A full-length cDNA clone coding for rat napsin was identified by homology s
earch of the ZooSeq rat EST database (Incyte). Northern blot analysis revea
led high expression of napsin mRNA transcripts in kidney, lung and spleen.
Western blot analysis showed that rat napsin is expressed in kidney as a 50
-kDa, highly glycosylated, monomeric protein. Lysates prepared from human e
mbryonic kidney cells (HEK293) transfected with rat napsin showed increased
enzymatic activity which was inhibited by pepstatin. (C) 2000 Elsevier Sci
ence B.V. All rights reserved.