Inositol-hexakisphosphate kinase

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Inositol-hexakisphosphate kinase (EC 2.7.4.21, ATP:1D-myo-inositol-hexakisphosphate phosphotransferase) is an enzyme with systematic name ATP:1D-myo-inositol-hexakisphosphate 5-phosphotransferase.^[1]^[2]^[3] This enzyme catalyses the following chemical reaction

(1) ATP + 1D-myo-inositol hexakisphosphate

\rightleftharpoons

ADP + 1D-myo-inositol 5-diphosphate 1,2,3,4,6-pentakisphosphate

(2) ATP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate

\rightleftharpoons

ADP + 1D-myo-inositol diphosphate tetrakisphosphate (isomeric configuration unknown)

Three mammalian isoforms are known to exist.

References

↑ Saiardi, A.; Erdjument-Bromage, H.; Snowman, A.M.; Tempst, P.; Snyder, S.H. (1999). "Synthesis of diphosphoinositol pentakisphosphate by a newly identified family of higher inositol polyphosphate kinases". Curr. Biol. 9: 1323–1326. doi:10.1016/S0960-9822(00)80055-X. PMID 10574768.
↑ Schell, M.J.; Letcher, A.J.; Brearley, C.A.; Biber, J.; Murer, H.; Irvine, R.F. (1999). "PiUS (P_i uptake stimulator) is an inositol hexakisphosphate kinase". FEBS Lett. 461: 169–172. doi:10.1016/S0014-5793(99)01462-3. PMID 10567691.
↑ Albert, C.; Safrany, S.T.; Bembenek, M.E.; Reddy, K.M.; Reddy, K.K.; Falck, J.-R.; Bröcker, M.; Shears, S.B.; Mayr, G.W. (1997). "Biological variability in the structures of diphosphoinositol polyphosphates in Dictyostelium discoideum and mammalian cells". Biochem. J. 327: 553–560. PMC 1218829. PMID 9359429.

External links

Inositol-hexakisphosphate kinase at the US National Library of Medicine Medical Subject Headings (MeSH)

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 kinase

2.7.3: N acceptor	Creatine

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

2.7.6: diphosphotransferase
(P₂O₇)

2.7.7: nucleotidyltransferase
(PO₄-nucleoside)

Polymerase

DNA polymerase	DNA-directed DNA polymerase I II III IV V 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

Nucleotidyltransferase

Guanylyltransferase

mRNA capping enzyme

Other

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

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)

This article is issued from Wikipedia - version of the 5/21/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.

Inositol-hexakisphosphate kinase

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References

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