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  • Title: Five distinct calcium and phospholipid binding proteins share homology with lipocortin I.
    Author: Pepinsky RB, Tizard R, Mattaliano RJ, Sinclair LK, Miller GT, Browning JL, Chow EP, Burne C, Huang KS, Pratt D.
    Journal: J Biol Chem; 1988 Aug 05; 263(22):10799-811. PubMed ID: 2968983.
    Abstract:
    We have purified two 35-kDa proteins from rat peritoneal lavages that inhibit phospholipase A2 activity. Both are calcium/phospholipid-dependent membrane binding proteins and share similar structural and biochemical properties with lipocortins I and II. By sequence analysis we confirmed that they are lipocortin-related, and we refer to the two inhibitors as lipocortins III and V. Using partial sequence information obtained from the purified rat proteins, full length cDNA clones for both proteins and for their human counterparts were isolated. As with lipocortins I and II, the amino acid sequences of lipocortins III and V which were deduced from the cDNA clones are highly conserved, sharing 50% identity with other family members. Related proteins were also purified from bovine intestinal mucosa and characterized by peptide mapping, sequence, and immunological analyses. In addition to lipocortins III and V the bovine preparation contained a third 35-kDa inhibitor and a 68-kDa inhibitor, extending the number of known lipocortins to six distinct proteins. While the various lipocortins are structurally similar, distinct differences in their cellular distribution indicate specialized roles for the individual proteins.
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