Biochem3 - Proteins Most abundant class of macromolecules...

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Proteins Most abundant class of macromolecules 50% of dry weight of cells Most versatile macromolecules in the cell in terms of number of functions performed •serve as catalysts (enzymes) •determine cell shape (structural proteins) •hormones (insulin, growth hormone, etc) •transport molecules (hemoglobin, mem. channels, etc) •defense molecules (antibodies) •mechanical work (muscle contraction) How can proteins do so many different things? Structure determines Function so, if proteins can serve so many different functions, they must be able to form many different structures! How do they do that? 1. Proteins are long chains of 10 to thousands of amino acids in length 2. There are 20 different kinds of amino acids What are the 20 different amino acids? all amino acids have same basic structure each with a unique feature called “R” Generic Amino Acid Structure H H O N C C H R O H Table 3-2 Twenty amino acids
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Table 3-2 Twenty amino acids Again, the reason so many structures are possible is:
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This note was uploaded on 10/08/2010 for the course MCDB MCDB 1A taught by Professor Senghuilow during the Summer '09 term at UCSB.

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Biochem3 - Proteins Most abundant class of macromolecules...

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