Early within the twentieth century, previous to the definitive identification of DNA because the genetic materials, proteins had been thought-about a robust candidate for this function. This angle stemmed from their recognized structural complexity and variety. The sheer variety of completely different amino acids (20), coupled with the potential for these amino acids to be organized in nearly limitless sequences, advised a capability to encode an unlimited quantity of knowledge. This was in distinction to the comparatively easy construction of DNA, which was then understood to be composed of solely 4 nucleotide bases.
The obvious complexity of proteins provided a compelling rationalization for the range of traits noticed in dwelling organisms. Scientists believed that the refined variations in protein construction may account for the fine-grained variations between people and species. Moreover, proteins had been recognized to play a central function in enzymatic exercise, metabolic pathways, and mobile construction, reinforcing the concept they had been the grasp molecules controlling life processes. This central function led to the idea that proteins additionally held the blueprints for establishing and sustaining the organism.
