Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 102878.86 
• Atom Count: 7172 
• Residue Count: 893 
• Unique protein chains: 2

4L79

Crystal Structure of nucleotide-free Myosin 1b residues 1-728 with bound Calmodulin

• DOI: 10.2210/pdb4L79/pdb

• Classification: MOTOR PROTEIN/METAL BINDING PROTEIN
• Organism(s): Rattus norvegicus, Homo sapiens
• Expression System: Spodoptera frugiperda


• Deposited: 2013-06-13 Released: 2014-01-29 
• Deposition Author(s): Shuman, H., Zwolak, A., Dominguez, R., Ostap, E.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Free: 0.249 
• R-Value Work: 0.189 

Literature

A vertebrate myosin-I structure reveals unique insights into myosin mechanochemical tuning.

Shuman, H., Greenberg, M.J., Zwolak, A., Lin, T., Sindelar, C.V., Dominguez, R., Ostap, E.M.

(2014) Proc.Natl.Acad.Sci.USA 111: 2116-2121

• PubMed: 24469830 
• DOI: 10.1073/pnas.1321022111
• Also Cited By: 5V7X


• PubMed Abstract: 
  

Myosins are molecular motors that power diverse cellular processes, such as rapid organelle transport, muscle contraction, and tension-sensitive anchoring. The structural adaptations in the motor that allow for this functional diversity are not known, due, in part, to the lack of high-resolution structures of highly tension-sensitive myosins. We determined a 2.3-Å resolution structure of apo-myosin-Ib (Myo1b), which is the most tension-sensitive myosin characterized. We identified a striking unique orientation of structural elements that position the motor's lever arm. This orientation results in a cavity between the motor and lever arm that holds a 10-residue stretch of N-terminal amino acids, a region that is divergent among myosins. Single-molecule and biochemical analyses show that the N terminus plays an important role in stabilizing the post power-stroke conformation of Myo1b and in tuning the rate of the force-sensitive transition. We propose that this region plays a general role in tuning the mechanochemical properties of myosins.

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Organizational Affiliation: 

Pennsylvania Muscle Institute and Department of Physiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Unconventional myosin-Ib	A	744	Rattus norvegicus	Mutation(s): 0  Gene Names: Myo1b (Myo1a, Myr1)
Find proteins for Q05096 (Rattus norvegicus) Go to UniProtKB:  Q05096

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Calmodulin	B	149	Homo sapiens	Mutation(s): 0  Gene Names: CALM3 (CALML2, CAM3, CAMC, CAMIII)
Find proteins for P0DP25 (Homo sapiens) Go to Gene View: CALM3 Go to UniProtKB:  P0DP25

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MG	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Free: 0.249 
• R-Value Work: 0.189 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 114.184	α = 90.00
b = 45.090	β = 117.18
c = 115.547	γ = 90.00

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
ADSC	data collection
PHENIX	model building
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-06-13 
• Released Date: 2014-01-29 
• Deposition Author(s): Shuman, H., Zwolak, A., Dominguez, R., Ostap, E.M.

Revision History 

• Version 1.0: 2014-01-29
  Type: Initial release
• Version 1.1: 2014-02-26
  Type: Database references