Signal peptidase complex subunit 1

Component of the signal peptidase complex (SPC) which catalyzes the cleavage of N-terminal signal sequences from nascent proteins as they are translocated into the lumen of the endoplasmic reticulum. Dispensable for SPC enzymatic activity (By similarity).; (Microbial infection) Required for the post-translational processing of proteins involved in virion assembly and secretion from flaviviruses such as West Nile virus (WNV), Japanese encephalitis virus (JEV), Dengue virus type 2 (DENV-2), Yellow Fever virus (YFV), Zika virus (ZIKV) and hepatitis C virus (HCV). Plays a key role in the post-translational processing of flaviviral structural proteins prM, E, and NS1. In HCV, it is involved in virion assembly where it promotes the interaction between HCV virus proteins NS2 and E2.