title: Potato cysteine proteinase inhibitor gene family: molecular cloning, characterisation and immunocytochemical localisation studies.
abstract: Potato cysteine proteinase inhibitors (PCPIs) represent a distinct group of proteins as they show no homology to any other known cysteine proteinase inhibitor superfamilies, but they all belong to the Kunitz-type soybean trypsin inhibitor family. cDNA clones for five PCPIs have been isolated and sequenced. Amino acid substitutions occurring in the limited regions forming loops on the surface of these proteins suggest a further classification of PCPIs into three subgroups. Accumulation of PCPI was observed in vacuoles of stems after treatment with jasmonic acid (JA) using immunocytochemical localisation, implying that these inhibitors are part of a potato defence mechanism against insects and pathogens. Genomic DNA analysis show that PCPIs form a multigene family and suggest that their genes do not possess any introns.
authors.affiliation: Department of Biochemistry and Molecular Biology, Jozef Stefan Institute, Jamova 39, Ljubljana, Slovenia.
authors.forename: K
authors.initials: K
authors.lastname: Gruden
authors.forename: B
authors.initials: B
authors.lastname: Strukelj
authors.forename: M
authors.initials: M
authors.lastname: Ravnikar
authors.forename: M
authors.initials: M
authors.lastname: Poljsak-Prijatelj
authors.forename: I
authors.initials: I
authors.lastname: Mavric
authors.forename: J
authors.initials: J
authors.lastname: Brzin
authors.forename: J
authors.initials: J
authors.lastname: Pungercar
authors.forename: I
authors.initials: I
authors.lastname: Kregar
mesh_terms: D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D015853:Cysteine Proteinase Inhibitors / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D018745:Genome, Plant; D007150:Immunohistochemistry; D007424:Intracellular Fluid / Q000201:enzymology; D008969:Molecular Sequence Data; D005810:Multigene Family; D017422:Sequence Analysis, DNA; D011198:Solanum tuberosum / Q000737:chemistry / Q000201:enzymology* / Q000235:genetics*
chemical_list: D015853:Cysteine Proteinase Inhibitors