3MYK

Insights into the Importance of Hydrogen Bonding in the Gamma-Phosphate Binding Pocket of Myosin: Structural and Functional Studies of Ser236


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Insights into the importance of hydrogen bonding in the gamma-phosphate binding pocket of myosin: structural and functional studies of serine 236

Frye, J.J.Klenchin, V.A.Bagshaw, C.R.Rayment, I.

(2010) Biochemistry 49: 4897-4907

  • DOI: 10.1021/bi1001344
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The active site of myosin contains a group of highly conserved amino acid residues whose roles in nucleotide hydrolysis and energy transduction might appear to be obvious from the initial structural and kinetic analyses but become less clear on deepe ...

    The active site of myosin contains a group of highly conserved amino acid residues whose roles in nucleotide hydrolysis and energy transduction might appear to be obvious from the initial structural and kinetic analyses but become less clear on deeper investigation. One such residue is Ser236 (Dictyostelium discoideum myosin II numbering) which was proposed to be involved in a hydrogen transfer network during gamma-phosphate hydrolysis of ATP, which would imply a critical function in ATP hydrolysis and motility. The S236A mutant protein shows a comparatively small decrease in hydrolytic activity and motility, and thus this residue does not appear to be essential. To understand better the contribution of Ser236 to the function of myosin, structural and kinetic studies have been performed on the S236A mutant protein. The structures of the D. discoideum motor domain (S1dC) S236A mutant protein in complex with magnesium pyrophosphate, MgAMPPNP, and MgADP.vanadate have been determined. In contrast to the previous structure of wild-type S1dC, the S236A.MgAMPPNP complex crystallized in the closed state. Furthermore, transient-state kinetics showed a 4-fold reduction of the nucleotide release step, suggesting that the mutation stabilizes a closed active site. The structures show that a water molecule approximately adopts the location of the missing hydroxyl of Ser236 in the magnesium pyrophosphate and MgAMPPNP structures. This study suggests that the S236A mutant myosin proceeds via a different structural mechanism than wild-type myosin, where the alternate mechanism is able to maintain near normal transient-state kinetic values.


    Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myosin-2 heavy chain
X
762Dictyostelium discoideumMutation(s): 1 
Gene Names: mhcA
Find proteins for P08799 (Dictyostelium discoideum)
Go to UniProtKB:  P08799
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BIT
Query on BIT

Download SDF File 
Download CCD File 
X
(-)-1-PHENYL-1,2,3,4-TETRAHYDRO-4-HYDROXYPYRROLO[2,3-B]-7-METHYLQUINOLIN-4-ONE
(S)-BLEBBISTATIN, (3AS)-3A-HYDROXY-6-METHYL-1-PHENYL-3,3A-DIHYDRO-1H-PYRROLO[2,3-B]QUINOLIN-4(2H)-ONE
C18 H16 N2 O2
LZAXPYOBKSJSEX-GOSISDBHSA-N
 Ligand Interaction
ANP
Query on ANP

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Download CCD File 
X
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.193 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 88.005α = 90.00
b = 147.021β = 90.00
c = 153.425γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
REFMACrefinement
HKL-2000data collection
MOLREPphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-05-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-09-14
    Type: Other