Micro-heterogeneity of Storage Glutelin in Rice Seed

The storage glutelin in rice ( Oryza sativa L.) seeds could be separated at least into more than 13 acidic and 19 basic polypeptides by two dimensional electrophoresis. Rice glutelin might be mainly controlled by about six major genes according to the expression of glutelin polypeptides. The acidic polypeptide of glutelin could be clearly separated into two groups by peptide mapping and N-terminal amino acid sequence analysis. These two groups were just in accord with the GluA and GluB subfamilies exactly.

重组人粒细胞刺激因子的N端氨基酸序列异质性分析

目的:分析重组人粒细胞刺激因子(rhG-CSF)的N端异质性。方法:采用反相超高效液相色谱法分离rhG-CSF中N端不一致的各组分;色谱条件:采用Waters BEH 300 C4(2.1 mm×100 mm,1.7μm)色谱柱,以0.1%三氟乙酸水溶液(A)-0.1%三氟乙酸乙腈溶液(B)为流动相,梯度洗脱,流速0.2 mL·min^(-1)。分别收集各组分并冷冻干燥,采用N端测序仪测定各组分的N端氨基酸序列;液质联用测定rhG-CSF的相对分子质量,对N端测序结果进行验证质谱仪采用Waters公司Xevo G2-S质谱仪,正离子电喷雾离子源,毛细管电压3.0 kV,锥孔电压40 V,去溶剂气体温度350℃,去溶剂气体流速800 L·h^(-1),扫描范围(m/z)500～3 000。结果:色谱分离得到3个组分;N端氨基酸序列测定结果显示,3个组分分别为rhG-CSF主成分及2个N端异质性相关蛋白;质谱相对分子质量测定结果与N端测序结果一致。结论:应用色谱法及质谱法可对rhG-CSF中的N端异质性相关蛋白进行分析检测,检测结果可为国产rhG-CSF制品的质量控制和标准提升提供参考和数据支持。