Mitogen-activated protein kinase kinase

Mitogen-activated protein kinase kinase [sic] (also known as MAP2K) is a kinase enzyme which phosphorylates mitogen-activated protein kinase (MAPK).

MAP2K is classified as EC 2.7.12.2.

There are seven genes:

MAP2K1 (aka MEK1)
MAP2K2 (aka MEK2)
MAP2K3 (aka MKK3)
MAP2K4 (aka MKK4}
MAP2K5 (aka MKK5)
MAP2K6 (aka MKK6)
MAP2K7 (aka MKK7)

The activators of p38 (MKK3 and MKK6), JNK (MKK4 and MKK7), and ERK (MEK1 and MEK2) define independent MAP kinase signal transduction pathways.^[1]

References

^ Dérijard B, et al. (1995). "Independent human MAP-kinase signal transduction pathways defined by MEK and MKK isoforms". Science 267 (5198): 682–5. doi:10.1126/science.7839144. PMID 7839144.

External links

MeSH Mitogen-Activated+Protein+Kinase+Kinases

MAP kinase activation

Initiation	Mitogen

MAP kinase kinase kinase (MAP3K or MKKK)	MAP kinase kinase kinases (MAP3K1, MAP3K2, MAP3K3, MAP3K4, MAP3K5, MAP3K6, MAP3K7, MAP3K8) RAFs (ARAF, BRAF, KSR1, KSR2) MLKs (MAP3K12, MAP3K13, MAP3K9, MAP3K10, MAP3K11, MAP3K7, ZAK) CDC7

MAP kinase kinase (MAP2K or MKK)	MAP2K1, MAP2K2, MAP2K3, MAP2K4, MAP2K5, MAP2K6, MAP2K7

MAP kinase	Extracellular signal-regulated (MAPK1, MAPK3, MAPK4, MAPK6, MAPK7, MAPK12, MAPK15), C-Jun N-terminal (MAPK8, MAPK9, MAPK10), P38 mitogen-activated protein (MAPK11, MAPK13, MAPK14)

Phosphatase	MAPK phosphatase

B trdu: iter (nrpl/grfl/cytl/horl), csrc (lgic, enzr, gprc, igsr, intg, nrpr/grfr/cytr), itra (adap, gbpr, mapk), calc, lipd; path (hedp, wntp, tgfp+mapp, notp, jakp, fsap, hipp, tlrp)

Transferases: phosphorus-containing groups (EC 2.7)

2.7.1-2.7.4:
phosphotransferase/kinase
(PO₄)

2.7.1: OH acceptor	Hexo- · Gluco- · Fructo- (Hepatic) · Galacto- · Phosphofructo- (1, Liver, Muscle, Platelet, 2) · Riboflavin · Shikimate · Thymidine (ADP-thymidine) · NAD⁺ · Glycerol · Pantothenate · Mevalonate · Pyruvate · Deoxycytidine · PFP · Diacylglycerol · Phosphoinositide 3 (Class I PI 3, Class II PI 3) · Sphingosine · Glucose-1,6-bisphosphate synthase

2.7.2: COOH acceptor	Phosphoglycerate · Aspartate

2.7.3: N acceptor	Creatine

2.7.4: PO₄ acceptor	Phosphomevalonate · Adenylate · Nucleoside-diphosphate · Uridylate · Guanylate · Thiamine-diphosphate

2.7.6: diphosphotransferase
(P₂O₇)

Ribose-phosphate diphosphokinase · Thiamine diphosphokinase

2.7.7: nucleotidyltransferase
(PO₄-nucleoside)

Polymerase

DNA polymerase	DNA-directed DNA polymerase: DNA polymerase I · DNA polymerase II · DNA polymerase III holoenzyme RNA-directed DNA polymerase: Reverse transcriptase (Telomerase) DNA nucleotidylexotransferase/Terminal deoxynucleotidyl transferase

RNA nucleotidyltransferase	RNA polymerase/DNA-directed RNA polymerase: RNA polymerase I · RNA polymerase II · RNA polymerase III · RNA polymerase IV · Primase · RNA-dependent RNA polymerase PNPase

Phosphorolytic
3' to 5' exoribonuclease

RNase PH · PNPase

Uridylyltransferase

Glucose-1-phosphate uridylyltransferase · Galactose-1-phosphate uridylyltransferase

Guanylyltransferase

mRNA capping enzyme

Other

Recombinase (Integrase) · Transposase

2.7.8: miscellaneous

Phosphatidyltransferases	CDP-diacylglycerol—glycerol-3-phosphate 3-phosphatidyltransferase · CDP-diacylglycerol—serine O-phosphatidyltransferase · CDP-diacylglycerol—inositol 3-phosphatidyltransferase · CDP-diacylglycerol—choline O-phosphatidyltransferase

Glycosyl-1-phosphotransferase	N-acetylglucosamine-1-phosphate transferase

2.7.10-2.7.13: protein kinase
(PO₄; protein acceptor)

2.7.10: protein-tyrosine	see tyrosine kinases

2.7.11: protein-serine/threonine	see serine/threonine-specific protein kinases

2.7.12: protein-dual-specificity	see serine/threonine-specific protein kinases

2.7.13: protein-histidine	Protein-histidine pros-kinase · Protein-histidine tele-kinase · Histidine kinase

B enzm: 1.1/2/3/4/5/6/7/8/10/11/13/14/15-18, 2.1/2/3/4/5/6/7/8, 2.7.10, 2.7.11-12, 3.1/2/3/4/5/6/7, 3.1.3.48, 3.4.21/22/23/24, 4.1/2/3/4/5/6, 5.1/2/3/4/99, 6.1-3/4/5-6

Kinases: Serine/threonine-specific protein kinases (EC 2.7.11-12)

Serine/threonine-specific protein kinases (EC 2.7.11.1-EC 2.7.11.20)

Non-specific serine/threonine protein kinases (EC 2.7.11.1)	LATS1, LATS2, MAST1, MAST2, STK38, STK38L, CIT, ROCK1, SGK, SGK2, SGK3, Protein kinase B (AKT1, AKT2, AKT3), Ataxia telangiectasia mutated, Mammalian target of rapamycin, EIF-2 kinases (PKR, HRI, EIF2AK3, EIF2AK4), Wee1 (WEE1)

Pyruvate dehydrogenase kinase (EC 2.7.11.2)	PDK1, PDK2, PDK3

Dephospho-(reductase kinase) kinase (EC 2.7.11.3)	AMP-activated protein kinase α (PRKAA1, PRKAA2) · β (PRKAB1, PRKAB2) · γ (PRKAG1, PRKAG2, PRKAG3)

(3-methyl-2-oxobutanoate dehydrogenase (acetyl-transferring)) (EC 2.7.11.4)	BCKDK, BCKDHA, BCKDHB

(isocitrate dehydrogenase (NADP+)) kinase (EC 2.7.11.5)	IDH2, IDH3A, IDH3B, IDH3G

(tyrosine 3-monooxygenase) kinase (EC 2.7.11.6)	STK4

Myosin-heavy-chain kinase (EC 2.7.11.7)	Aurora kinase (Aurora A kinase, Aurora B kinase)

Fas-activated serine/threonine kinase (EC 2.7.11.8)	FASTK, STK10

Goodpasture-antigen-binding protein kinase (EC 2.7.11.9)	-

IκB kinase (EC 2.7.11.10)	CHUK, IKK2, TBK1, IKBKE, IKBKG, IKBKAP

cAMP-dependent protein kinase (EC 2.7.11.11)	Protein kinase A, PRKACG, PRKACB, PRKACA, PRKY

cGMP-dependent protein kinase (EC 2.7.11.12)	Protein kinase G, PRKG1

Protein kinase C (EC 2.7.11.13)	Protein kinase C, Protein kinase Cζ, PKC alpha, PRKCB1, PRKCD, PRKCE, PRKCH, PRKCG, PRKCI, PRKCQ, Protein kinase N1, PKN2, PKN3,

Rhodopsin kinase (EC 2.7.11.14)	Rhodopsin kinase

Beta adrenergic receptor kinase (EC 2.7.11.15)	Beta adrenergic receptor kinase, Beta adrenergic receptor kinase-2

G-protein coupled receptor kinases (EC 2.7.11.16)	GRK4, GRK5, GRK6

Ca2+/calmodulin-dependent (EC 2.7.11.17)	BRSK2, CAMK1, CAMK2A, CAMK2B, CAMK2D, CAMK2G, CAMK4, MLCK, CASK, CHEK1, CHEK2, DAPK1, DAPK2, DAPK3, STK11, MAPKAPK2, MAPKAPK3, MAPKAPK5, MARK1, MARK2, MARK3, MARK4, MELK, MKNK1, MKNK2, NUAK1, NUAK2, OBSCN, PASK, PHKG1, PHKG2, PIM1, PIM2, PKD1, PRKD2, PRKD3, PSKH1, SNF1LK2, KIAA0999, STK40, SNF1LK, SNRK, SPEG, TSSK2, Kalirin, TRIB1, TRIB2, TRIB3, TRIO, Titin, DCLK1

Myosin light-chain kinase (EC 2.7.11.18)	MYLK, MYLK2, MYLK3, MYLK4

Phosphorylase kinase (EC 2.7.11.19)	PHKA1, PHKA2, PHKB, PHKG1, PHKG2

Elongation factor 2 kinase (EC 2.7.11.20)	EEF2K, STK19

Serine/threonine-specific protein kinases (EC 2.7.11.21-EC 2.7.11.30)

Polo kinase (EC 2.7.11.21)	PLK1, PLK2, PLK3, PLK4

Cyclin-dependent kinase (EC 2.7.11.22)	CDK1, CDK2, CDKL2, CDK3, CDK4, CDK5, CDKL5, CDK6, CDK7, CDK8, CDK9, CDK10, CDC2L5, CRKRS, PCTK1, PCTK2, PCTK3, PFTK1, CDC2L1

(RNA-polymerase)-subunit kinase (EC 2.7.11.23)	RPS6KA5, RPS6KA4, P70S6 kinase, P70-S6 Kinase 1, RPS6KB2, RPS6KA2, RPS6KA3, RPS6KA1, RPS6KC1

Mitogen-activated protein kinase (EC 2.7.11.24)	Extracellular signal-regulated (MAPK1, MAPK3, MAPK4, MAPK6, MAPK7, MAPK12, MAPK15), C-Jun N-terminal (MAPK8, MAPK9, MAPK10), P38 mitogen-activated protein (MAPK11, MAPK13, MAPK14)

MAP3K (EC 2.7.11.25)	MAP kinase kinase kinases (MAP3K1, MAP3K2, MAP3K3, MAP3K4, MAP3K5, MAP3K6, MAP3K7, MAP3K8) RAFs (ARAF, BRAF, KSR1, KSR2), MLKs (MAP3K12, MAP3K13, MAP3K9, MAP3K10, MAP3K11, MAP3K7, ZAK), CDC7, MAP3K14

Tau-protein kinase (EC 2.7.11.26)	TPK1, TTK, GSK-3

(acetyl-CoA carboxylase) kinase (EC 2.7.11.27)	-

Tropomyosin kinase (EC 2.7.11.28)	-

Low-density-lipoprotein receptor kinase (EC 2.7.11.29)	-

Receptor protein serine/threonine kinase (EC 2.7.11.30)	Bone morphogenetic protein receptors (BMPR1, BMPR1A, BMPR1B, BMPR2), ACVR1, ACVR1B, ACVR1C, ACVR2A, ACVR2B, ACVRL1, Anti-Müllerian hormone receptor

Dual-specificity kinases (EC 2.7.12)

MAP2K	MAP2K1, MAP2K2, MAP2K3, MAP2K4, MAP2K5, MAP2K6, MAP2K7

B enzm: 1.1/2/3/4/5/6/7/8/10/11/13/14/15-18, 2.1/2/3/4/5/6/7/8, 2.7.10, 2.7.11-12, 3.1/2/3/4/5/6/7, 3.1.3.48, 3.4.21/22/23/24, 4.1/2/3/4/5/6, 5.1/2/3/4/99, 6.1-3/4/5-6