DnaJ homolog

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spinqualitylabelsall models Human DnaJ homolog subfamity B member 1 peptide-binding domain dimer (cyan and green) complex with 3 C-terminal peptides of heat shock protein 70 (pink, magenta, violet) (PDB code 3agy) Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image Contents 1 Function 2 Disease 3 Relevance 4 Structural highlights Function DnaJ homolog subfamily A member 1 (DnaJA1) is a co-chaperone for HSPA8/Hsc70. DnaJA1 stimulates ATP synthesis and has a role in protein transport into mitochondria[1]. DnaJ homolog subfamily B member 1 (DnaJB1) interacts with HSP70. DnaJB1 stimulates ATP synthesis and the folding of unfolded proteins mediated by HSPA1A [2]. Disease DnaJA1 is down-regulated 5-fold in pancreatic cancer and is targeted as a biomarker for it. Relevance DnaA1 promotes apoptosis in response to cell stress mediated by exposure to UV[3]. Structural highlights includes various hydrogen bonds, salt bridges and hydrophobic interactions. The octapeptide assumes an extended conformation and forms an antiparallel β sheet with β2 domain I[4].

3D structures of DnaJ homolog

Updated on 04-November-2018

References

1. ↑ Terada K, Mori M. Human DnaJ homologs dj2 and dj3, and bag-1 are positive cochaperones of hsc70. J Biol Chem. 2000 Aug 11;275(32):24728-34. PMID:10816573 doi:http://dx.doi.org/10.1074/jbc.M002021200
2. ↑ Rauch JN, Gestwicki JE. Binding of human nucleotide exchange factors to heat shock protein 70 (Hsp70) generates functionally distinct complexes in vitro. J Biol Chem. 2014 Jan 17;289(3):1402-14. doi: 10.1074/jbc.M113.521997. Epub 2013 , Dec 5. PMID:24318877 doi:http://dx.doi.org/10.1074/jbc.M113.521997
3. ↑ Stark JL, Mehla K, Chaika N, Acton TB, Xiao R, Singh PK, Montelione GT, Powers R. Structure and function of human DnaJ homologue subfamily a member 1 (DNAJA1) and its relationship to pancreatic cancer. Biochemistry. 2014 Mar 4;53(8):1360-72. doi: 10.1021/bi401329a. Epub 2014 Feb 19. PMID:24512202 doi:http://dx.doi.org/10.1021/bi401329a
4. ↑ Suzuki H, Noguchi S, Arakawa H, Tokida T, Hashimoto M, Satow Y. Peptide-binding sites as revealed by the crystal structures of the human Hsp40 Hdj1 C-terminal domain in complex with the octapeptide from human Hsp70. Biochemistry. 2010 Oct 5;49(39):8577-84. Epub 2010 Sep 9. PMID:20809635 doi:10.1021/bi100876n