Hirano Yoshinori, Gao Yong-Guang, K Simanshu Dhirendra, J Stephenson Daniel, T Vu Ngoc, Malinina Lucy, E Chalfant Charles, J Patel Dinshaw, E Brown Rhoderick
Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY, U.S.A.
Graduate School of Biological Sciences, Nara Institute of Science and Technology (NAIST), Takayama, Japan.
Bio Protoc. 2021 Feb 5;11(3):e3906. doi: 10.21769/BioProtoc.3906.
Previous expression/purification strategies for cytosolic phospholipase Aα C2-domain in have relied on refolded protein recovered from inclusion bodies and sometimes containing C-terminal Cys139Ala and Cys141Ser substitutions to eliminate potential refolding complications induced by Cys residues. The protocol presented herein describes an effective method for the expression of cytosolic phospholipase Aα C2-domain in soluble form in and subsequent purification to homogeneity. This protocol, which utilizes a cleavable 6xHis-SUMO tag, has recently been used to gain insights into the structural basis of phosphatidylcholine recognition by the C2-domain of cytosolic phospholipase Aα ( Hirano , 2019 ).
以往在大肠杆菌中表达/纯化胞质磷脂酶Aα C2结构域的策略依赖于从包涵体中回收的重折叠蛋白,该蛋白有时含有C端Cys139Ala和Cys141Ser取代,以消除由半胱氨酸残基引起的潜在重折叠复杂性。本文介绍的方案描述了一种在大肠杆菌中以可溶形式表达胞质磷脂酶Aα C2结构域并随后纯化至均一性的有效方法。该方案利用了一种可切割的6xHis-SUMO标签,最近已被用于深入了解胞质磷脂酶Aα的C2结构域识别磷脂酰胆碱的结构基础(Hirano,2019)。