1B6I

T4 LYSOZYME MUTANT WITH CYS 54 REPLACED BY THR, CYS 97 REPLACED BY ALA, THR 21 REPLACED BY CYS AND LYS 124 REPLACED BY CYS (C54T,C97A,T21C,K124C)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Solid-state synthesis and mechanical unfolding of polymers of T4 lysozyme.

Yang, G.Cecconi, C.Baase, W.A.Vetter, I.R.Breyer, W.A.Haack, J.A.Matthews, B.W.Dahlquist, F.W.Bustamante, C.

(2000) Proc.Natl.Acad.Sci.USA 97: 139-144


  • PubMed Abstract: 
  • Recent advances in single molecule manipulation methods offer a novel approach to investigating the protein folding problem. These studies usually are done on molecules that are naturally organized as linear arrays of globular domains. To extend thes ...

    Recent advances in single molecule manipulation methods offer a novel approach to investigating the protein folding problem. These studies usually are done on molecules that are naturally organized as linear arrays of globular domains. To extend these techniques to study proteins that normally exist as monomers, we have developed a method of synthesizing polymers of protein molecules in the solid state. By introducing cysteines at locations where bacteriophage T4 lysozyme molecules contact each other in a crystal and taking advantage of the alignment provided by the lattice, we have obtained polymers of defined polarity up to 25 molecules long that retain enzymatic activity. These polymers then were manipulated mechanically by using a modified scanning force microscope to characterize the force-induced reversible unfolding of the individual lysozyme molecules. This approach should be general and adaptable to many other proteins with known crystal structures. For T4 lysozyme, the force required to unfold the monomers was 64 +/- 16 pN at the pulling speed used. Refolding occurred within 1 sec of relaxation with an efficiency close to 100%. Analysis of the force versus extension curves suggests that the mechanical unfolding transition follows a two-state model. The unfolding forces determined in 1 M guanidine hydrochloride indicate that in these conditions the activation barrier for unfolding is reduced by 2 kcal/mol.


    Organizational Affiliation

    Department of Molecular Biology, University of California, Berkeley, CA 94720, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (LYSOZYME)
A
164Enterobacteria phage T4Mutation(s): 0 
Gene Names: E
EC: 3.2.1.17
Find proteins for P00720 (Enterobacteria phage T4)
Go to UniProtKB:  P00720
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HED
Query on HED

Download SDF File 
Download CCD File 
A
2-HYDROXYETHYL DISULFIDE
C4 H10 O2 S2
KYNFOMQIXZUKRK-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.185 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 60.870α = 90.00
b = 60.870β = 90.00
c = 96.730γ = 120.00
Software Package:
Software NamePurpose
UCSD-systemdata reduction
UCSD-systemdata scaling
TNTrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-01-12
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description
  • Version 1.4: 2018-04-04
    Type: Data collection