2MSP

MAJOR SPERM PROTEIN, BETA ISOFORM, ENGINEERED C59S/T90C MUTANT, PUTATIVE SUBFILAMENT STRUCTURE, PH 8.5

• PDB DOI: https://doi.org/10.2210/pdb2MSP/pdb

• Classification: CELL MOTILITY PROTEIN
• Organism(s): Ascaris suum
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 1997-12-19 Released: 1998-04-15 
• Deposition Author(s): Bullock, T.L., Mccoy, A.J., Stewart, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.30 Å
• R-Value Free: 
  0.260 (Depositor) 
• R-Value Work: 
  0.218 (Depositor) 
• R-Value Observed: 
  0.220 (Depositor) 

Starting Model: experimental

Literature

Structural basis for amoeboid motility in nematode sperm.

Bullock, T.L., McCoy, A.J., Kent, H.M., Roberts, T.M., Stewart, M.

(1998) Nat Struct Biol 5: 184-189

• PubMed: 9501910 
• DOI: https://doi.org/10.1038/nsb0398-184
• Primary Citation of Related Structures:  
  2MSP


• PubMed Abstract: 
  

  Cell locomotion in amoeboid nematode sperm is generated by the vectorial assembly and bundling of filaments of the major sperm protein (MSP). MSP filaments are constructed from two helical subfilaments and here we describe the structure of putative MSP subfilament helices determined by X-ray crystallography at 3.3 A resolution. In addition to establishing the interfaces involved in polymerization, this structural model shows that the MSP helices are constructed from dimers and have no overall polarity, suggesting that it is unlikely that molecular motors play a direct role in the generation of protrusive force in these amoeboid cells.

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Organizational Affiliation: 

MRC Laboratory of Molecular Biology, Cambridge, UK.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 112.97 kDa 
• Atom Count: 7,824 
• Modelled Residue Count: 992 
• Deposited Residue Count: 1,008 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MAJOR SPERM PROTEIN	A, B, C, D, E, F, G, H	126	Ascaris suum	Mutation(s): 2  Gene Names: BETA MSP C59S/T90C
UniProt
Find proteins for P27440 (Ascaris suum) Explore P27440  Go to UniProtKB:  P27440

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.30 Å
• R-Value Free:  0.260 (Depositor) 
• R-Value Work:  0.218 (Depositor) 
• R-Value Observed: 0.220 (Depositor) 

Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 79.66	α = 90
b = 79.66	β = 90
c = 463.79	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
MLPHARE	phasing
SOLOMON	phasing
TNT	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-04-15 
Deposition Author(s): Bullock, T.L., Mccoy, A.J., Stewart, M.

Revision History  

• Version 1.0: 1998-04-15
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-11-03
  Changes: Database references
• Version 1.4: 2023-08-09
  Changes: Refinement description
• Version 1.5: 2024-05-22
  Changes: Data collection