Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 39023.18 
• Atom Count: 2320 
• Residue Count: 341 
• Unique protein chains: 1

1S9J

X-ray structure of the human mitogen-activated protein kinase kinase 1 (MEK1) in a complex with ligand and MgATP

• DOI: 10.2210/pdb1S9J/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2004-02-04 Released: 2004-11-23 
• Deposition Author(s): Ohren, J.F., Chen, H., Pavlovsky, A., Whitehead, C., Yan, C., McConnell, P., Delaney, A., Dudley, D.T., Sebolt-Leopold, J., Hasemann, C.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.269 
• R-Value Work: 0.245 

Literature

Structures of human MAP kinase kinase 1 (MEK1) and MEK2 describe novel noncompetitive kinase inhibition.

Ohren, J.F., Chen, H., Pavlovsky, A., Whitehead, C., Zhang, E., Kuffa, P., Yan, C., McConnell, P., Spessard, C., Banotai, C., Mueller, W.T., Delaney, A., Omer, C., Sebolt-Leopold, J., Dudley, D.T., Leung, I.K., Flamme, C., Warmus, J., Kaufman, M., Barrett, S., Tecle, H., Hasemann, C.A.

(2004) Nat.Struct.Mol.Biol. 11: 1192-1197

• PubMed: 15543157 
• DOI: 10.1038/nsmb859
• Primary Citation of Related Structures:  
  1S9I
• Also Cited By: 3EQB, 3DY7


• PubMed Abstract: 
  

MEK1 and MEK2 are closely related, dual-specificity tyrosine/threonine protein kinases found in the Ras/Raf/MEK/ERK mitogen-activated protein kinase (MAPK) signaling pathway. Approximately 30% of all human cancers have a constitutively activated MAPK pathway, and constitutive activation of MEK1 results in cellular transformation. Here we present the X-ray structures of human MEK1 and MEK2, each determined as a ternary complex with MgATP and an inhibitor to a resolution of 2.4 A and 3.2 A, respectively. The structures reveal that MEK1 and MEK2 each have a unique inhibitor-binding pocket adjacent to the MgATP-binding site. The presence of the potent inhibitor induces several conformational changes in the unphosphorylated MEK1 and MEK2 enzymes that lock them into a closed but catalytically inactive species. Thus, the structures reported here reveal a novel, noncompetitive mechanism for protein kinase inhibition.

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Organizational Affiliation: 

Department of Discovery Technologies, Pfizer Global Research & Development, 2800 Plymouth Road, Ann Arbor, Michigan 48105, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Dual specificity mitogen-activated protein kinase kinase 1	A	341	Homo sapiens	Mutation(s): 0  Gene Names: MAP2K1 (MEK1, PRKMK1) EC: 2.7.12.2
Find proteins for Q02750 (Homo sapiens) Go to Gene View: MAP2K1 Go to UniProtKB:  Q02750

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ATP	A	ADENOSINE-5'-TRIPHOSPHATE C10 H16 N5 O13 P3 ZKHQWZAMYRWXGA-KQYNXXCUSA-N
MG	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N
BBM	A	5-BROMO-N-(2,3-DIHYDROXYPROPOXY)-3,4-DIFLUORO-2-[(2-FLUORO-4-IODOPHENYL)AMINO]BENZAMIDE C16 H13 Br F3 I N2 O4 XXSSGBYXSKOLAM-QMMMGPOBSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.269 
• R-Value Work: 0.245 
• Space Group: P 6₂

Unit Cell:

Length (Å)	Angle (°)
a = 81.591	α = 90.00
b = 81.591	β = 90.00
c = 129.213	γ = 120.00

Software Package:

Software Name	Purpose
CNX	phasing
REFMAC	refinement
CCP4	data scaling
HKL-2000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-02-04 
• Released Date: 2004-11-23 
• Deposition Author(s): Ohren, J.F., Chen, H., Pavlovsky, A., Whitehead, C., Yan, C., McConnell, P., Delaney, A., Dudley, D.T., Sebolt-Leopold, J., Hasemann, C.A.

Revision History 

• Version 1.0: 2004-11-23
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Advisory, Version format compliance