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CW34-PS - CHM 2046/Myers WORKSHEET 34 PROTEIN STRUCTURE...

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CHM 2046/Myers WORKSHEET 34 APR 12, 2010 PROTEIN STRUCTURE Proteins are large polypeptides that have some biological activity. Some have multiple peptide “chains” and there can be other groups not composed of amino acids. See text p 497 Figure 15.21 and p 498 Figure 15.22. 1. Primary Structure . This is the sequence of amino acids in a polypeptide or protein chain. The bonding associated with primary structure is the covalent amide condensation linkages , also known as “peptide bonds.” 2. Secondary Structure . This is the arrangement or “conformation” of the chain. This is due to hydrogen bonding as N-H … O-C between groups on the main backbone of the chain (not the R groups). There are several types of conformation: An α -helix is a single stranded right handed helix , much like the threads of a machined bolt. There are 3.6 amino acid units for each complete turn of the helix. This number of units per turn allows the N-H and O-C units to line up. That amino acids are all L isomers is believed to be related to α -helices being right handed. If there is another planet out there somewhere with life as we know, might it possibly be based on d-amino acids and left handed helices? Did we evolve our way randomly?
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