The Ancient Gamete Fusogen HAP2 Is a Eukaryotic Class II Fusion Protein.

Abstract:

:Sexual reproduction is almost universal in eukaryotic life and involves the fusion of male and female haploid gametes into a diploid cell. The sperm-restricted single-pass transmembrane protein HAP2-GCS1 has been postulated to function in membrane merger. Its presence in the major eukaryotic taxa-animals, plants, and protists (including important human pathogens like Plasmodium)-suggests that many eukaryotic organisms share a common gamete fusion mechanism. Here, we report combined bioinformatic, biochemical, mutational, and X-ray crystallographic studies on the unicellular alga Chlamydomonas reinhardtii HAP2 that reveal homology to class II viral membrane fusion proteins. We further show that targeting the segment corresponding to the fusion loop by mutagenesis or by antibodies blocks gamete fusion. These results demonstrate that HAP2 is the gamete fusogen and suggest a mechanism of action akin to viral fusion, indicating a way to block Plasmodium transmission and highlighting the impact of virus-cell genetic exchanges on the evolution of eukaryotic life.

journal_name

Cell

journal_title

Cell

authors

Fédry J,Liu Y,Péhau-Arnaudet G,Pei J,Li W,Tortorici MA,Traincard F,Meola A,Bricogne G,Grishin NV,Snell WJ,Rey FA,Krey T

doi

10.1016/j.cell.2017.01.024

subject

Has Abstract

pub_date

2017-02-23 00:00:00

pages

904-915.e10

issue

5

eissn

0092-8674

issn

1097-4172

pii

S0092-8674(17)30109-5

journal_volume

168

pub_type

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