Authors: Terrance Cameron Stewart
Comments: 18 pages. e-mail: TC_STEWART20 (at) YAHOO (dot) COM
This model proposes a minimally constructed replicating protocell
that exploits only a positive, a negative and a neutral amino acid
to build membranes, genes and ion channels. This transition from
chemical to biological evolution would result from a charged peptide
that can function as a template to fuse peptide fragments, and act
as a membrane gate.
The nucleic genetic code may have originated as a single base codon that
recognized three types of amino acid residue. A two base codon with three base
types could code for nine types of residue. An increase to four base types
would produce 16 residue possibilities. The modern code now utilizes a three
base codon and four base types to yield 20 types of amino acid. tRNA
synthetases and the genetic code appear to be linked together by mutual
evolution. The evolving transition to a nucleic code would support a greater
variety of amino acids and proteins, and thus complete the creation of life.