Physical heterogeneity of muscle glycogen phosphorylase revealed by hydrostatic pressure dissociation.

Physical heterogeneity of muscle glycogen phosphorylase revealed by hydrostatic pressure dissociation.
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通过静水压力解离揭示肌糖原磷酸化酶的物理异质性。

DOI:
10.1021/bi00075a025
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发表时间:
1993
期刊:
影响因子:
2.9
通讯作者:
Weber,G
Weber,G
中科院分区:
生物学3区
文献类型:
--
作者:
Ruan,K;Weber,G

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材料和方法兔肌肉糖原磷酸化酶A(GPA)1来自Boehringer曼海姆(批号108 651)。将酶溶解在标准缓冲液中:0.05 M Tris,pH 7.5,0.001 M EDTA和DTT。通过注射器过滤器除去尺寸大于2 µ的颗粒物质。蛋白质浓度使用在280 nm处12.7 OD单位的比吸光率(对于1 cm深度的1%溶液)通过比色法测定(Graves & Wang,1972)。用Illingworth和科里(1953)的方法测定酶活性。在30 ℃和pH 6.8下,发现比活性为79单位/mg,1单位定义为每分钟从葡萄糖1-磷酸中释放1 µ无机磷酸盐的酶量。AMP、糖原和葡萄糖磷酸盐来自Sigma; 2-(二甲基氨基)萘-5-磺酰氯(DNS-C1)、1-苯胺基萘-8-磺酸盐(ANS)、琥珀酰亚胺芘丁酸盐(SPB)和荧光素5-异硫氰酸酯(FITC)来自Molecular Probes。所有其他试剂均为分析级。蒸馏水通过Millipore系统进一步纯化至阻力为18。
MATERIALS AND METHODSGlycogen phosphorylase A from rabbit muscle (GPA) 1 was from Boehringer Mannheim (Lot 108 651). The enzymes were dissolved in the standard buffer: 0.05 M Tris, pH 7.5, 0.001 M inboth EDTA and DTT. Particulatematter of size greater than 2 µ was removed by a syringe filter. Protein concentration was determined spectrophotometrically using a specific absorptivity at 280 nm of 12.7 OD units for 1-cm depth of 1% solution (Graves & Wang, 1972). Enzyme activity was assayed by the method of Illingworth and Cori (1953). At 30 C and pH 6.8 the specific activity was found to be 79 units/mg, one unit being defined as the amount of enzyme causing the release of 1 µ of inorganic phosphate from glucose 1-phosphate per minute. AMP, glycogen, and glucose phosphate were from Sigma; 2-(dimethylamino) naphthalene-5-sulfonyl chloride (DNS-C1), 1-anilinonaphthalene-8-sulfonate (ANS), succinimidopyrene butyrate (SPB), and fluorescein 5-isothiocyanate (FITC) were from Molecular Probes. All other reagents were of analytical grade. Distilled water was further purified by a Millipore system to a resistance of 18.
婴儿对两个和五个共振峰浊塞音的辨别在发音位置上有所不同。
DOI: 10.1121/1.390531
发表时间: 1984
期刊: The Journal of the Acoustical Society of America
影响因子: --
作者:
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通讯作者: Aslin,RN
DOI: 10.1121/1.388813
发表时间: 1983
期刊: The Journal of the Acoustical Society of America
影响因子: --
作者:
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DOI: 10.1016/0022-0965(72)90066-5
发表时间: 1972-01-01
影响因子: 2.6
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DOI: 10.1121/1.383639
发表时间: 1979-01-01
影响因子: 2.4
作者:
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婴儿的言语感知:基于鼻辅音发音位置的分类。
DOI: 10.1121/1.390871
发表时间: 1984
期刊: The Journal of the Acoustical Society of America
影响因子: --
作者:
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