Acts as a front-end fatty acyl-coenzyme A (CoA) desaturase that introduces a cis double bond at carbon 5 located between a preexisting double bond and the carboxyl end of the fatty acyl chain. Involved in biosynthesis of highly unsaturated fatty acids (HUFA) from the essential polyunsaturated fatty acids (PUFA) linoleic acid (LA) (18:2n-6) and alpha-linolenic acid (ALA) (18:3n-3) precursors. Specifically, desaturates dihomo-gamma-linoleoate (DGLA) (20:3n-6) and eicosatetraenoate (ETA) (20:4n-3) to generate arachidonate (AA) (20:4n-6) and eicosapentaenoate (EPA) (20:5n-3), respectively (Probable). As a rate limiting enzyme for DGLA (20:3n-6) and AA (20:4n-6)-derived eicosanoid biosynthesis, controls the metabolism of inflammatory lipids like prostaglandin E2, critical for efficient acute inflammatory response and maintenance of epithelium homeostasis. Contributes to membrane phospholipid biosynthesis by providing AA (20:4n-6) as a major acyl chain esterified into phospholipids. In particular, regulates phosphatidylinositol-4,5-bisphosphate levels, modulating inflammatory cytokine production in T-cells (PubMed:22534642). Also desaturates (11E)-octadecenoate (trans-vaccenoate)(18:1n-9), a metabolite in the biohydrogenation pathway of LA (18:2n-6) (By similarity).

Belongs to the fatty acid desaturase type 1 family.

447 amino acids

MAPDPVPTPGPASAQLRQTRYFTWEEVAQRSGREKERWLVIDRKVYNISDFSRRHPGGSRVISHYAGQDATDPFVAFHINKGLVRKYMNSLLIGELAPEQPSFEPTKNKALTDEFRELRATVERMGLMKANHLFFLVYLLHILLLDVAAWLTLWIFGTSLVPFILCAVLLSTVQAQAGWLQHDFGHLSVFGTSTWNHLLHHFVIGHLKGAPASWWNHMHFQHHAKPNCFRKDPDINMHPLFFALGKVLPVELGREKKKHMPYNHQHKYFFLIGPPALLPLYFQWYIFYFVVQRKKWVDLAWMLSFYARIFFTYMPLLGLKGFLGLFFIVRFLESNWFVWVTQMNHIPMHIDHDRNVDWVSTQLQATCNVHQSAFNNWFSGHLNFQIEHHLFPTMPRHNYHKVAPLVQSLCAKYGIKYESKPLLTAFADIVYSLKESGQLWLDAYLHQ

52.3 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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