+検索条件
-Structure paper
| タイトル | Structure and biochemical analyses suggest that PrkA/YeaG protein of Thermus thermophilus functions as a putative molecular chaperone. |
|---|---|
| ジャーナル・号・ページ | J Biochem, Year 2026 |
| 掲載日 | 2026年6月15日 |
著者 | Masayuki Torii / Ryo Kanno / Akira Mizoguchi / Bruno M Humbel / Kazutoshi Tani / Ryoji Masui / ![]() |
| PubMed 要旨 | Protein phosphorylation, a key post-translational modification, is mediated by various protein kinases. The bacterial PrkA/YeaG is recognized as an atypical protein kinase, but its activity remains ...Protein phosphorylation, a key post-translational modification, is mediated by various protein kinases. The bacterial PrkA/YeaG is recognized as an atypical protein kinase, but its activity remains elusive. This study investigated the structural and functional characteristics of a PrkA/YeaG homologue, TpkB, from Thermus thermophilus HB8. Using cryo-electron microscopy, the structures of TpkB in apo and AMPPNP-bound forms were determined, revealing a hexameric ring architecture characteristic of AAA + superfamily proteins. The TpkB protomer is comprised of an N-terminal domain, an ATPase domain, and a LID domain. The ATPase domain contains conserved sequence motifs associated with ATPase activity, whereas the other domains present a novel fold. TpkB exhibits structural similarity to MoxR family proteins, which possess chaperone-like functions in conjunction with von Willebrand factor A (vWA) domain proteins. Structural and gene neighborhood analyses suggested a functional link between PrkA/YeaG proteins and vWA domain proteins. Biochemical analyses demonstrated that TpkB exhibited ATPase activity and chaperone-like activity, but lacked detectable protein kinase activity. These findings establish TpkB as a novel member of the AAA+ superfamily with potential chaperone functions, providing new insights into the PrkA/YeaG family. |
リンク | J Biochem / PubMed:42294598 |
| 手法 | EM (単粒子) |
| 解像度 | 2.3 - 3.2 Å |
| 構造データ | EMDB-66911, PDB-9xip: EMDB-66912, PDB-9xiq: EMDB-66913, PDB-9xir: |
| 化合物 | ![]() ChemComp-ZN: ![]() ChemComp-HOH: ![]() ChemComp-ANP: |
| 由来 |
|
キーワード | STRUCTURAL GENOMICS / HYPOTHETICAL PROTEIN / ATP-BINDING / PRK/YEAG FAMILY |
ムービー
コントローラー
構造ビューア
万見文献について



著者
リンク









thermus thermophilus hb8 (バクテリア)
キーワード