Question

which bond is bond is present between N end and C end of protein
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Answer 1

The N-terminus (also known as the amino-terminus, NH2-terminus, N-terminal end or amine-terminus) is the start of a protein or polypeptide referring to the free amine group (-NH2) located at the end of a polypeptide. Within a peptide, the amine group is bonded to another carboxylic group in a protein to make it a chain, but since the end amino acid of a protein is only connected at the carboxy- end, the remaining free amine group is called the N-terminus. By convention, peptide sequences are written N-terminus to C-terminus, left to right in LTR languages.[1] This correlates the translation direction to the text direction (because when a protein is translated from messenger RNA, it is created from N-terminus to C-terminus - amino acids are added to the carboxyl end).

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