So did DNA come about through evolution of proteins?
No. DNA is the information system for life. It produces and regulates life functions and be able to copy itself for the next generation. Any information is a product of intelligence or creator. No non-intelligent natural process will create it.
DNA was created with the information to produce proteins for cellular reactions. It uses an intermediate, RNA (ribonucleic acid), to transfer this information to the cell machinery to form proteins. Proteins are the building blocks of living organisms. It can only be created within a cell. No amount of amino acid manipulation will be able to form a protein. It takes a living cell to produce it. This is why life only begats life. One of the facts of creation.
Thanks for the information. Do you believe that God used evolution as a tool in his creation?
Not evolution, but creation and natural selection. Creation science believes that we are an orchard of life with several bushes underneath forming the different kingdoms of living things. This is in contrast to one tree of life, a single common ancestor and long time (millions of years). There is no macroevolution where one species become a totally different species such as humans from apes or birds from dinosaurs. Furthermore, the different species form much more rapidly than what evolutionists believe. I am still waiting for a comprehensive report on the different groups of species.
Basically, species, subspecies, and varieties were conceived to have diversified from common ancestral stock. How these common ancestor groups of baramins, which God created as fully grown adult creatures, are formed are still being classified. In the baramins group are holobaramins, apobaramins, monobaramins and polybaramins. Under the holobaramin groups are humans, canines, cattle, turtles, etc. Further explanation is done here if you are interested.
Baraminology - CreationWiki, the encyclopedia of creation science