Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 37033.71 
• Atom Count: 2564 
• Residue Count: 325 
• Unique protein chains: 1

1BG2

HUMAN UBIQUITOUS KINESIN MOTOR DOMAIN

• DOI: 10.2210/pdb1BG2/pdb

• Classification: MOTOR PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 1998-06-04 Released: 1998-10-14 
• Deposition Author(s): Kull, F.J., Sablin, E.P., Lau, R., Fletterick, R.J., Vale, R.D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.288 
• R-Value Work: 0.216 

Literature

Crystal structure of the kinesin motor domain reveals a structural similarity to myosin.

Kull, F.J., Sablin, E.P., Lau, R., Fletterick, R.J., Vale, R.D.

(1996) Nature 380: 550-555

• PubMed: 8606779 
• DOI: 10.1038/380550a0


• PubMed Abstract: 
  

Kinesin is the founding member of a superfamily of microtubule based motor proteins that perform force-generating tasks such as organelle transport and chromosome segregation. It has two identical approximately 960-amino-acid chains containing an amino-terminal globular motor domain, a central alpha-helical region that enables dimer formation through a coiled-coil, and a carboxy-terminal tail domain that binds light chains and possibly an organelle receptor. The kinesin motor domain of approximately 340 amino acids, which can produce movement in vitro, is much smaller than that of myosin (approximately 850 amino acids) and dynein (1,000 amino acids), and is the smallest known molecular motor. Here, we report the crystal structure of the human kinesin motor domain with bound ADP determined to 1.8-A resolution by X-ray crystallography. The motor consists primarily of a single alpha/beta arrowhead-shaped domain with dimensions of 70 x 45 x 45 A. Unexpectedly, it has a striking structural similarity to the core of the catalytic domain of the actin-based motor myosin. Although kinesin and myosin have virtually no amino-acid sequence++ identity, and exhibit distinct enzymatic and motile properties, our results suggest that these two classes of mechanochemical enzymes evolved from a common ancestor and share a similar force-generating strategy.

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Organizational Affiliation: 

Department of Biochemistry/Biophysics, University of California, San Francisco, California 94143, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
KINESIN	A	325	Homo sapiens	Mutation(s): 0  Gene Names: KIF5B (KNS, KNS1)
Find proteins for P33176 (Homo sapiens) Go to Gene View: KIF5B Go to UniProtKB:  P33176

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ACT	A	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M
ADP	A	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.288 
• R-Value Work: 0.216 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 48.540	α = 90.00
b = 67.940	β = 90.00
c = 112.950	γ = 90.00

Software Package:

Software Name	Purpose
DENZO	data reduction
X-PLOR	phasing
X-PLOR	refinement
SCALEPACK	data scaling
X-PLOR	model building

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-06-04 
• Released Date: 1998-10-14 
• Deposition Author(s): Kull, F.J., Sablin, E.P., Lau, R., Fletterick, R.J., Vale, R.D.

Revision History 

• Version 1.0: 1998-10-14
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance