To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S2. MD simulation of the E form of ERp44 with Cys29 protonated (related to Fig. 4 B and C). The interactions formed between the a domain (light green) and the shielding segment of the C tail (magenta) are highlighted (related to Fig. 4 B and C). Structural basis of pH-dependent client binding by ERp44, a key regulator of protein secretion at the ER–Golgi interface Satoshi Watanabe, Manami Harayama, Shingo Kanemura, Roberto Sitia, and Kenji Inaba PNAS. 2017. DOI: 10.1073/pnas.1621426114 Download Original Video Browse All Videos »