8OFB

Crystal Structure of T. maritima reverse gyrase with a minimal latch, hexagonal form

8OFB の概要

• エントリーDOI: 10.2210/pdb8ofb/pdb
• 関連するPDBエントリー: 7fse 7fsf
• 分子名称: Reverse gyrase, HEXAETHYLENE GLYCOL, ZINC ION, ... (6 entities in total)
• 機能のキーワード: topoisomerase, dna supercoiling, archaea, helicase, hydrolase
• 由来する生物種: Thermotoga maritima MSB8
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 122311.72

構造登録者

Klostermeier, D.,Rasche, R.,Mhaindarkar, V.,Kummel, D.,Rudolph, M.G. (登録日: 2023-03-15, 公開日: 2023-04-26, 最終更新日: 2024-06-19)

主引用文献

Mhaindarkar, V.P.,Rasche, R.,Kummel, D.,Rudolph, M.G.,Klostermeier, D.
Structure of reverse gyrase with a minimal latch that supports ATP-dependent positive supercoiling without specific interactions with the topoisomerase domain.
Acta Crystallogr D Struct Biol, 79:498-507, 2023

PubMed Abstract: Reverse gyrase is the only topoisomerase that introduces positive supercoils into DNA in an ATP-dependent reaction. Positive DNA supercoiling becomes possible through the functional cooperation of the N-terminal helicase domain of reverse gyrase with its C-terminal type IA topoisomerase domain. This cooperation is mediated by a reverse-gyrase-specific insertion into the helicase domain termed the `latch'. The latch consists of a globular domain inserted at the top of a β-bulge loop that connects this globular part to the helicase domain. While the globular domain shows little conservation in sequence and length and is dispensable for DNA supercoiling, the β-bulge loop is required for supercoiling activity. It has previously been shown that the β-bulge loop constitutes a minimal latch that couples ATP-dependent processes in the helicase domain to DNA processing by the topoisomerase domain. Here, the crystal structure of Thermotoga maritima reverse gyrase with such a β-bulge loop as a minimal latch is reported. It is shown that the β-bulge loop supports ATP-dependent DNA supercoiling of reverse gyrase without engaging in specific interactions with the topoisomerase domain. When only a small latch or no latch is present, a helix in the nearby helicase domain of T. maritima reverse gyrase partially unfolds. Comparison of the sequences and predicted structures of latch regions in other reverse gyrases shows that neither sequence nor structure are decisive factors for latch functionality; instead, the decisive factors are likely to be electrostatics and plain steric bulk.

PubMed: 37204816
DOI: 10.1107/S2059798323002565

実験手法

X-RAY DIFFRACTION (2.39 Å)