[No authors listed]
Mammalian-secreted phospholipases A(2) (sPLA(2)) form a diverse family of at least nine enzymes that hydrolyze phospholipids to release free fatty acids and lysophospholipids. We report here the cloning and characterization of human group IIF sPLA(2) (hGIIF sPLA(2)). The full-length cDNA codes for a signal peptide of 20 amino acid followed by a mature protein of 148 amino acids containing all of the structural features of catalytically active group II sPLA(2)s. hGIIF sPLA(2) gene is located on chromosome 1 and lies within a sPLA(2) gene cluster of about 300 kbp that also contains the genes for group IIA, IIC, IID, IIE, and V sPLA(2)s. In adult tissues, hGIIF is highly expressed in placenta, testis, thymus, liver, and kidney. Finally, recombinant expression of hGIIF sPLA(2) in Escherichia coli shows that the enzyme is Ca(2+)-dependent, maximally active at pH 7-8, and hydrolyzes phosphatidylglycerol versus phosphatidylcholine with a 15-fold preference.
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