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Questions and Answers
What is the only constant feature of the tetrapéptido composition across bacterial species?
What is the only constant feature of the tetrapéptido composition across bacterial species?
- Presence of lysine
- Presence of D-alanine in the fourth position (correct)
- Presence of dextro amino acids
- Presence of diamino acid
What type of amino acids are uniquely present in the tetrapéptido of PG?
What type of amino acids are uniquely present in the tetrapéptido of PG?
- Levógiro amino acids
- Beta amino acids
- Homochiral amino acids
- Dextro amino acids (correct)
Which component is unique to prokaryotic organisms and serves as a precursor to lysine biosynthesis?
Which component is unique to prokaryotic organisms and serves as a precursor to lysine biosynthesis?
- Amino acid in position 2
- DAP (Diaminopimelic acid) (correct)
- D-alanine
- Lysine itself
What role do specialized enzymes play in the synthesis of PG?
What role do specialized enzymes play in the synthesis of PG?
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How can a covalent bond form between adjacent tetrapéptido chains of PG?
How can a covalent bond form between adjacent tetrapéptido chains of PG?
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Study Notes
Tetrapéptido Composition
- The structure of the tetrapéptido varies among different bacterial species.
- However, D-alanine consistently occupies the fourth position.
- This presence of D-alanine is unusual, as proteins normally incorporate L-amino acids.
- Diaminopimelic acid (DAP) is a unique component of prokaryotes that serves as a precursor to lysine biosynthesis.
- Unlike typical protein synthesis, PG synthesis does not rely on genetic messages or ribosomes.
- Specialized enzymes control the order of amino acid incorporation.
- Covalent bonds between adjacent tetrapéptido chains can occur directly or through mediating amino acids.
- These bonds typically form between the terminal D-alanine of one tetrapéptido and either the third or second amino acid of another.
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