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The fundamental building blocks of proteins, amino acids, link together through a specific type of chemical linkage known as a peptide bond. Understanding how is a peptide bond formed between two amino acids is crucial to comprehending protein structure and function. This process is primarily achieved through a dehydration-condensation reaction, also referred to as dehydration synthesis.

During this reaction, the carboxyl group (COOH) of one amino acid interacts with the amino group (NH2) of another amino acid. Specifically, the hydroxyl (-OH) portion of the carboxyl group and a hydrogen atom (-H) from the amino group are removed, forming a molecule of water (H₂O). This removal of water is the "dehydration" aspect of the process. The remaining atoms then form a strong covalent bond, the peptide bond, between the two amino acids. This linkage is an amide linkage between the nitrogen of the amino group and the carbonyl carbon of the carboxyl group, represented as –CO–NH–.

This reaction can occur between two consecutive alpha-amino acids or two amino acids in general. When two amino acids bind through a process called dehydration synthesis, a peptide bond is formed. This results in the creation of a dipeptide, which is a molecule composed of two amino acids linked by a single peptide bond. The peptide bond is essentially an amide bond formed by the condensation reaction between 2 amino acid molecules.

The formation of a peptide bond can be visualized as follows: one amino acid contributes its carboxyl group, and the other contributes its amino group. The peptide bond is formed by the linking of the carboxyl group of one amino acid with the amino group of another. The peptide bond forms between the carboxyl end of one amino acid and the amino end of another. This process also leaves a free amino group on one end of the newly formed peptide chain and a free carboxyl group on the other end, allowing for further elongation of the chain.

The peptide bond formation mechanism is a vital step in protein synthesis. While the direct reaction between two amino acids can occur, in biological systems, this process is facilitated by ribosomes. The formation of peptide bonds is a fundamental step in building the complex polypeptide chains that fold into functional proteins.

In essence, the answer to how is a peptide bond formed between two amino acids lies in the dehydration synthesis process where a water molecule is released as the carboxyl group (COOH) of one amino acid reacts with the amino group (NH2) of another. This results in a stable peptide bond that links the amino acids together, forming the foundation for all proteins. The peptide bonds are formed between the alpha-carboxyl group of one amino acid and the alpha-amino group of another, resulting from this dehydration reaction.