Study on Serine Proteinase in the Muscle of Yesso Scallops (Mizuhopecten yessoensis)
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摘要: 为了探究虾夷扇贝肌肉冷藏过程中内源蛋白酶对其质构的影响,本文对虾夷扇贝肌肉在4 ℃下冷藏7 d过程中肌肉质构及蛋白变化进行测定,结果表明,整个冷藏过程中扇贝肌肉硬度、弹性、咀嚼性和粘性整体呈下降趋势。SDS-PAGE分析显示肌肉蛋白在第3 d开始出现明显降解。在内源酶活力方面,丝氨酸蛋白酶(Serine proteinase,SP)活力在冷藏2 d后开始急剧下降。通过硫酸铵盐析、离子交换、凝胶过滤和疏水柱层析等从虾夷扇贝肌肉中获得高度纯化的丝氨酸蛋白酶并对其酶学性质进行研究。SDS-PAGE和明胶酶谱结果表明,SP在天然状态下主要以分子量约为52 kDa的二聚体形式存在。SP的最适pH为9.0,最适温度为37 ℃。SP特异性水解羧基侧P1位含有精氨酸或赖氨酸残基的底物。丝氨酸蛋白酶特异性抑制剂PMSF、Leupeptin、Pefabloc SC、Benzamidine分别能抑制其97%、98%、90%和85%的酶活力;金属离子Fe2+、Zn2+、Cu2+也能明显抑制SP的酶活力。37 ℃下SP可有效降解扇贝肌原纤维蛋白,为揭示SP对扇贝肌肉蛋白的品质影响提供参考。Abstract: To investigate the effect of endogenous protease on the texture of Yesso scallop muscle during cold storage, the texture and protein change related indexes of Yesso scallop muscle was measured during 4 ℃ cold storage 7 d with a purpose to identify the functions of proteinases. The results showed that the hardness, springiness, chewiness and gumminess generally decreased during the whole cold storage process. SDS-PAGE analysis revealed that muscular proteins began to degrade obviously on the third day. In terms of enzyme activity, serine proteinase (SP) activity began to decrease sharply after 2 days of cold storage. Serine proteinase was purified from the muscle of Yesso scallop by ammonium sulfate precipitation, ion exchange chromatography, gel filtration and hydrophobic chromatography. SDS-PAGE and gelatin zymogram showed that in native condition SP was in homodimer form with molecular weight of 52 kDa. The optimum pH of SP was 9.0 and the optimum temperature was 37 ℃. SP specifically hydrolyzes substrates containing arginine or lysine residues at P1 position on the carboxyl side. Serine protease specific inhibitors including PMSF, Leupeptin, Pefabloc SC and Benzamidine could inhibit the activity of SP by 97%, 98%, 90% and 85%, respectively. Metal ions Fe2+, Zn2+ and Cu2+ could also significantly suppress the activity of SP. SP could effectively degrade scallop myofibrillar at 37 ℃, which delivered a reference for revealing the effect of SP on the quality of Yesso scallop muscle protein.
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Key words:
- Mizuhopecten yessoensis /
- serine proteinase /
- texture /
- purification /
- characterization /
- muscle
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表 1 冷藏过程中虾夷扇贝肌肉质构参数变化
Table 1. The change of texture parameters in Yesso callop muscle during cold storage
时间 (d) 硬度 (gf) 咀嚼性(gf) 粘性(gf) 弹性(gf) 0 670±42b 255±18 a 321±2 b 0.34±0.07b 1 736±52a 176±11b 372±17a 0.37±0.04a 2 584±45c 152±8c 276±19c 0.33±0.02b 3 457±38d 132±4d 253±11d 0.32±0.03b 4 330±33e 126±5e 227±12e 0.31±0.02c 5 206±25f 115±2f 176±15f 0.28±0.01d 6 146±27g 102±3g 107±8g 0.27±0.03e 7 68±12h 93±4g 99±7g 0.25±0.02f 注:同列不同小写字母表示差异显著(P<0.05)。 表 2 虾夷扇贝丝氨酸蛋白酶的底物特异性分析
Table 2. Substrate characterization of the SP from Yesso scallop
底物(10 µmol/L) 相对活力(%) Boc-Phe-Ser-Arg-MCA 100±0.0 Boc-Gln-Ala-Arg-MCA 123±0.3 Boc-Leu-Lys-Arg-MCA 116±0.4 Boc-Ala-Gly-Pro-Arg-MCA 108±0.2 Boc-Val-Pro-Arg-MCA 82±1.2 Boc-Glu-Lys-Lys-MCA 36±0.4 Z-Phe-Arg-MCA 36±2.3 Z-Arg-Arg-MCA 37±0.9 Suc-Leu-Leu-Val-Tyr-MCA 0 Suc-Ala-Ala-Pro-MCA 0 Arg-MCA 0 表 3 蛋白酶抑制剂对丝氨酸蛋白酶活力的影响
Table 3. Inhibitory effect of different proteinase inhibitors on the activity of SP
抑制剂 浓度(mmol/L) 相对活力(%) control 0 100±0.0 EGTA 1 47±0.2 EDTA 1 90±0.1 10 93±0.3 1,10-phenanthroline 1 96±0.2 5 84±0.2 PMSF 1 86±0.1 10 3±0.4 E-64 0.015 78±0.1 0.1 80±0.1 Benzazmidine 0.5 15±0.3 5 7±0.2 Pefabloc SC 0.2 11±0.5 2 3±0.1 Leupeptin 0.01 3±0.1 0.03 2±0.6 表 4 金属离子对丝氨酸蛋白酶活力的影响
Table 4. Effect of metal ions on the activity of SP
金属离子 浓度(mmol/L) 相对活力(%) control 0 100±0.0 Ca2+ 0.01 58±0.4 0.05 72±0.1 0.1 75±0.2 Fe2+ 0.01 78±0.3 0.05 73±0.5 0.1 17±0.4 Zn2+ 0.01 90±0.1 0.05 36±0.3 0.1 16±0.3 Mg2+ 0.01 96±0.3 0.05 95±0.1 0.1 91±0.2 Ba2+ 0.01 98±0.5 0.05 89±0.2 0.1 81±0.2 Cu2+ 0.01 55±0.3 0.05 72±0.1 0.1 11±0.5 Mn2+ 0.01 95±0.3 0.05 97±0.5 0.1 96±0.5 -
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