Abstract
5-Lipoxygenase (EC 1.13.11.34), a Ca2+-and ATP-requiring enzyme, catalyzes the first two steps in the biosynthesis of the peptidoleukotrienes and the chemotactic factor leukotriene B4. A cDNA clone corresponding to 5-lipoxygenase was isolated from a human lung lambda gt11 expression library by immunoscreening with a polyclonal antibody. Additional clones from a human placenta lambda gt11 cDNA library were obtained by plaque hybridization with the 32P-labeled lung cDNA clone. Sequence data obtained from several overlapping clones indicate that the composite cDNAs contain the complete coding region for the enzyme. From the deduced primary structure, 5-lipoxygenase encodes a 673 amino acid protein with a calculated molecular weight of 77,839. Direct analysis of the native protein and its proteolytic fragments confirmed the deduced composition, the amino-terminal amino acid sequence, and the structure of many internal segments. 5-Lipoxygenase has no apparent sequence homology with leukotriene A4 hydrolase or Ca2+ -binding proteins. RNA blot analysis indicated substantial amounts of an mRNA species of approximately equal to 2700 nucleotides in leukocytes, lung, and placenta.
MeSH Terms
Amino Acid Sequence
Amino Acids/analysis
Arachidonate 5-Lipoxygenase/genetics
Arachidonate Lipoxygenases/genetics
Base Sequence
Cloning, Molecular
DNA/genetics
DNA Restriction Enzymes
Female
Genes
Humans
Lung/enzymology
Molecular Sequence Data
Nucleotide Mapping
Placenta/enzymology
RNA, Messenger/genetics
Chemicals
Amino Acids
RNA, Messenger
DNA
Arachidonate Lipoxygenases
Arachidonate 5-Lipoxygenase
DNA Restriction Enzymes
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Matsumoto T
Department of Physiological Chemistry, Karolinska Institutet, Stockholm, Sweden.
Funk C D
Rådmark O
Höög J O
Jörnvall H
Samuelsson B
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