1N1X

Crystal Structure Analysis of the monomeric [S-carboxyamidomethyl-Cys31, S-carboxyamidomethyl-Cys32] Bovine seminal ribonuclease


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The unswapped chain of bovine seminal ribonuclease: Crystal structure of the free and liganded monomeric derivative

Sica, F.Di Fiore, A.Zagari, A.Mazzarella, L.

(2003) Proteins 52: 263-271

  • DOI: 10.1002/prot.10407
  • Primary Citation of Related Structures:  
  • Also Cited By: 3BCP, 3BCO, 3BCM, 1TQ9

  • PubMed Abstract: 
  • Bovine seminal ribonuclease, a homodimeric enzyme joined covalently by two interchain disulphide bonds, is an equilibrium mixture of two conformational isomers, MxM and M=M. The major form, MxM, whose crystal structure has been previously determined ...

    Bovine seminal ribonuclease, a homodimeric enzyme joined covalently by two interchain disulphide bonds, is an equilibrium mixture of two conformational isomers, MxM and M=M. The major form, MxM, whose crystal structure has been previously determined at 1.9 A resolution, presents the swapping of the N-terminal segments (residues 1-15) and composite active sites formed by residues of different chains. The three-dimensional domain swapping does not occur in the M=M form. The different fold of each N-terminal tail is directed by the hinge loop (residue 16-22) connecting the swapping domain to the body of the protein. Reduction and alkylation of interchain disulphide bridges produce a monomeric derivative and a noncovalent swapped dimer, which are both active. The free and nucleotide-bound forms of the monomer have been crystallized at an alkaline pH and refined at 1.45 and 1.65 A resolution, respectively. In both cases, the N-terminal fragment is folded on the main body of the protein to produce an intact active site and a chain architecture very similar to that of bovine pancreatic ribonuclease. In this new fold of the seminal chain, the hinge loop is disordered. Despite the difference between the tertiary structure of the monomer and that of the chains in the MxM form, the active sites of the two enzymes are virtually indistinguishable. Furthermore, the structure of the liganded enzyme represents the first example of a ribonuclease complex studied at an alkaline pH and provides new information on the binding of a nucleotide when the catalytic histidines are deprotonated.


    Related Citations: 
    • Assignment and secondary-structure determination of monomeric bovine seminal ribonuclease employing computer-assisted evaluation of homonuclear three-dimensional 1H-NMR spectra
      D'Ursi, A.,Oschkinat, H.,Cieslar, C.,Picone, D.,D'Alessio, G.,Amodeo, P.,Temussi, P.
      (1995) Eur.J.Biochem. 229: 494
    • Bovine seminal ribonuclease: structure at 1.9 A resolution
      Mazzarella, L.,Capasso, S.,Demasi, D.,Di Lorenzo, G.,Mattia, C.A.,Zagari, A.
      (1993) Acta Crystallogr.,Sect.D 49: 389
    • Swapping structural determinants of ribonucleases: an energetic analysis of the hinge peptide 16-22
      Mazzarella, L.,Vitagliano, L.,Zagari, A.
      (1995) Proc.Natl.Acad.Sci.USA 92: 3799
    • Crystallization of multiple forms of bovine seminal ribonuclease in the liganded and unliganded state.
      Sica, F.,Adinolfi, S.,Berisio, R.,De Lorenzo, C.,Mazzarella, L.,Piccoli, R.,Vitagliano, L.,Zagari, A.
      (1999) J.CRYST.GROWTH 196: 305


    Organizational Affiliation

    Dipartimento di Chimica, Università degli Studi di Napoli Federico II, Napoli, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease, seminal
A
124Bos taurusMutation(s): 0 
Gene Names: SRN
EC: 4.6.1.18
Find proteins for P00669 (Bos taurus)
Go to UniProtKB:  P00669
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
YCM
Query on YCM
A
L-PEPTIDE LINKINGC5 H10 N2 O3 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.205 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 70.390α = 90.00
b = 28.730β = 119.00
c = 67.410γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
X-PLORrefinement
AMoREphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-08-26
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance