Sorghum seed is traditionally used as secondary food sources in addition to rice in Korea. While the hypoglycemia regulating phytochemicals have been found in sorghum seed, peptides related with hypoglycemia never been studied before. To obtain the peptide characteristics and the specifically high-expressed peptides in hypoglycemic sorghum seed, peptide profiles of seven hypoglycemic and five nonhypoglycemic sorghum lines bred in RDA were determined using surface-enhanced laser desorption/ionization time-offlight mass spectrometry (SELDI-TOF MS). The twelve sorghum lines exhibited 104 peptides on CM10 protein chip array (weak cation exchange) and 95 peptides on Q10 (weak cation exchange) in the molecular mass range from 2,000 to 20,000 Da. Heat map via supervised hierarchical clustering of the significantly different peptides (p < 0.01) in peak intensity among the 12 lines effectively revealed the specifically upregulated peptides in each line and distinguished between 7 hypoglycemic and 5 non-hypoglycemic lines. Through the comparison with hypoglycemic and non-hypoglycemic lines, 10 peptides including 2231.6, 2845.4, 2907.9, 3063.5, 3132.6, 3520.8, 4078.8, 5066.2, 5296.5, 5375.5 Da were specifically high-expressed in hypoglycemic lines at p < 0.00001. This study characterized seed peptides of 12 sorghums and found ten peptides highly expressed for hypoglycemic sorghum lines, which could be used as peptide biomarkers for identification of hypoglycemic sorghum.

ABSTRACT
 재료 및 방법
  시료 및 측정장비
  단백질 추출 및 단백질 정량
  수수종자 펩타이드 프로파일링
  Data 선택
  통계분석
 결과 및 고찰
  수수 종자의 펩타이드 프로파일링
  수수 종자의 펩타이드를 이용한 계통식별
  혈당 강하 수수 종자의 특이적 발현 펩타이드 분석
 적 요
 사 사
 인용문헌(REFERENCES)

• 박세준( 국립한경대학교 식물생태화학연구소 ) | Sei Joon Park ( Institute of Ecological Phytochemistry, Hankyong National University, Ansung 456-749, Korea. )
• 황수민( 국립한경대학교 식물생명환경과학과 ) | Su Min Hwang ( Department of Plant Life and Environmental Science, Hankyong National University, Ansung 456-749, Korea. )
• 박준영( 국립한경대학교 식물생태화학연구소 ) | Jun Young Park ( Institute of Ecological Phytochemistry, Hankyong National University, Ansung 456-749, Korea. )
• 고지연( 농촌진흥청 국립식량과학원 기능성작물부 ) | Jee-Yeon Ko ( Department of Functional Crop, NICS, RDA, Milyang, 627-803, Korea )
• 김태완( 국립한경대학교 식물생명환경과학과 ) | Tae Wan Kim ( Department of Plant Life and Environmental Science, Hankyong National University, Ansung 456-749, Korea. ) Corresponding author