Arachidonate 5-lipoxygenase - P09917 (LOX5_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

 
Function
Catalyzes the oxygenation of arachidonic acid to 5-hydroperoxyicosatetraenoic acid (5-HPETE) followed by the dehydration of the hydroperoxide into an epoxide, 5,6- oxidoicosatetraenoic acid (LTA4), thereby participates in the first step in leukotriene biosynthesis and in the inflammatory processes (PubMed:8631361, PubMed:21233389, PubMed:22516296, PubMed:24282679, PubMed:19022417, PubMed:23246375, PubMed:8615788, PubMed:24893149, PubMed:31664810). Also catalyzes the oxygenation of arachidonic acid into 8-hydroperoxyicosatetraenoic acid (8-HPETE) and 12-hydroperoxyicosatetraenoic acid (12-HPETE) (PubMed:23246375). Although arachidonic acid is the preferred substrate, can also metabolize oxidized fatty acids derived from arachidonic acid such as (15S)-HETE, eicosapentaenoic acid (EPA) such as (18R)- and (18S)-HEPE or docosahexaenoic (DHA) acid which leads to the formation of specialized pro-resolving mediators (SPM) lipoxin and resolvins E and D respectively, therefore plays a role in anti-inflammatory response (PubMed:21206090, PubMed:31664810, PubMed:8615788, PubMed:17114001). Also displays lipoxin synthase activity being able to convert (15S)-HETE into a conjugate tetraene (PubMed:31664810). Oxidation of docosahexaenoic acid directly inhibits endothelial cell proliferation and sprouting angiogenesis via peroxisome proliferator-activated receptor gamma (PPARgamma) (By similarity). Does not catalyze the oxygenation of linoleic acid and does not convert (5S)-HETE to lipoxins isomers (PubMed:31664810). In addition to inflammatory processes, participates in dendritic cell migration, wound healing through an antioxidant mechanism based on HO1 regulation expression, monocyte adhesion to the endothelium via ITGAM expression on monocytes (By similarity). Moreover, establishes an adaptive humoral immunity by regulating primary resting B cells and follicular helper T cells and participates in the CD40-induced production of reactive oxygen species (ROS) after CD40 ligation in B cells through interaction with PIK3R1 that bridges ALOX5 with CD40 (PubMed:21200133). Also may play a role in glucose homeostasis, regulation of INS secretion and palmitic acid-induced insulin resistance via AMPK (By similarity). Can regulate bone mineralization and fat cell differentiation increases in induced pluripotent stem cells (By similarity). UniProt
Catalytic Activity
4Z,7Z,10Z,13Z,16Z,19Z-docosahexaenoate + O2 = 7-hydroperoxy-4Z,8E,10Z,13Z,16Z,19Z-docosahexaenoate UniProt
Pathway Maps
Maps:       
Reactions:
      ESCHER  BiGG
Subunit Structure
Homodimer (PubMed:22516296, PubMed:21233389). Interacts with ALOX5AP and LTC4S (PubMed:19233132). Interacts with COTL1, the interaction is required for stability and efficient catalytic activity (PubMed:19807693). Interacts with PIK3R1; this interaction bridges ALOX5 with CD40 after CD40 ligation in B cells and leads to the production of reactive oxygen species (ROS) (PubMed:21200133). Interacts (via PLAT domain) with DICER1 (via Dicer dsRNA-binding fold domain); this interaction enhances arachidonate 5-lipoxygenase activity and modifies the miRNA precursor processing activity of DICER1 (PubMed:19022417). UniProt
Legend
The Protein Feature View requires a browser that supports SVG (Scalable Vector Graphics). Mouse over tracks and labels for more information.
Data origin/color codes
The vertical color bar on the left side indicates data provenance.
Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
Sequence Mismatches It is now possible to see information about expression tags, cloning artifacts, and many other details related to sequence mismatches.
Icons represent a number of different sequence modifications that can be observed in PDB files. For example the 'T' icon T represents expression tags that have been added to the sequence. The 'E' icon E represents an engineered mutation. However, besides these two, there are many other icons. For more information about the meaning and exact position of a sequence modification, move the cursor over the icon.
Validation Track

For more details on the Validation Track (Structure Summary Page only) see the dedicated help page.

Data in red indicates combined ranges of Homology Models from the SWISS-MODEL Repository  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
Organism icons generated by flaticon.com under CC BY. The authors are: Freepik, Icons8, OCHA, Scott de Jonge.

For more details on the Protein Feature view see the dedicated help page.