닭의 근섬유(筋纖維) 단백질(蛋白質) 돼지의 백혈구(白血球)에서 추출(抽出)한 lysosomal proteinase에 의해서 분해(分解)될 때 미치는 NaCl과 pH의 영향(影響)에 대해서 연구(硏究)하였다. Leucocyte lysosomal proteinase에 의한 근섬유(筋纖維) 단백질(蛋白質)의 분해(分解)는 다른 pH를 갖는 Tris-maleate buffer에서 partial hydrolysis로 진행(進行)하였다. 분해(分解)는 높은 pH에서 더욱 심화(深化)되었으며, 여기에 NaCl이 첨가(添加)되었을 때 proteinase의 activity는 pH의 고저(高低)에 관계(關係)없이 더욱 증가(增加)함을 보여주었다.
The influence of NaCl and pH on degradation of chicken breast muscle myofibrillar proteins by porcine leukocyte lysosomal proteinases was investigated. The degradation reactions were carried out at $38^{circ}C$ for 24hours under different conditions. The degradation of myofibrillar proteins by leukocyte lysosomal enzymes at various pH values was limited to partial hydrolysis. Reactions at higher pH values resulted in lower molecular weight degradation products while reactions at lower pH resulted in higher molecular weight degradation products. When NaCl was added into the reaction mixture, enzyme activities of degradation were increased at all pH values studied, as evidenced by NPN-analysis and SDS-PAGE. More severe degradation was observed with higher salt concentration. The concentration of 0.5M NaCl in the reaction mixture gave more degradation of myosin heavy chain by enzyme than that of 0.1M NaCl.
