Involved in amino acid permease processing and required for the efficient translocation of structurally related amino acid permeases from the endoplasmic reticulum to the plasma membrane. SHR3 may function as a permease-specific 'adaptor' molecule that functions in conjunction with the SEC62/SEC63 complex. Yeast cells may require SHR3 to expedite the processing of permeases to ensure their rapid expression at the plasma membrane in response to changing environmental conditions. Monomer. Present with 6510 molecules/cell in log phase SD medium.