IUBMB Enzyme Nomenclature


Accepted name: polyenoic fatty acid isomerase

Reaction: (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate = (5Z,7E,9E,14Z,17Z)-icosapentaenoate

For diagram click here.

Other name(s): PFI; eicosapentaenoate cis-Δ5,8,11,14,17-eicosapentaenoate cis-Δ5-trans-Δ7,9-cis-Δ14,17 isomerase; (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate Δ8,117,8-isomerase (incorrect); (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate Δ8,117,9-isomerase (trans-double-bond-forming)

Systematic name: (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate Δ8,117,9-isomerase (trans-double-bond-forming)

Comments: The enzyme from the red alga Ptilota filicina catalyses the isomerization of skip dienes (methylene-interrupted double bonds) in a broad range of fatty acids and fatty-acid analogues, such as arachidonate and γ-linolenate, to yield a conjugated triene.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 159002-84-3


1. Wise, M.L., Hamberg, M. and Gerwick, W.H. Biosynthesis of conjugated fatty acids by a novel isomerase from the red marine alga Ptilota filicina. Biochemistry 33 (1994) 15223-15232. [PMID: 7803384]

2. Wise, M.L., Soderstrom, K., Murray, T.F. and Gerwick, W.H. Synthesis and cannabinoid receptor binding activity of conjugated triene anandamide, a novel eicosanoid. Experientia 52 (1996) 88-92. [PMID: 8575565]

3. Wise, M.L., Rossi, J. and Gerwick, W.H. Binding site characterization of polyenoic fatty-acid isomerase from the marine alga Ptilota filicina. Biochemistry 36 (1997) 2985-2992. [PMID: 9062129]

4. Zheng, W., Wise, M.L., Wyrick, A., Metz, J.G., Yuan, L. and Gerwick, W.H.Polyenoic fatty-acid isomerase from the marine red alga Ptilota filicina: protein characterization and functional expression of the cloned cDNA. Arch. Biochem. Biophys. 401 (2002) 11-20. [PMID: 12054482]

[EC created 2004]

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