Updated project metadata. Akkermansia muciniphila is recognized as a promising probiotic that improves the symptoms of a variety of diseases. However, the role and mechanism of A. muciniphila in regulating intestinal homeostasis remain to be explored. Here, we discovered that A. muciniphila was dramatically increased during colitis recovery, and its colonization greatly increased goblet cells to protect the intestinal barrier in mice. Amuc_0904, a previously uncharacterized A. muciniphila outer membrane protein, was identified to induce goblet cell differentiation.We want to find the receptors that 904 interacts with cells to explore the detailed mechanism.