3EQC: PDB entry 3EQC

X-ray structure of the human mitogen-activated protein kinase kinase 1 (MEK1) in a ternary complex with compound 1, ATP-GS AND MG2P. Determined by X-ray diffraction at 1.8 Å resolution. Released 24 Feb 2009.

Method: X-ray diffraction
Resolution: 1.8 Å
Organism: Homo sapiens
Chains: 1
Atoms: 2,688
Mol. weight: 41.22 kDa
Ligands: 3BM, AGS, MG, CA
Released: 24 Feb 2009

Explore 3EQC in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

3EQC contains 20 α-helices and 9 β-strands across 1 chain. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.

Chain A: 20 helices, 9 β-strands

Element	Residues	Length	Sheet
α-helix	41-43	3
α-helix	44-58	15
α-helix	65-67	3
β-strand	68-76	9	1
β-strand	81-87	7	1
β-strand	93-100	8	1
α-helix	105-115	11
α-helix	116-120	5
β-strand	126	1	2
β-strand	129-135	7	1
β-strand	138-143	6	1
β-strand	150	1	2
α-helix	151-158	8
α-helix	163-184	22
α-helix	193-195	3
β-strand	196-198	3	2
β-strand	204-206	3	2
α-helix	213-218	6
α-helix	232-235	4
α-helix	242-258	17
α-helix	265-267	3
α-helix	268-275	8
α-helix	310-319	10
α-helix	321-323	3
α-helix	325-326	2
α-helix	332-342	11
α-helix	352-356	5
α-helix	359-366	8
α-helix	371-379	9

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Dual specificity mitogen-activated protein kinase kinase 1	A	protein	360	Homo sapiens	Q02750 (AlphaFold model)

Sequence of entity 1 (A), FASTA

>3EQC_1 Dual specificity mitogen-activated protein kinase kinase 1 (chains A)
GKKLEELELDEQQRKRLEAFLTQKQKVGELKDDDFEKISELGAGNGGVVFKVSHKPSGLV
MARKLIHLEIKPAIRNQIIRELQVLHECNSPYIVGFYGAFYSDGEISICMEHMDGGSLDQ
VLKKAGRIPEQILGKVSIAVIKGLTYLREKHKIMHRDVKPSNILVNSRGEIKLCDFGVSG
QLIDSMANSFVGTRSYMSPERLQGTHYSVQSDIWSMGLSLVEMAVGRYPIPPPDAKELEL
MFGCQVEGDAAETPPRPRTPGRPLNKFGMDSRPPMAIFELLDYIVNEPPPKLPSGVFSLE
FQDFVNKCLIKNPAERADLKQLMVHAFIKRSDAEEVDFAGWLCSTIGLNQPSTPTHAAGV

Ligands and cofactors

ID	Name	Formula	Copies
3BM	2-[(2-chloro-4-iodophenyl)amino]-N-{[(2R)-2,3-dihydroxypropyl]oxy}-3,4-difluoro…	C16 H14 Cl F2 I N2 O4	1
AGS	Phosphothiophosphoric acid-adenylate ester	C10 H16 N5 O12 P3 S	1
MG	Magnesium ion	Mg	1
CA	Calcium ion	Ca	1

Water and common crystallization additives (NA) are not listed.

Primary citation

Crystal Structures of MEK1 Binary and Ternary Complexes with Nucleotides and Inhibitors. Fischmann, T.O., Smith, C.K., Mayhood, T.W. et al. Biochemistry (2009) 48:2661-2674. DOI 10.1021/bi801898e · PubMed

Other PDB entries of the same protein (UniProt Q02750 (AlphaFold model), which also has an AlphaFold model), best resolution first:

7B7R 1.7 Å, MEK1 in complex with compound 4
7B9L 1.7 Å, MEK1 in complex with compound 23
3EQI 1.9 Å, X-ray structure of the human mitogen-activated protein kinase kinase 1 (MEK1) in a…
3EQH 2.0 Å, X-ray structure of the human mitogen-activated protein kinase kinase 1 (MEK1) in a…
3VVH 2.0 Å, X-ray structure of the human mitogen-activated protein kinase kinase 1 (MEK1) in complex…
7B94 2.0 Å, MEK1 in complex with compound 6
7F2X 2.01 Å, Crystal structure of MEK1 C121S mutant
9AXX 2.07 Å, Crystal structure of BRAF/MEK1 complex with NST-628 and an active RAF dimer
3EQD 2.1 Å, X-ray structure of the human mitogen-activated protein kinase kinase 1 (MEK1) in a…
4AN3 2.1 Å, Crystal structures of human MEK1 with carboxamide-based allosteric inhibitor XL518…
7XLP 2.1 Å, MEK1 bound to DS03090629
7XNC 2.1 Å, MEK1 bound to DS94070624

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