1CWT

HUMAN CDC25B CATALYTIC DOMAIN WITH METHYL MERCURY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the catalytic subunit of Cdc25B required for G2/M phase transition of the cell cycle.

Reynolds, R.A.Yem, A.W.Wolfe, C.L.Deibel Jr., M.R.Chidester, C.G.Watenpaugh, K.D.

(1999) J.Mol.Biol. 293: 559-568

  • DOI: 10.1006/jmbi.1999.3168
  • Primary Citation of Related Structures:  1CWR, 1CWS, 1QB0
  • Also Cited By: 2UZQ

  • PubMed Abstract: 
  • Cdc25B is a dual specificity phosphatase involved in the control of cyclin-dependent kinases and the progression of cells through the cell cycle. A series of minimal domain Cdc25B constructs maintaining catalytic activity have been expressed. The str ...

    Cdc25B is a dual specificity phosphatase involved in the control of cyclin-dependent kinases and the progression of cells through the cell cycle. A series of minimal domain Cdc25B constructs maintaining catalytic activity have been expressed. The structure of a minimum domain construct binding sulfate was determined at 1.9 A resolution and a temperature of 100 K. Other forms of the same co?nstruct were determined at lower resolution and room temperature. The overall folding and structure of the domain is similar to that found for Cdc25A. An important difference between the two is that the Cdc25B domain binds oxyanions in the catalytic site while that of Cdc25A appears unable to bind oxyanions. There are also important conformational differences in the C-terminal region. In Cdc25B, both sulfate and tungstate anions are shown to bind in the catalytic site containing the signature motif (HCxxxxxR) in a conformation similar to that of other protein tyrosine phosphatases and dual specificity phosphatases, with the exception of the Cdc25A. The Cdc25B constructs, with various truncations of the C-terminal residues, are shown to have potent catalytic activity. When cut back to the site at which the Cdc25A structure begins to deviate from the Cdc25B structure, the activity is considerably less. There is a pocket extending from the catalytic site to an anion-binding site containing a chloride about 14 A away. The catalytic cysteine residue, Cys473, can be oxidized to form a disulfide linkage to Cys426. A readily modifiable cysteine residue, Cys484, resides in another pocket that binds a sulfate but not in the signature motif conformation. This region of the structure is highly conserved between the Cdc25 molecules and could serve some unknown function.


    Organizational Affiliation

    Department of Physics, Grand Valley State University, Allendale, MI, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CDC25 B-TYPE TYROSINE PHOSPHATASE
A
178Homo sapiensGene Names: CDC25B (CDC25HU2)
EC: 3.1.3.48
Find proteins for P30305 (Homo sapiens)
Go to Gene View: CDC25B
Go to UniProtKB:  P30305
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
MMC
Query on MMC

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Download CCD File 
A
METHYL MERCURY ION
C H3 Hg
DBUXSCUEGJMZAE-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 52.166α = 90.00
b = 72.378β = 90.00
c = 75.553γ = 90.00
Software Package:
Software NamePurpose
SHELXL-97refinement
SAINTdata scaling
SADIEdata reduction
XTALphasing
XTAL3.0model building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-08-30
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance