Function
Fatty acid desaturase that introduces a cis double bond at the 4-position in 22-carbon polyunsaturated fatty acids that contain a Delta(7) double bond, resulting in the production of delta-4 desaturated fatty acid docosahexanoic acid (DHA) (22:6(4,7,10,13,16,19)).
Sequence
MTVGYDEEIPFEQVRAHNKPDDAWCAIHGHVYDVTKFASVHPGGDIILLAAGKEATVLYETYHVRGVSDAVLRKYRIGKLPDGQGGANEKEKRTLSGLSSASYYTWNSDFYRVMRERVVARLKERGKARRGGYELWIKAFLLLVGFWSSLYWMCTLDPSFGAILAAMSLGVFAAFVGTCIQHDGNHGAFAQSRWVNKVAGWTLDMIGASGMTWEFQHVLGHHPYTNLIEEENGLQKVSGKKMDTKLADQESDPDVFSTYPMMRLHPWHQKRWYHRFQHIYGPFIFGFMTINKVVTQDVGVVLRKRLFQIDAECRYASPMYVARFWIMKALTVLYMVALPCYMQGPWHGLKLFAIAHFTCGEVLATMFIVNHIIEGVSYASKDAVKGTMAPPKTMHGVTPMNNTRKEVEAEASKSGAVVKSVPLDDWAVVQCQTSVNWSVGSWFWNHFSGGLNHQIEHHLFPGLSHETYYHIQDVFQSTCAEYGVPYQHEPSLWTAYWKMLEHLRQLGNEETHESWQRAA