DNA-PK 从HeLa 细胞核提取物中分离,是由 400kDa 的催化亚基与被命名为 Ku 的155kDa DNA 结合亚基( 后者又由大约85kDa和70kDa 两部分组成) 组成的异型二聚体。
原厂资料:
DNA-Dependent Protein Kinase (DNA-PK) phosphorylates several DNA-binding substrates in vitro, including the tumor suppressor protein p53, the SV40 large T antigen and several transcription factors. DNA-PK is thought to play a role in controlling gene regulation and cell growth.
DNA-PK is isolated from HeLa nuclear extracts as a complex consisting of a 400kDa catalytic subunit and a 155kDa heterodimeric DNA-binding component named Ku, which itself consists of subunits of approximately 85kDa and 70kDa.