7C4X

Crystal structure of germination protease from the spore-forming bacterium Paenisporosarcina sp. TG-20 in its inactive form

7C4X の概要

• エントリーDOI: 10.2210/pdb7c4x/pdb
• 分子名称: germination protease (2 entities in total)
• 機能のキーワード: germination protease, zymogen, hydrolase, protease
• 由来する生物種: Paenisporosarcina sp.
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 80497.26

構造登録者

Lee, J.H.,Lee, C.W. (登録日: 2020-05-18, 公開日: 2021-03-31, 最終更新日: 2023-11-29)

主引用文献

Lee, C.W.,Lee, S.,Jeong, C.S.,Hwang, J.,Chang, J.H.,Choi, I.G.,Kim, T.D.,Park, H.,Kim, H.Y.,Lee, J.H.
Structural insights into the psychrophilic germinal protease PaGPR and its autoinhibitory loop.
J.Microbiol, 58:772-779, 2020

PubMed Abstract: In spore forming microbes, germination protease (GPR) plays a key role in the initiation of the germination process. A critical step during germination is the degradation of small acid-soluble proteins (SASPs), which protect spore DNA from external stresses (UV, heat, low temperature, etc.). Inactive zymogen GPR can be activated by autoprocessing of the N-terminal pro-sequence domain. Activated GPR initiates the degradation of SASPs; however, the detailed mechanisms underlying the activation, catalysis, regulation, and substrate recognition of GPR remain elusive. In this study, we determined the crystal structure of GPR from Paenisporosarcina sp. TG-20 (PaGPR) in its inactive form at a resolution of 2.5 A. Structural analysis showed that the active site of PaGPR is sterically occluded by an inhibitory loop region (residues 202-216). The N-terminal region interacts directly with the self-inhibitory loop region, suggesting that the removal of the N-terminal pro-sequence induces conformational changes, which lead to the release of the self-inhibitory loop region from the active site. In addition, comparative sequence and structural analyses revealed that PaGPR contains two highly conserved Asp residues (D123 and D182) in the active site, similar to the putative aspartic acid protease GPR from Bacillus megaterium. The catalytic domain structure of PaGPR also shares similarities with the sequentially non-homologous proteins HycI and HybD. HycI and HybD are metal-loproteases that also contain two Asp (or Glu) residues in their active site, playing a role in metal binding. In summary, our results provide useful insights into the activation process of PaGPR and its active conformation.

PubMed: 32870483
DOI: 10.1007/s12275-020-0292-0

実験手法

X-RAY DIFFRACTION (2.5 Å)