write the structural formula for the dipeptide formed when the carboxyl end of cysteine bonds to the amino end of valine
To write the structural formula for the dipeptide formed when the carboxyl end of cysteine bonds to the amino end of valine, it is important to understand the structures of these individual amino acids and the way they join together.
Step 1: Understand the structures of cysteine and valine.
Cysteine is an amino acid that contains an amino group (-NH2), a carboxyl group (-COOH), and a side chain (-CH2SH) with a sulfur atom. Valine is also an amino acid characterized by an amino group (-NH2), a carboxyl group (-COOH), and a side chain (-CH(CH3)CH2CH3).
Step 2: Recognize the bond formation between cysteine and valine.
In peptide formation, the carboxyl group (-COOH) of one amino acid combines with the amino group (-NH2) of another amino acid, forming an amide bond (-CONH-). In this case, the carboxyl end of cysteine will bond with the amino end of valine.
Step 3: Write the structural formula for the dipeptide.
Based on the above information, the structural formula for the dipeptide formed when the carboxyl end of cysteine bonds to the amino end of valine can be represented as:
Cysteine (Cys) -COOH + Valine (Val) -NH2 --> Cys-Val
The sulfur atom in the side chain of cysteine (-CH2SH) is involved in forming a disulfide bond with another cysteine residue under certain conditions. However, for the dipeptide in question, we are focusing on the peptide bond between cysteine and valine.
Please note that the above representation is a simplified structural formula and does not consider the three-dimensional configuration of the molecules. For a more detailed and accurate representation, specific software or organic chemistry drawing tools may be required.