EIF-2 kinase

Regulation of translation initiation via phosphorylation of Ser51 in eIF2's α-subunit.^[1]

eIF-2 is a kinase enzyme that phosphorylates eIF-2.^[2]

There are four forms in mammals:

EIF2AK1: heme-regulated inhibitor kinase (HRI)
EIF2AK2: the double-stranded RNA-dependent kinase (PKR)
EIF2AK3: PEK/PERK
EIF2AK4: GCN2

These are all responsible for the phosphorylation of the alpha subunit of eIF-2 at serine 51, one of the best-characterized mechanisms for down-regulating protein synthesis in eukaryotes in response to various cellular stress response's.

References

↑ Nika J, Rippel S, Hannig EM (January 2001). "Biochemical analysis of the eIF2beta gamma complex reveals a structural function for eIF2alpha in catalyzed nucleotide exchange". J. Biol. Chem. 276 (2): 1051–6. doi:10.1074/jbc.M007398200. PMID 11042214.
↑ eIF-2 Kinase at the US National Library of Medicine Medical Subject Headings (MeSH)

Protein biosynthesis: translation (prokaryotic, eukaryotic)

Proteins

Initiation factor

Prokaryotic

Archaeal

aIF1
aIF2
aIF5
aIF6

Eukaryotic

eIF1	eIF1 EIF1AX AY 1B

eIF2	EIF2S1 EIF2S2 EIF2S3 EIF2B1 EIF2B2 EIF2B3 EIF2B4 EIF2B5 EIF-2 kinase eIF2A eIF2D

eIF3	EIF3A B C D E F G H I J K L M

eIF4	EIF4A2 A3 B E1 E2 E3 G1 G2 G3 H

eIF5	EIF5 EIF5A A2 5B

eIF6	EIF6

Elongation factor

Prokaryotic	EF-Tu EF-Ts EF-G

Archaeal	aEF-1, aEF-2

Eukaryotic	EEF-1 EEF1A1 EEF1A2 EEF1A3 EEF1B1 EEF1B2 EEF1B3 EEF1B4 EEF1D EEF1E1 EEF1G EEF2

Release factor

Ribosomal Proteins

Other concepts

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) kinase (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

Polo kinase (EC 2.7.11.21)	PLK1 PLK2 PLK3 PLK4

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 CDK12 CDC2L5 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

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list)

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