Thermodynamic and structural consequences of changing a sulfur atom to a methylene group in the M13Nle mutation in ribonuclease-S.

Thermodynamic and structural consequences of changing a sulfur atom to a methylene group in the M13Nle mutation in ribonuclease-S.
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在核糖核酸酶-S 的 M13Nle 突变中将硫原子改变为亚甲基的热力学和结构后果。

DOI:
10.1021/bi00194a025
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发表时间:
1994
期刊:
影响因子:
2.9
通讯作者:
Richards,FM
Richards,FM
中科院分区:
生物学3区
文献类型:
--
作者:
Thomson,J;Ratnaparkhi,GS;Varadarajan,R;Sturtevant,JM;Richards,FM

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材料和方法材料。 RNase-S 购自 Sigma。通过 Doscher 和 Hirs (1967) 的方法或通过在 Cis 柱上使用 0-40% 乙腈梯度和 0.1% TFA 的反相 FPLC 从 RNase-S 中纯化 S-蛋白。 Bak-erbond prepscale 顺式树脂获自 J. T. Baker。 M13Nle 是一种 C 端酰胺化 S 肽类似物,其中 15 个残基截短形式的 S 肽的 Met 13 被正亮氨酸取代。该肽获自 Multiple Peptide Systems Inc.(圣地亚哥,加利福尼亚州)。粗肽通过反相 HPLC 在 Vydak Cn 柱上使用含有 0.1% TFA 的水/乙腈梯度进行纯化。将样品从水中冻干 2-3 次,以除去任何痕量的溶剂成分。滴定量热实验中观察到的低稀释热表明没有残留溶剂成分。将纯化的 S-蛋白和肽冻干并保存在 20°C 下。如前所述,在冻干之前,通过耶鲁大学医学院蛋白质和核酸化学设施的定量氨基酸分析来确定储备肽溶液的浓度(Connelly 等人,1990)。
MATERIALS AND METHODSMaterials. RNase-S was obtained from Sigma. S-protein was purified from RNase-S either by the method of Doscher and Hirs (1967) or by reverse-phase FPLC on a Cis column using a 0-40% acetonitrile gradient with 0.1% TFA. Bak-erbond prepscale Cis resin was obtained from J. T. Baker. M13Nle is a C-terminal amidated S-peptide analog in which Met 13 of the 15-residue truncated version of S-peptide was substituted by norleucine. This peptide was obtained from Multiple Peptide Systems Inc.(San Diego, CA). The crude peptide was purified by reverse-phase HPLC on a Vydak Cn column using a water/acetonitrile gradient containing 0.1% TFA. The samples were lyophilized 2-3 times from water to remove any traces of the solvent components. The low heats of dilution observed in the titration calorimetric experiments suggested that there were no residual solvent components. Purified S-protein and the peptide were lyophilized and stored at-20 C. The concentration of stock peptide solutions was determined by quantitative amino acid analysis at Yale University Medical School Protein and Nucleic Acid Chem-istry Facility prior to lyophilization as described earlier (Connelly et al., 1990).
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