Messenger RNA
Messenger RNA is RNA created from a
Protein Encoding Gene.
Triplets of nucleotides (
codons) on the messenger RNA molecule fit into the anticodons of
Transfer RNA molecules that carry amino acids around inside the cell. The ribosomes (created by the
Ribosomal RNA) combine the amino acids to form the finished protein.
The first amino acid is almost always Methionine, represented by one of the start codons (AUG, GUG, CUG). In the DNA, the
Protein Encoding Gene will always end with a stop codon (TAA, TAG, TGA), but the stop codon does not become part of the messenger RNA and does not correspond to an amino acid (see also
Amino Acid Codes).
The genes that create messenger RNA are designated by the type
peg in the
FIG ID. The genes that produce
Transfer RNA and
Ribosomal RNA are designated by the type
rna. Thus,
fig|360108.3.peg.6 creates messenger RNA that will eventually be used to build an ABC transporter ATP-binding protein, but
fig|360108.3.rna.6 generates transfer RNA for the amino acid Asparagine.