go_id,ontology,go_term,term_definition,evidence GO:0003756,MF,"protein disulfide isomerase activity","Catalysis of the rearrangement of both intrachain and interchain disulfide bonds in proteins.",IDA GO:0005783,CC,"endoplasmic reticulum","The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached).",IDA GO:0006457,BP,"protein folding","The process of assisting in the covalent and noncovalent assembly of single chain polypeptides or multisubunit complexes into the correct tertiary structure.",IEA GO:0016021,CC,"integral component of membrane","The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.",IEA GO:0034976,BP,"response to endoplasmic reticulum stress","Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stress acting at the endoplasmic reticulum. ER stress usually results from the accumulation of unfolded or misfolded proteins in the ER lumen.",IDA GO:0045454,BP,"cell redox homeostasis","Any process that maintains the redox environment of a cell or compartment within a cell.",IMP GO:0055114,BP,"oxidation-reduction process","A metabolic process that results in the removal or addition of one or more electrons to or from a substance, with or without the concomitant removal or addition of a proton or protons.",IEA