Molecular cloning and expression of cDNA for human antileukoprotease from cervix uterus. 
We have isolated cDNA clones for the human antileukoprotease HUSI-I, an elastase inhibitor, from a library, containing cDNA inserts made from human cervix uterus.  A library of 10 000 recombinants was screened using a mixture of 16 different oligodeoxyribonucleotides which correspond to amino acids 79-84 and one 20mer oligodeoxyribonucleotide corresponding to amino acids 19-26.  Two overlapping cDNA clones, containing the entire coding sequence and part of the 5'- and 3'-untranslated region, were isolated.  DNA sequence data showed that our clone corresponds with the available protein sequence data.  For expression, the cDNA fragment was inserted in a derivative of plasmid pPLc236 and expressed under the control of lambda PL promoter.  Expression of antileukoprotease was proven by Western blot analysis and inhibition of chymotrypsin.