Rho-related GTP-binding protein RhoH (RHOH)

Negative regulator of hematopoietic progenitor cell proliferation, survival and migration. Required for phosphorylation of CD3Z, membrane translocation of ZAP70 and subsequent activation of the ZAP70-mediated pathways.

Essential for efficient beta-selection and positive choice by encouraging the ZAP70-dependent phosphorylation of the LAT signalosome through pre-TCR and TCR signaling. Crucial for thymocyte maturation during DN3 to DN4 transition and through positive selection.