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Proteins

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by

Mark Van Arsdale

on 21 September 2016

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Transcript of Proteins

Proteins
CLASSIFICATION is based on properties of side chain
H+ has been donated to solution
H+ has been removed from solution
O present, sometimes S
Formation of peptide bonds uses dehydration synthesis, in amino acids it connects the amino group of one to carboxyl of another
Amino Acid Structure
Denaturation changes a protein’s shape which in turn changes its activity
No O present in side groups, lots of methyl, lots of rings
Sequence of amino acids, as determined by the genes
Regular repeated folding of peptide chains, stabilized by H bonding
Irregular contortions, stabilized by H bonds,ionic bonds, hydrophobic interactions, and disulfide bridges
Interaction of several polypeptide chains
http://www.sumanasinc.com/webcontent/animations/content/proteinstructure.html
General Characteristics
Polymers of amino acids
Each has unique 3-D shape based on a unique sequence of amino acids
Each varies in its sequence of amino acids
They are the building blocks of enzymes, contractile proteins, structural proteins, and receptor proteins
Polar
Non-polar
Acidic
Basic
Sequence Determines Structure
How does it happen?
High temperature
Change in pH

Organic solvent
Full transcript