EHD4

EHD4 (EH domain-containing protein 4) is a member of the EHD family of ATP- and membrane-binding proteins that regulate endocytic membrane trafficking and endosomal remodeling, with a prominent role in early endosome function and cargo recycling pathways^[1][2]. EHD4 localizes to Rab5-, EEA1-, and Arf6-positive early endosomes, where it controls the exit of internalized cargo toward recycling and degradative routes and contributes to maintenance of normal endosomal morphology^[1]. Mechanistically, EHD4 participates in endosomal membrane remodeling and vesiculation, and depletion of EHD4 results in enlarged early endosomes that accumulate trafficking cargo, indicating a direct role in endosomal transport dynamics^[1]. EHD4 is also required for efficient recruitment and fission activity of its closely related paralog EHD1, demonstrating functional cooperation within the EHD protein family during endosomal recycling^[2]. Compared with other EHD isoforms, EHD4 displays a distinct functional emphasis on early endosomal regulation and serves as a critical upstream component that facilitates EHD1-mediated membrane fission events^[2]. In experimental models, genetic disruption of Ehd4 causes abnormalities in male germ-cell development, altered seminiferous tubule architecture, increased apoptosis, and reduced sperm production, supporting a role for EHD4 in tissue homeostasis and developmental processes^[3]. EHD4 has also been implicated in specialized trafficking events, including cadherin-associated transport and endothelial membrane recycling mechanisms, making it a useful target for studies of endocytic regulation and membrane trafficking networks^[4][5]. No widely established selective EHD4 agonists or inhibitors were identified in the cited literature.