title: Identification of a novel human serpin gene; cloning sequencing and expression of leupin.
abstract: A novel serpin gene has been isolated, cloned and sequenced. A PCR amplified fragment of the gene was originally identified from human genomic DNA, and the full-length cDNA was subsequently isolated from HeLa cells and sequenced. The novel serpin is very high in protein sequence similarity (91.8%) to the squamous cell carcinoma antigen (SCCA), but contains substantial differences in the reactive site loop sequence, including a different amino acid (leucine) in the P1 position. The gene product, named leupin, is expressed in HeLa cells, SKGIIIa cells and human placenta. The protein has a predicted M(r) of 44,857 and an isoelectric point of 6.04 which is consistent with the more acidic form of SCCA associated with squamous cell carcinomas.
authors.affiliation: Department of Biochemistry, University College Dublin, Ireland.
authors.forename: R C
authors.initials: RC
authors.lastname: Barnes
authors.forename: D M
authors.initials: DM
authors.lastname: Worrall
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers; D015870:Gene Expression; D006367:HeLa Cells; D015186:Hominidae / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D015843:Serpins / Q000096:biosynthesis* / Q000235:genetics*
chemical_list: D017931:DNA Primers; D015843:Serpins; C096216:leupin