An acidic residue within the OCT4 dimerization interface of SOX17 is necessary and sufficient to overcome its pluripotency-inducing activity.

ABSTRACT: SOX17 directs the differentiation toward endoderm and acts as a human germline specifier. We previously found that the replacement of glutamate at position 57 of the high-mobility group (HMG) box with the basic lysine residue in SOX2 alters interactions with OCT4 and turns SOX17 into a pluripotency factor. Here, we systematically interrogated how mutations at this critical position affect the cellular reprogramming activity of SOX17 in mouse and human. We found that most mutations turn SOX17 into a pluripotency factor regardless of their biophysical properties except for acidic residues and proline. The conservative mutation to an aspartate allows the SOX17E57D protein to maintain a self-renewing endodermal state. We showed that only the glutamate in the wild-type protein blocks the format

SUBMITTER: Ho SY 

PROVIDER: S-EPMC11960519 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature