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NRD convertase (N-arginine dibasic convertase, NRD-C) is a dibasic selective metalloprotease which cleaves on the N-terminal side of an arginine residue in a dibasic pair. Abundant in endocrine tissues, the highest levels are found in testis. The mechanism whereby NRD-C expression is regulated at the transcriptional level has been examined by reporter-gene assay and electrophoretic-mobility-shift assays. Analysis of the rat and human promoters show that they are highly conserved, containing a number of motifs which may correspond to transcription-factor binding sites. The rat promoter has been cloned into a luciferase reporter vector and analysed in a number of cell lines. Full functionality of the promoter is observed with 5' deletions to 411 bp upstream of the transcriptional start site in spermatid, prostate and pituitary cell lines. Further deletion to 101 bp causes a complete loss of activity in spermatid and prostate lines. By contrast, GH3 pituitary cells display no reduction in promoter activity with deletion to 101 bp of upstream sequence. A number of transcription-factor binding sites have been identified by electrophoretic-mobility-shift assays in the region 411-101; however, no differences in binding between the cell lines were observed.

biochemical journal

Gene expression of the dibasic-pair cleaving enzyme NRD convertase (N-arginine dibasic convertase) is differentially regulated in the GH3 pituitary and Mat-Lu prostate cell lines