Structural duality enables a single protein to act as a toxin-antidote pair for meiotic drive

• 成果类型: Article
• 署名作者: Hua, Yu; Zhang, Jianxiu; Yang, Man- Yun; Ren, Jing- Yi; Suo, Fang; Liang, Lingfei; Dong, Meng- Qiu; Ye, Keqiong; Du, Li - Lin
• 署名单位: National Institute of Biological Sciences, Beijing; Chinese Academy of Sciences; Institute of Biophysics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Tsinghua University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-11324
• DOI: 10.1073/pnas.2408618121
• 发表日期: 2024-11-05
• 关键词: selfish genetic elements; schizosaccharomyces-pombe; nuclear-envelope; yeast; meiosis; SYSTEM; expression; sterility; mutants; DESIGN

摘要

In sexual reproduction, selfish genetic elements known as killer meiotic drivers (KMDs) bias inheritance by eliminating gametes that do not carry them. The selective killing behavior of most KMDs can be explained by a toxin-antidote model, where a toxin harms all gametes while an antidote provides resistance to the toxin in carriers. This study investigates whether and how the KMD element tdk1 in the fission yeast Schizosaccharomyces pombe deploys this strategy. Intriguingly, tdk1 relies on a single protein product, Tdk1, for both killing and resistance. We show that Tdk1 exists in a nontoxic tetrameric form during vegetative growth and meiosis but transforms into a distinct toxic form in spores. This toxic form acquires the ability to interact with the histone reader Bdf1 and assembles into supramolecular foci that disrupt mitosis in noncarriers after spore germination. In contrast, Tdk1 synthesized during germination of carrier spores is nontoxic and acts as an antidote, dismantling the preformed toxic Tdk1 assemblies. Replacement of the N-terminal region of Tdk1 with a tetramer-forming peptide reveals its dual roles in imposing an autoinhibited tetrameric conformation and facilitating the assembly of supramolecular foci when autoinhibition is released. Moreover, we successfully reconstituted a functional KMD element by combining a construct that exclusively expresses Tdk1 during meiosis (toxin-only) with another construct that expresses Tdk1 specifically during germination (antidote-only). This work uncovers a remarkable example of a single protein employing structural duality to form a toxin-antidote pair, expanding our understanding of the mechanisms underlying toxin-antidote systems.