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국내산 콩 품종 3종과 미국산 콩 2종(non-GMO 및 GMO glyphosate-tolerant HS2906)에 대하여 단백질함량과 분포의 차이를 아미노산 분석, 총 질소량, PAGE/densitometry법에 의해 분석하였다. 아미노산 구성과 총 질소량에서 품종간 유의적인 차이는 없었다. 한편 단백질 추출에서 SDS/buffer 추출법이 더 효과적이었다. 총 단백질함량(380.2∼423.9 mg/g)과 단백질 분포는 품종간 유사하였으나, 상세 PAGE(12.5% normal gel) 결과 재래종 콩(WS82)에 비해 제초제 저항성 GMO콩(HS2906)에서 beta conglycinin(55 kDa) 양이 낮게 나타났으며, 25 kDa 단백질의 경우 미국산 콩에서는 관찰되지 못한 반면에 국내산 콩 품종에서는 뚜렷하게 관찰되었으며, -conglycinin은 미국산 제초제 저항성 GMO콩과 국내산 황금콩에서 상대적으로 낮은 것으로 관찰되었다. 이와 같은 결과는 normal PAGE/densitometry 분석법은 콩시료 분석에 유용하게 활용될 수 있음을 보여주었다.


In order to elucidate the differences of protein profiles among soybean cultivars, the protein composition of three conventional domestic soybean cultivars and two imported ones including glyphosate tolerant HS2906 was analyzed by total nitrogen measurement, amino acid analysis and PAGE/densitometry. There were no statistically significant differences in the levels of any amino acid, including aromatic amino acids, between glyphosate tolerant soybean and the conventional soybean WS82. In the extraction of protein, the SDS/buffer system was more efficient than the defatting/water system. The SDS PAGE/densitometry analysis showed that there was a similar profile of proteins among cultivars, although the amount of total protein ranged from 380.2 mg/g to 423.9 mg/g. In addition, there was no discernable difference of protein profile between glyphosate tolerant soybean (total protein amount, 380.2 mg/g) and the conventional soybean WS82 (390.2 mg/g), although the amount of conglycinin (55 kDa) was lower in glyphosate tolerant soybean. Meanwhile, the amount of 25 kDa protein was greater in domestic soybean cultivars than imported ones. Thus, normal PAGE/ densitometry method would be useful to analyze the difference in protein profiles of soybean proteins, and furthermore evaluate the protein profile of proteins between GMO and conventional soybean.