Final answer:
The one-letter abbreviation for the peptide sequence Thr-Lys-Pro-Ile-Val-Ala-Pro-Met-Glu-Tyr-Gly-Lys is TKPIVAPMEYGK. It represents the primary structure of the protein which dictates its properties and function.
Step-by-step explanation:
To write the sequence of the peptide Thr-Lys-Pro-Ile-Val-Ala-Pro-Met-Glu-Tyr-Gly-Lys using one-letter abbreviations, you refer to the standard abbreviations of these amino acids. The one-letter abbreviation for the peptide is as follows: T for Thr (threonine), K for Lys (lysine), P for Pro (proline), I for Ile (isoleucine), V for Val (valine), A for Ala (alanine), P for Pro (proline), M for Met (methionine), E for Glu (glutamate), Y for Tyr (tyrosine), G for Gly (glycine), and K for Lys (lysine). Thus, the sequence using one-letter abbreviations would be T-K-P-I-V-A-P-M-E-Y-G-K, written from the N-terminus to the C-terminus.
The primary structure of proteins is the linear sequence of amino acids bonded together by peptide bonds from the N-terminus to the C-terminus. Each amino acid is represented by a specific letter, making it simpler to refer to long chains of proteins. Understanding the primary structure is important, as it determines the protein's properties and function.