Protein Structure I: Properties of Peptide bond, Ramachandran plot, Primary and secondary (alfa-helix, beta-pleated sheet, turns and loops) structures
Protein Structure I: Properties of Peptide bond, Ramachandran plot, Primary and secondary (alfa-helix, beta-pleated sheet, turns and loops) structures
Proteins and peptides
- Proteins and peptides are polymer of L-amino acids joined together with peptide bonds
- Peptide bond is an amide linkage between the α-amino group of one amino acid and the α-carboxyl group of another, with the elimination of the elements of water.
- Peptide bond formation is an example of a condensation reaction
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- In a peptide, the amino acid residue at the end with a free -amino group is the amino-terminal (or N-terminal) residue.
- The residue at the other end, which has a free carboxyl group, is the carboxyl-terminal (C-terminal) residue.
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Proteins possessed four levels of structural organization
- Primary Structure
- Secondary structures
- α-helix
- β-pleated sheets;
- turns and loops
- Tertiary Structure
- Quaternary Structure
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I have been meaning to write something like this on my site and this has given me an idea. Cheers.