1FYS

Ribonuclease T1 V16C mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.174 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Hydrophobic core manipulations in ribonuclease T1.

De Vos, S.Backmann, J.Prevost, M.Steyaert, J.Loris, R.

(2001) Biochemistry 40: 10140-10149

  • DOI: 10.1021/bi010565n
  • Primary Citation of Related Structures:  
    1G02, 1I2G, 1I2F, 1I2E, 1I3I, 1I3F, 1FYS, 1FZU

  • PubMed Abstract: 
  • Differential scanning calorimetry, urea denaturation, and X-ray crystallography were combined to study the structural and energetic consequences of refilling an engineered cavity in the hydrophobic core of RNase T1 with CH(3), SH, and OH groups. Three valines that cluster together in the major hydrophobic core of T1 were each replaced with Ala, Ser, Thr, and Cys ...

    Differential scanning calorimetry, urea denaturation, and X-ray crystallography were combined to study the structural and energetic consequences of refilling an engineered cavity in the hydrophobic core of RNase T1 with CH(3), SH, and OH groups. Three valines that cluster together in the major hydrophobic core of T1 were each replaced with Ala, Ser, Thr, and Cys. Compared to the wild-type protein, all these mutants reduce the thermodynamic stability of the enzyme considerably. The relative order of stability at all three positions is as follows: Val > Ala approximately equal to Thr > Ser. The effect of introducing a sulfhydryl group is more variable. Surprisingly, a Val --> Cys mutation in a hydrophobic environment can be as or even more destabilizing than a Val --> Ser mutation. Furthermore, our results reveal that the penalty for introducing an OH group into a hydrophobic cavity is roughly the same as the gain obtained from filling the cavity with a CH(3) group. The inverse equivalence of the behavior of hydroxyl and methyl groups seems to be crucial for the unique three-dimensional structure of the proteins. The importance of negative design elements in this context is highlighted.


    Organizational Affiliation

    Laboratorium voor Ultrastructuur, Vlaams Interuniversitair Instituut voor Biotechnologie, Vrije Universiteit Brussel, Paardenstraat 65, B-1640 Sint-Genesius-Rode, Belgium. stedevos@vub.ac.be



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GUANYL-SPECIFIC RIBONUCLEASE T1A104Aspergillus oryzaeMutation(s): 1 
EC: 3.1.27.3 (PDB Primary Data), 4.6.1.24 (UniProt)
UniProt
Find proteins for P00651 (Aspergillus oryzae (strain ATCC 42149 / RIB 40))
Explore P00651 
Go to UniProtKB:  P00651
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2GP
Query on 2GP

Download Ideal Coordinates CCD File 
D [auth A]GUANOSINE-2'-MONOPHOSPHATE
C10 H14 N5 O8 P
WTIFIAZWCCBCGE-UUOKFMHZSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.174 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.445α = 90
b = 42.679β = 90
c = 56.651γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
X-PLORrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-10-25
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance