Leng C H, Brodsky J L, Wang C
Institute of Molecular Biology, Academia Sinica, National Defense Medical Center, Taipei, Taiwan.
Protein Sci. 1998 May;7(5):1186-94. doi: 10.1002/pro.5560070513.
A DnaJ-like protein, RDJ1, was isolated from a rat brain cDNA library. The protein is predicted to have 397 amino acid residues and shares 99% identity to that of HDJ2, a human DnaJ-like protein. RDJ1 was also shown to rescue the temperature-sensitive lethality of a strain containing a mutated cytosolic DnaJ in yeast, ydj1-151. Fragments containing the J-domain of RDJ1 either with or without the G/F motif were expressed in Escherichia coli. The purified proteins stimulated the ATPase activity of hsc70 and of the 60-kDa N-terminal fragment of hsc70. These results imply that RDJ1 can interact with the N-terminal 60-kDa fragment of hsc70 to activate ATP hydrolysis by hsc70.
一种类DnaJ蛋白RDJ1是从大鼠脑cDNA文库中分离得到的。该蛋白预计含有397个氨基酸残基,与人类类DnaJ蛋白HDJ2的氨基酸序列一致性达99%。此外,RDJ1能够拯救酵母中含有突变胞质DnaJ的菌株ydj1 - 151的温度敏感性致死效应。含有RDJ1的J结构域且带有或不带有G/F基序的片段在大肠杆菌中表达。纯化后的蛋白刺激了hsc70以及hsc70 60 kDa N端片段的ATP酶活性。这些结果表明,RDJ1能够与hsc70的N端60 kDa片段相互作用,从而激活hsc70的ATP水解。