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lecture3_9_9_08 - Lecture 3 Chapter 2 Stryer amino...

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Lecture 3 • amino acids -structure -stereochemistry -acid/base properties • peptides -structure -biological activities • proteins -structure Chapter 2: Stryer human insulin: a protein hormone crucial for maintaining appropriate blood sugar level Proteins • Proteins are linear polymers built of monomer units called amino acids. They fold into three-dimensional structures that are important for their functions. • Proteins contain a wide range of functional groups. These groups are chemically reactive and can participate in numerous types of interactions. • Proteins can interact with one another and other biological molecules to form complex assemblies. • Some proteins are rigid, whereas others display a considerable degree of flexibility. This degree of flexibility is often related to their biological roles. A protein component of the DNA replication machinery: the two clamps (subunits) surround the DNA. The protein lactoferrin: undergoes a substantial conformational change upon metal (Fe) binding.
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amino acid structure "side chain" " ! carbon" * known as an ! -amino acid , due to the location of the amino group on the ! carbon ( ! to the carbonyl) The standard (DNA-encoded) amino acids found in proteins possess the L stereochemistry. D -amino acids are produced in certain organisms, but are not found in their proteins.
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