Editing C-terminus (section)

{{Short description|Type of an amino acid chain end}}
[[Image:Tetrapeptide structural formulae v.1.png|thumb|500px|A tetrapeptide (example: [[Valine|Val]]-[[Glycine|Gly]]-[[Serine|Ser]]-[[Alanine|Ala]]) with <span style="color:green;">'''green'''</span> highlighted ''N''-terminal α-amino acid (example: L-[[valine]]) and <span style="color:blue;">'''blue'''</span> marked ''C''-terminal α-amino acid (example: L-[[alanine]]).]]
The '''C-terminus''' (also known as the '''carboxyl-terminus''', '''carboxy-terminus''', '''C-terminal tail''', '''carboxy tail''', '''C-terminal end''', or '''COOH-terminus''') is the end of an [[amino acid]] chain ([[protein]] or [[polypeptide]]), terminated by a free [[carboxyl group]] (-COOH). When the protein is translated from messenger RNA, it is created from [[N-terminus]] to C-terminus. The convention for writing peptide sequences is to put the C-terminal end on the right and write the sequence from N- to C-terminus.