Comparative Studies of Digestive Fluid Protein of Silkworm Bombyx mori, Larvae reared on Mulberry Leaves and Artificial Diets

상엽육잠과 인공사료육잠의 소화액단백질의 비교연구 - 소화액 RFP를 중심으로 -

This study has been carried out to acquire some basic informations on the digestive fluid of Silkworm, Bombyx mori for developing artficial diets. Silkworms reared on mulberry leaves and artificial diet, were used in this experiments. The results obtained are as follows ; 1. The Red Fluorescent protein was precipitated in 50% acetone solution and did not dissolved in n-butanol solution, but dissolved in methanol solution. 2. Electrophoretic analysis results of mulberry leaves rearing B. mori and artificial diet rearing B. mori, which has been treated with 50% acetone solution were as follows. i) There was distinct difference at the position of high mobility ii) Red Fluorescence was observed only at the position of first band of mulberry leaves rearing B. mori. iii) No different was shown in the electrophoretic patterns of mulberry leaves rearing B. mori on 5th instar 1st-3rd day, but some difference on 5th instar 4th, 5th day. 3. The RFP is the basic protein which has PI 8-9 according to the isoelectric electrophhoresis. 4. The SDS-polyacrylamide gel electrophoresis analysis showed that the molecular weight of RFP was 27,000. 5. The Sephadex G-75 chromatographic analysis showed that there was three peaks between number 16 and 28 in the mulberry leaves rearing B. mori chromatogram, but two peaks between number 18 and 31 in the artifical diet rearing B. mori chromatogram.

인공사료개발연구의 일환으로 상육잠과 인공사료육잠 소화액에 대한 기초자료를 얻기 위해 상엽육잠과 인공사료육단을 공시하고 비교·분석하여 아래와 같은 결론을 얻었다. 1. 적색형광단백질은 50% 포화 acetone 용액에 침전하였고 n-butanol,용액중에 용해되지 않았으며, methanol 용액에는 용해되었다. 2. 상육잠과 인공사료육잠 소화액 acetone분획 전기영동은 이종도가 큰 단백질 band 부분에서 뚜렷한 차이가 있으며 상엽구에서만 첫 번째 band에서 적색형광이 관찰되었다. 3. 경과일수에 따른 상육잠소화액 전기영동상은 5령 1-3일에는 변화가 없으나 5령 4, 5일에 이종도가 큰 band에서 변화가 있었다. 4. 등전점전기영동결과 RFP는 PI 8-9의 염기성단백질이었다. 5. 상육잠소화액 acetone 분획의 SDS 전기영동상에 RFP로 추정되는 band가 나타났고 그 분자량은 27,000이었다. 6. 상육잠과 인공사료육잠소화액의 Sephadex G-75 permeation chromatography 결과 상육구 chromatogram에서는 16번부터 28번 사이에 3개의 흡수대가 있었으며 인공사료구 chromatogram에서는 18번부터 31번 사이에 2개의 흡수대가 있었다.