10_Proteins-1

10_Proteins-1 - X X X . . . P P P r r r o o o t t t e e e i...

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Unformatted text preview: X X X . . . P P P r r r o o o t t t e e e i i i n n n s s s This last group of biomolecules accounts for 50% of the dry weight of living organisms, so it must be of considerable significance. F F F u u u n n n c c c t t t i i i o o o n n n o o o f f f p p p r r r o o o t t t e e e i i i n n n s s s structure: hair, fingernails. transport: hemoglobin. information: protein hormones. catalysis: enzymes. locomotion: muscles. S S S t t t r r r u u u c c c t t t u u u r r r e e e o o o f f f p p p r r r o o o t t t e e e i i i n n n s s s The building blocks for proteins are amino acids. Polymers of amino acids form polypeptide chains, which then coil and often are assembled into multi-subunit complexes. A A A m m m i i i n n n o o o a a a c c c i i i d d d s s s C O N + H R 1 CH O- H carbon R-group Carboxyl end Amino end H A common feature of amino acids is the central carbon ( carbon) with an amine, a carboxylic group, and a hydrogen attached to it. The fourth residue can be any of a variety of so called R groups. In water, amino acids are charged; they have a positive charge on the amino end and a negative charge on the carboxyl. R R R g g g r r r o o o u u u p p p s s s Glycine Alanine Serine Cysteine Aspartic acid Asparagine H CH 3 CH 2 OH CH 2 SH CH 2 COOH CH 2 C O NH 2 There are 20 naturally occurring R groups with varying degrees of polarity and acidity....
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10_Proteins-1 - X X X . . . P P P r r r o o o t t t e e e i...

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