- #1
nemzy
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in some archaea, it uses TTG start codon most of the time, rather than the conventional ATG.. Does anyone know what the significance of this is?
A start codon is a specific sequence of DNA nucleotides that signals the beginning of a protein-coding gene. It is the first codon in an mRNA transcript and is necessary for the initiation of protein synthesis.
Archaea are a group of single-celled microorganisms that are genetically distinct from bacteria and eukaryotes. They are known for their ability to thrive in extreme environments and are often found in places such as hot springs, salt flats, and deep-sea hydrothermal vents.
Some archaea use different start codons due to variations in their genetic code. While most organisms use the start codon AUG to begin protein synthesis, some archaea have evolved to use alternative start codons such as GUG or UUG.
Archaea use different start codons in a similar way to other organisms. The start codon is recognized by a specific protein called an initiator tRNA, which carries the first amino acid in a protein chain. The ribosome then begins translation at the start codon, resulting in the formation of a new protein.
The use of different start codons by archaea is significant because it highlights the diversity and adaptability of these microorganisms. It also provides insight into the evolution of the genetic code and how it has evolved to accommodate different organisms and their unique environments.