Center for Bioinformatics
Oxidoreductases | Transferases | Hydrolases | Lyases | Isomerases | Ligases

Basic Information

Enzyme Number

Official Name

arachidonate 5-lipoxygenase

Name from literature

oxygen oxidoreductase

Pathway from literature

leukotriene synthesis/first step in the pathway,but the conversion of LTA4 to LTB4

Pathway from KEGG

Lipid Metabolism; Linoleic acid metabolism; map00591

Lipid Metabolism; Arachidonic acid metabolism; map00590


Human (9606)

Genome localization

10q11.2[240 ],

Rate-limiting Description

"5-lipoxygenase (5-LO) is the rate-limiting enzyme in the synthetic pathway for cysteinyl leukotrienes (CysLTs), bronchoconstricting agents that are overproduced in asthma." (16415251)

"These results were explained after a comparison of the rates of synthesis of these 5-lipoxygenase metabolites in the presence and absence of added arachidonic acid which led to the conclusion that leukotriene A hydrolase, the enzyme catalysing the formation of LTB4, was saturated with substrate and rate-limiting for LTB4 synthesis during A23187 stimulation." (1311589)

"Therefore, the present study determined the abundance of the mRNA for arachidonate 5-lipoxygenase (5-LO; arachidonate:oxygen 5-oxidoreductase, EC, which is the rate-limiting enzyme in leukotriene synthesis, in a series of human brain tumors." (1357659)

Regulatory Information

Upstream transcription factor


Regulatory type


key enzyme;

"We now demonstrate that celecoxib inhibits 5-lipoxygenase (5-LO), a key enzyme in leukotriene (LT) biosynthesis." (18692027)

phosphorylation;MAPK-activated protein kinase 2

"promotion of phosphorylation at Ser-271 by MAPK-activated protein kinase 2 and arachidonic acid" (11844797)


"PKA phosphorylates 5-LO on Ser-523, which inhibits the catalytic activity of 5-LO and reduces cellular LT generation" (15280375)

transcriptional factor;Sp1(6667)

"the GC-rich part of the 5-lipoxygenase gene promoter, including a novel Sp1 site, appear important for basal (rather than upregulated) transcription of 5-lipoxygenase gene in monocytic cells" (16413224)

transcriptional factor;TGFbeta(7040)

"Sequence analysis and deletion studies indicate the existence of up to four Smad binding elements and at least one TGFbeta responsive element far downstream of the transcriptional start site of the 5-lipoxygenase gene." (16919603)


"ANXA7 and p53 can distinctly regulate LOX transcription that is potentially relevant to the arachidonic acid -mediated cell growth control in tumor suppression." (17018618)




P09917:from_uniprot:272_Phosphoserine; by MAPKAPK2


P09917:from_uniprot:524_Phosphoserine; by PKA

Gene ontology

Gene ontology

GO:0016165 (F) lipoxygenase activity [P09917 ];
GO:0016020 (C) membrane [P09917 ];
GO:0004051 (F) arachidonate 5-lipoxygenase activity [P09917 ];
GO:0019370 (P) leukotriene biosynthetic process [P09917 ];
GO:0005737 (C) cytoplasm [P09917 ];
GO:0005506 (F) iron ion binding [P09917 ];
GO:0005509 (F) calcium ion binding [P09917 ];
GO:0055114 (P) oxidation reduction [P09917 ];
GO:0005515 (F) protein binding [P09917 ];

Subcellular localization


cell membrane [P09917 ];

cytoplasm [P09917 ];




Entrez Gene




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  Last Modified: 2009-03-24  
  Design by Zhao Min