7MDM

Structure of human p97 ATPase L464P mutant

7MDM の概要

• エントリーDOI: 10.2210/pdb7mdm/pdb
• EMDBエントリー: 23775
• 分子名称: Transitional endoplasmic reticulum ATPase, ADENOSINE-5'-DIPHOSPHATE (2 entities in total)
• 機能のキーワード: motor protein
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 539087.84

構造登録者

Zhang, X.,Gui, L.,Li, S.,Nandi, P.,Columbres, R.C.,Wong, D.E.,Moen, D.R.,Lin, H.J.,Chiu, P.-L.,Chou, T.-F. (登録日: 2021-04-05, 公開日: 2021-08-25, 最終更新日: 2024-05-29)

主引用文献

Zhang, X.,Gui, L.,Li, S.,Nandi, P.,Columbres, R.C.,Wong, D.E.,Moen, D.R.,Lin, H.J.,Chiu, P.L.,Chou, T.F.
Conserved L464 in p97 D1-D2 linker is critical for p97 cofactor regulated ATPase activity.
Biochem.J., 478:3185-3204, 2021

PubMed Abstract: p97 protein is a highly conserved, abundant, functionally diverse, structurally dynamic homohexameric AAA enzyme-containing N, D1, and D2 domains. A truncated p97 protein containing the N and D1 domains and the D1-D2 linker (ND1L) exhibits 79% of wild-type (WT) ATPase activity whereas the ND1 domain alone without the linker only has 2% of WT activity. To investigate the relationship between the D1-D2 linker and the D1 domain, we produced p97 ND1L mutants and demonstrated that this 22-residue linker region is essential for D1 ATPase activity. The conserved amino acid leucine 464 (L464) is critical for regulating D1 and D2 ATPase activity by p97 cofactors p37, p47, and Npl4-Ufd1 (NU). Changing leucine to alanine, proline, or glutamate increased the maximum rate of ATP turnover (kcat) of p47-regulated ATPase activities for these mutants, but not for WT. p37 and p47 increased the kcat of the proline substituted linker, suggesting that they induced linker conformations facilitating ATP hydrolysis. NU inhibited D1 ATPase activities of WT and mutant ND1L proteins, but activated D2 ATPase activity of full-length p97. To further understand the mutant mechanism, we used single-particle cryo-EM to visualize the full-length p97L464P and revealed the conformational change of the D1-D2 linker, resulting in a movement of the helix-turn-helix motif (543-569). Taken together with the biochemical and structural results we conclude that the linker helps maintain D1 in a competent conformation and relays the communication to/from the N-domain to the D1 and D2 ATPase domains, which are ∼50 Å away.

PubMed: 34405853
DOI: 10.1042/BCJ20210288

実験手法

ELECTRON MICROSCOPY (4.86 Å)