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YeaK is an uncharacterized Echerichia coli protein with a YbaK-like domain of unknown function. The YbaK-like domain family includes the INS amino acid-editing domain of the bacterial class II prolyl tRNA synthetase (ProRS), and it's trans-acting homologs, YbaK, and ProX. The primary function of INS is to hydrolyze mischarged cysteinyl-tRNA(Pro)'s, thus helping ensure the fidelity of translation. Organisms whose ProRS lacks the INS domain express a single-domain INS homolog such as YbaK, ProX, or PrdX which supplies the function of INS in trans.
Jiyao W et al.(2023). "The conserved domain database in 2023.",