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Updated: Feb 23, 2026

Assessing Cellular Target Engagement by SHP2 PTPN11 Phosphatase Inhibitors
Published on: July 17, 2020
hSnd2 protein represents an alternative targeting factor to the endoplasmic reticulum in human cells
Sarah Haßdenteufel1, Mark Sicking1, Stefan Schorr1
1Department of Medical Biochemistry and Molecular Biology, Saarland University, Homburg, Germany.
Abstract:
Recently, understanding of protein targeting to the endoplasmic reticulum (ER) was expanded by the discovery of multiple pathways that function in parallel to the signal recognition particle (SRP). Guided entry of tail-anchored proteins and SRP independent (SND) are two such targeting pathways described in yeast. So far, no human SND component is functionally characterized. Here, we report hSnd2 as the first constituent of the human SND pathway able to support substrate-specific protein targeting to the ER. Similar to its yeast counterpart, hSnd2 is assumed to function as a membrane-bound receptor preferentially targeting precursors carrying C-terminal transmembrane domains. Our genetic and physical interaction studies show that hSnd2 is part of a complex network of targeting and translocation that is dynamically regulated.
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