The ssPA protein specifically forms an equimolar complex with RNA polymerase holoenzyme (RNAP), thereby distinguishing its interaction preference from the core enzyme. ssPA is primarily synthesized during amino acid starvation and accounts for more than 50% of the total protein produced under these conditions. ssPA Protein, E. coli (His) is the recombinant E. coli-derived ssPA protein, expressed by E. coli , with N-His labeled tag.
