Molecular Code For Protein Insertion In The Endoplasmic Reticulum Membrane Is Similar For N_(in)-c_(out) And N_(out)-c_(in) Transmembrane Helices

摘要

Transmembrane a-helices in integral membrane proteins can have two orientations in the membrane: N_(in)-C_(out) or N_(out)-C_(in). Previous studies of model N_(out)-C_(in) transmembrane segment have led to a detailed, quantitative picture of the "molecular code" that relates amino acid sequence to membrane insertion efficiency in vivo [Hessa T, et al. (2007) Molecular code for transmembrane helix recognition by the Sec61 translocon. Nature 450:1026-1030], but whether the same code applies also to N_(in)-C_(out) transmembrane helices is unknown. Here, we show that the contributions of individual amino acids to the overall efficiency of membrane insertion are similar for the two kinds of helices and that the threshold hydrophobicity for membrane insertion can be up to ≈ 1 kcal/mol lower for N_(in)-C_(out) compared with N_(out)-C_(in) transmembrane helices, depending on the neighboring helices.