Active Methionine: The Key Player In Transmethylation Reactions

Active Methionine: The Key Player In Transmethylation Reactions

Question 1. Active Methionine.
Answer:

Active Methionine Formation:

• Methionine is activated by ATP in the presence of the enzyme methionine-adenosyl transferase.
• Methionine + ATP → active methionine.

Active Methionine Structure:

• The s-methyl bond is a high-energy bond.
• The Methyl group is liable and gets readily transferred to an acceptor during transmethylation reactions.

Question 2. Essential amino acids and their functions.
Answer:

The amino acids which cannot be synthesized in the body and need to be supplied through diet are known as essential amino acids.

Question 3. Primary Structure of Proteins.
Answer:

• The linear sequence of amino acids forming the backbone of proteins is referred to as the primary structure.
• Amino acids are held together by peptide bonds.
• This bond is formed between the amino groups of one
  amino acid and the carboxyl group of another amino acid.
• The sequence of amino acids is determined by genes in DNA.

Primary Structure of Proteins Determination:

• It involves 3 stages.

1. Determination of amino acid composition.
2. Degradation of proteins.
3. Determination of the amino acid sequence.

Question 4. Classification of proteins.
Answer: