, one of the ligands of the magnesium ion at the activator site, is replaced by Asn, has been determined to a nominal resolution of 0.26 nm. The mutation of Asp to Asn induces both local and global conformation changes as follows. The side chain of Asn193 moves away from the active site and interacts with main-chain oxygen of residue 165, located in the neighbouring strand beta 1 of the alpha/beta barrel. The side chain of Lys166, which forms a salt bridge with Asp193 in the wild-type enzyme, interacts with Asn54 from the second subunit and creates a new subunit-subunit interaction. Another new subunit-subunit interaction is formed, more than 1.2 nm away from the site of the mutation. In the mutant enzyme, the side chain of Asp263 interacts with the side chain of Thr106 from the second subunit. Asp193 is not part of a subunit-subunit interface area or an allosteric regulatory site. Nevertheless, replacement of this residue by Asn results, unexpectedly, in a difference in the packing of the two subunits, which can be described as a slight rotation of one of the subunits relative to the second. The observed structural changes at the active site of the enzyme provide a molecular explanation for the differing behaviour of the Asp193----Asn mutant with respect to activation.


    Organizational Affiliation

    Department of Molecular Biology, Swedish University of Agricultural Sciences, Uppsala Biomedical Center, Sweden.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RUBISCOA, B466Rhodospirillum rubrumMutation(s): 1 
Gene Names: cbbMcbbL2rbpL
EC: 4.1.1.39
Find proteins for P04718 (Rhodospirillum rubrum)
Explore P04718 
Go to UniProtKB:  P04718
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Observed: 0.207 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.5α = 90
b = 69.3β = 92.1
c = 103.1γ = 90
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-09-07
    Changes: Structure summary
  • Version 1.4: 2017-11-29
    Changes: Derived calculations, Other