Updated publication reference for PubMed record(s): 31270210. c-di-GMP and c-di-AMP are important conserved second messenger in bacteria, they play a critical role in a wide range of cellular processes, such as motility, virulence, biofilm formation, cell-cycle progression and cell development, but there are only two c-di-GMP receptors and one c-di-AMP receptors were identified in mycobacteria so far, to identify more c-di-GMP and c-di-AMP receptors we compare the protein expression level of c-di-GMP or c-di-AMP synthesis enzyme overexpression strain with the wild type Mycobacterium smegmatis.