Component of the signal recognition particle (SRP) complex receptor (SR) (By similarity). Ensures, in conjunction with the SRP complex, the correct targeting of the nascent secretory proteins to the endoplasmic reticulum membrane system (By similarity). May mediate the membrane association of SR (By similarity). . This is the function of SRPRB (SRP receptor subunit beta, Ensembl gene identifier ENSG00000144867).