Structural basis of pH-dependent client binding by ERp44, a key regulator of protein secretion at the ER-Golgi interface [Biochemistry]

ERp44 retrieves some endoplasmic reticulum (ER)-resident enzymes and immature oligomers of secretory proteins from the Golgi. Association of ERp44 with its clients is regulated by pH-dependent mechanisms, but the molecular details are not fully understood. Here we report high-resolution crystal structures of human ERp44 at neutral and weakly acidic pH....

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