9VCC

Cryo-EM structure of Suv3 dimer

9VCC の概要

• エントリーDOI: 10.2210/pdb9vcc/pdb
• EMDBエントリー: 64952
• 分子名称: ATP-dependent RNA helicase SUPV3L1, mitochondrial (1 entity in total)
• 機能のキーワード: helicase, suv3 dimer, hydrolase
• 由来する生物種: Homo sapiens (human)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 170901.75

構造登録者

Patra, M.,Yuan, H.S. (登録日: 2025-06-05, 公開日: 2026-05-20, 最終更新日: 2026-06-24)

主引用文献

Patra, M.,Jain, M.,Li, Y.C.,Chen, Y.P.,Golzarroshan, B.,Yuan, H.S.
Asymmetric dimeric assembly of Suv3 helicase facilitates processive RNA unwinding.
Nat Commun, 17:-, 2026

PubMed Abstract: Human Suv3 is a dimeric helicase that collaborates with the exoribonuclease PNPase to mediate RNA decay and surveillance in mitochondria. Despite its pivotal role in maintaining mitochondrial homeostasis, the molecular mechanism underlying Suv3-mediated RNA unwinding has remained elusive. Here, we present near-atomic-resolution cryogenic electron microscopy structures of Suv3 captured in four functional states: the apo form, two binary complexes with ADP and single-stranded RNA (ssRNA), and a ternary complex with ssRNA and an ATP analog (AMP-PNP). These structures reveal an unexpected asymmetric dimeric organization, in which only one of the two protomers engages in the initial binding of ADP, ssRNA, or both ssRNA and AMP-PNP. Complementary biochemical analyses demonstrate that Suv3 dimerization significantly enhances RNA-binding and unwinding efficiency in an ATP-hydrolysis-dependent manner. Together, these findings provide key insights into the dimeric architecture of Suv3 and establish a mechanistic framework for its coordinated function in processive RNA unwinding.

PubMed: 41986356
DOI: 10.1038/s41467-026-71901-2

実験手法

ELECTRON MICROSCOPY (3.92 Å)