8EXW | pdb_00008exw

Drosophila melanogaster indirect flight muscle myosin II (subfragment-1)

• PDB DOI: https://doi.org/10.2210/pdb8EXW/pdb

• Classification: MOTOR PROTEIN
• Organism(s): Drosophila melanogaster
• Expression System: Drosophila melanogaster
• Mutation(s): No 


• Deposited: 2022-10-25 Released: 2024-02-07 
• Deposition Author(s): Caldwell, J.T., Huxford, T., Bernstein, S.I., Stec, B.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 
  0.245 (Depositor), 0.244 (DCC) 
• R-Value Work: 
  0.188 (Depositor), 0.188 (DCC) 
• R-Value Observed: 
  0.191 (Depositor) 

Starting Model: other

Literature

Drosophila melanogaster indirect flight muscle myosin II (subfragment-1)

Caldwell, J.T., Huxford, T., Bernstein, S.I., Stec, B.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content 

• Total Structure Weight: 109.54 kDa 
• Atom Count: 7,624 
• Modeled Residue Count: 933 
• Deposited Residue Count: 963 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Isoform K of Myosin heavy chain, muscle	A	808	Drosophila melanogaster	Mutation(s): 0  Gene Names: Mhc, CG17927
UniProt
Find proteins for P05661 (Drosophila melanogaster) Explore P05661  Go to UniProtKB:  P05661

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Myosin light chain alkali	B	155	Drosophila melanogaster	Mutation(s): 0  Gene Names: Mlc1, MLC-ALK, CG5596
UniProt
Find proteins for P06742 (Drosophila melanogaster) Explore P06742  Go to UniProtKB:  P06742

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP (Subject of Investigation/LOI)	D [auth A]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG	C [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free:  0.245 (Depositor), 0.244 (DCC) 
• R-Value Work:  0.188 (Depositor), 0.188 (DCC) 
• R-Value Observed: 0.191 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 42.394	α = 90
b = 126.806	β = 90.13
c = 92.581	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
PHENIX	refinement
XDS	data reduction
XDS	data scaling
BALBES	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2024-02-07 
Deposition Author(s): Caldwell, J.T., Huxford, T., Bernstein, S.I., Stec, B.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R37GM032443

Revision History  

• Version 1.0: 2024-02-07
  Type: Initial release
  
• Version 1.1: 2026-03-04
  Changes: Refinement description, Structure summary