ID KHK_HUMAN STANDARD; PRT; 298 AA. AC P50053; Q99532; DT 01-OCT-1996 (Rel. 34, Created) DT 01-OCT-1996 (Rel. 34, Last sequence update) DT 01-OCT-2000 (Rel. 40, Last annotation update) DE KETOHEXOKINASE (EC 2.7.1.3) (HEPATIC FRUCTOKINASE). GN KHK. OS Homo sapiens (Human). OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; OC Mammalia; Eutheria; Primates; Catarrhini; Hominidae; Homo. OX NCBI_TaxID=9606; RN [1] RP SEQUENCE FROM N.A. RX MEDLINE=95135420; PubMed=7833921; RA Bonthron D.T., Brady N., Donaldson I.A., Steinmann B.; RT "Molecular basis of essential fructosuria: molecular cloning and RT mutational analysis of human ketohexokinase (fructokinase)."; RL Hum. Mol. Genet. 3:1627-1631(1994). RN [2] RP SEQUENCE OF 1-26; 71-114 AND 189-298 FROM N.A. RX MEDLINE=99013450; PubMed=9799106; RA Hayward B.E., Bonthron D.T.; RT "Structure and alternative splicing of the ketohexokinase gene."; RL Eur. J. Biochem. 257:85-91(1998). CC -!- CATALYTIC ACTIVITY: ATP + D-FRUCTOSE = ADP + D-FRUCTOSE CC 1-PHOSPHATE. CC -!- ENZYME REGULATION: REQUIRES POTASSIUM. INHIBITION BY ADP. CC -!- PATHWAY: PRIMARY METABOLISM OF DIETARY FRUCTOSE IN MAMMALS. CC -!- SUBUNIT: DIMER OF A-A, A-C OR C-C (PROBABLE). CC -!- ALTERNATIVE PRODUCTS: 2 ISOFORMS; A (SHOWN HERE) AND C; ARE CC PRODUCED BY ALTERNATIVE SPLICING. CC -!- TISSUE SPECIFICITY: MOST ABUNDANT IN LIVER, KIDNEY, GUT, SPLEEN CC AND PANCREAS. LOW LEVELS ALSO FOUND IN ADRENAL, MUSCLE, BRAIN AND CC EYE. CC -!- DISEASE: DEFECTS IN KHK ARE THE CAUSE OF FRUCTOSURIA, A BENIGN CC DEFECT OF INTERMEDIARY METABOLISM. CC -!- SIMILARITY: BELONGS TO THE PFKB FAMILY OF CARBOHYDRATE KINASES. CC -!- CAUTION: FORM C HAS NOT YET BEEN FULLY SEQUENCED IN ITS N-TERMINAL CC (FROM 1-69). CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; X78678; CAA55347.1; -. DR EMBL; X78677; CAA55346.1; -. DR EMBL; Y09336; CAA70516.1; -. DR EMBL; Y09341; CAA70522.1; -. DR EMBL; Y09341; CAA70523.1; -. DR EMBL; Y09340; CAA70521.1; -. DR MIM; 229800; -. DR InterPro; IPR002173; PfkB. DR Pfam; PF00294; pfkB; 1. DR PROSITE; PS00583; PFKB_KINASES_1; FALSE_NEG. DR PROSITE; PS00584; PFKB_KINASES_2; FALSE_NEG. KW Transferase; Kinase; Alternative splicing; Disease mutation; KW Polymorphism. FT VARSPLIC 72 115 VLDDLRRYSVDLRYTVFQTTGSVPIATVIINEASGSRTILY FT YDR -> LVADFRRRGVDVSQVAWQSKGDTPSSCCIINNSN FT GNRTIVLHDT (IN ISOFORM C). FT VARIANT 40 40 G -> R (IN FRUCTOSURIA). FT /FTId=VAR_006072. FT VARIANT 43 43 A -> T (IN FRUCTOSURIA). FT /FTId=VAR_006073. FT VARIANT 49 49 V -> I. FT /FTId=VAR_006074. FT VARIANT 159 159 R -> G (EITHER A POLYMORPHISM OR A FT CLONING ARTIFACT). FT /FTId=VAR_006075. SQ SEQUENCE 298 AA; 32730 MW; 1BA47BDC60C1B89F CRC64; MEEKQILCVG LVVLDVISLV DKYPKEDSEI RCLSQRWQRG GNASNSCTVL SLLGAPCAFM GSMAPGHVAD FVLDDLRRYS VDLRYTVFQT TGSVPIATVI INEASGSRTI LYYDRSLPDV SATDFEKVDL TQFKWIHIEG RNASEQVKML QRIDAHNTRQ PPEQKIRVSV EVEKPREELF QLFGYGDVVF VSKDVAKHLG FQSAEEALRG LYGRVRKGAV LVCAWAEEGA DALGPDGKLL HSDAFPPPRV VDTLGAGDTF NASVIFSLSQ GRSVQEALRF GCQVAGKKCG LQGFDGIV //