Molecular Cloning of Complementary DNA for Human Medullasin: An Inflammatory Serine Protease in Bone Marrow Cells

Abstract
Medullasin, an inflammatory serine protease in bone marrow cells, modifies the functions of natural killer cells, monocytes, and granulocytes. We have cloned a medullasin cDNA from a human acute promyelocytic cell (ML3) cDNA library using oligonucleotide probes synthesized from the information of N-terminal amino acid sequence of natural medullasin. The cDNA contained a long open reading frame encoding 237 amino acid residues beginning from the second amino acid of natural medullasin. The deduced amino acid sequence of medullasin shows a typical serine protease structure, with 41% homology with pig elastase 1.