Scientific Stream of Conscience II

In an initial RNA world, Protein would have tended to gather around RNA. Nucleic acid binding as one of the oldest traits of proteins. Going over to more protein-based function, did evolution proceed by create proteins that substituted for central RNA/DNA. Scaffolding proteins as replacement? Protein signalling complexes evolved from protein-Nuc. acid complexes? Look for similarities in Nuc. acid binding features and protein-protein interactions. Maybe it's not directly linear in evolution, but more as a derived feature, using already existing traits. Signallosomes as loose ribyzymes?