Enables ribosome binding activity. Predicted to be involved in SRP-dependent cotranslational protein targeting to membrane, translocation and posttranslational protein targeting to membrane, translocation. Predicted to act upstream of or within protein transport. Predicted to be located in endoplasmic reticulum and membrane. Predicted to be integral component of membrane. Predicted to be part of Sec61 translocon complex. Orthologous to human SEC61A2 (SEC61 translocon subunit alpha 2). [provided by Alliance of Genome Resources, Apr 2022]