title: Accumulation of PrLeg, a Perilla legumin protein in potato tuber results in enhanced level of sulphur-containing amino acids.
abstract: Potato is the fourth staple food in the world, following rice, wheat, and maize, whereas tubers contain high quality of starch, relatively high amounts of vitamin C and many other important substances. It also contains relatively good quality of protein (about 3 to 6% of the dried weight) and patatin, and 11S globulin is a major storage protein with high level of lysine. However, tuber protein contains relatively low amounts of sulphur-containing amino acids, which may result in low nutritional value. Recently, we cloned a gene encoding PrLeg polypeptide, a seed storage protein from Perilla, which contains relatively higher levels of sulphur-containing amino acids. We transformed PrLeg cDNA into a potato plant to over-express under the direction of the tuber-specific promoter, patatin. Most of the transgenic lines identified through PCR and RT-PCR analyses were able to accumulate high amount of prLeg transcript in their tuber tissue, while very little or no transcript that were detected in their leaf tissues. The level of methionine content was elevated up to three-fold compared to non-transgenic parental line, without any significant changes in other amino acids, suggesting that further research is required to get a deeper insight into their nutritional value.
authors.affiliation: Sancheong Oriental Medicinal Herb Institute, Sancheong, Gyeongnam Province, South Korea.
authors.forename: Young-Min
authors.initials: YM
authors.lastname: Goo
authors.forename: Tae-Won
authors.initials: TW
authors.lastname: Kim
authors.forename: Min-Kyung
authors.initials: MK
authors.lastname: Lee
authors.forename: Shin-Woo
authors.initials: SW
authors.lastname: Lee
mesh_terms: D000596:Amino Acids / Q000032:analysis; D002265:Carboxylic Ester Hydrolases / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics; D018506:Gene Expression Regulation, Plant; D024861:Genetic Enhancement; D008715:Methionine / Q000032:analysis / Q000378:metabolism*; D031344:Perilla frutescens / Q000235:genetics*; D018515:Plant Leaves / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D035281:Plant Tubers / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000096:biosynthesis; D018749:RNA, Plant / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D011198:Solanum tuberosum / Q000235:genetics / Q000378:metabolism*; D019076:Transgenes; D000097793:Legumins
chemical_list: D000596:Amino Acids; D002265:Carboxylic Ester Hydrolases; D018076:DNA, Complementary; D008715:Methionine; D010940:Plant Proteins; D012333:RNA, Messenger; D018749:RNA, Plant; D000097793:Legumins; C043222:patatin protein, Solanum tuberosum
keywords: 11s legumin-like seed storage protein of perilla; 2s albumin protein of Brazil nut; BN2S; MS; Methionine; Murashige and Skoog media; PPT; Patatin; Perilla; Phosphinothricin; Potato; PrLeg; SSA; Sulphur-containing amino acid; Sunflower seed albumin; WHO; World Health Organization