protein structure (part 1)
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Protein Structure (Part 1)
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Proteins are heteropolymers
• hetero – (from Greek) other, another different • polymer – a molecule consis=ng of repea=ng units
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20 Naturally occurring amino acids
• differ in the nature of their “sidechains”
• these proper=es, and the sequence in which they occur determine the “shape” of the protein
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Protein Structure Heirarchy
…AGARTWLYLIPDNLDK… Primary structure
Secondary structure α helix β sheet
Ter=ary structure
Quaternary structure Increasing Com
plexity
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Helices and Sheets
Repea=ng units of secondary structure that allow for regular networks of hydrogen bonds between backbone atoms.
Go to Protein Structure Worksheet and get some hands-‐on experience looking at protein structures!
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Protein Structure Links
• PDB (Protein Data Bank): – hZp://www.pdb.org
• SCOP (Structural Classifica=on of Proteins) – hZp://scop.mrc-‐lmb.cam.ac.uk/scop/
• CATH (Protein Structure Classifica=on Database) – hZp://www.cathdb.info/