1G8X

STRUCTURE OF A GENETICALLY ENGINEERED MOLECULAR MOTOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Structure of a genetically engineered molecular motor.

Kliche, W.Fujita-Becker, S.Kollmar, M.Manstein, D.J.Kull, F.J.

(2001) EMBO J. 20: 40-46

  • DOI: 10.1093/emboj/20.1.40

  • PubMed Abstract: 
  • Molecular motors move unidirectionally along polymer tracks, producing movement and force in an ATP-dependent fashion. They achieve this by amplifying small conformational changes in the nucleotide-binding region into force-generating movements of la ...

    Molecular motors move unidirectionally along polymer tracks, producing movement and force in an ATP-dependent fashion. They achieve this by amplifying small conformational changes in the nucleotide-binding region into force-generating movements of larger protein domains. We present the 2.8 A resolution crystal structure of an artificial actin-based motor. By combining the catalytic domain of myosin II with a 130 A conformational amplifier consisting of repeats 1 and 2 of alpha-actinin, we demonstrate that it is possible to genetically engineer single-polypeptide molecular motors with precisely defined lever arm lengths and specific motile properties. Furthermore, our structure shows the consequences of mutating a conserved salt bridge in the nucleotide-binding region. Disruption of this salt bridge, which is known to severely inhibit ATP hydrolysis activity, appears to interfere with formation of myosin's catalytically active 'closed' conformation. Finally, we describe the structure of alpha-actinin repeats 1 and 2 as being composed of two rigid, triple-helical bundles linked by an uninterrupted alpha-helix. This fold is very similar to the previously described structures of alpha-actinin repeats 2 and 3, and alpha-spectrin repeats 16 and 17.


    Organizational Affiliation

    Department of Biophysics, Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany. kull@mpimf-heidelberg.mpg.de




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MYOSIN II HEAVY CHAIN FUSED TO ALPHA-ACTININ 3
A, B
1010Dictyostelium discoideumGene Names: mhcA, abpA (actnA)
Find proteins for P08799 (Dictyostelium discoideum)
Go to UniProtKB:  P08799
Find proteins for P05095 (Dictyostelium discoideum)
Go to UniProtKB:  P05095
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
A, B
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.232 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 135.423α = 90.00
b = 155.420β = 90.00
c = 143.191γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
XDSdata scaling
AMoREphasing
MAR345data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-01-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-07-26
    Type: Refinement description, Source and taxonomy
  • Version 1.4: 2017-10-04
    Type: Refinement description