BIOCHEM 2EE3 Lecture Notes - Lecture 4: Epitope, Monomer, Antigen
30 Jan 2017
School
Department
Course
Professor
Document Summary
Alpha-helices and beta-sheets from adjacent chains in gure 6. 4: helical structures are formed by a single polypeptide chain and sheet structures are made, pauling and his associates discovered right handed a helix and b sheets. Most commonly observed secondary structures: figure 6. 4 shows 310helix which is in some proteins but not as common as a helix, all the secondary protein structures in fig. 6. 4 satisfy the criteria that was explained before: 6. 4(b) the b-sheet is antiparallel because the two b-strands arranged such that the n-terminus to c-terminus orientations of the two strands are opposite! B-sheets are made of two or more b-strands with the main chain h-bonds in between the adjacent b strands. Left-handed coiled -coil structure: pairing occurs due to amino acid sequence of the a-keratin surface area exists along one face of each helical chain. Every 3rd or 4th aa has a nonpolar, hydrophobic side chain.
