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Lecture 2

BIO 152 Lecture Notes - Lecture 2: Negative Feedback, Enzyme, Activation Energy

Course Code
BIO 152
Seth Jones

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January, 18th
BIO 152 – Lecture 2 – Proteins and Enzymes
Proteins made of Amino Acid
Chains of amino acids
oLinked by peptide bond
o20+ different side chains on amino acids
oChain can be hundreds of amino acids long
Order of amino acids (primary structure) is important
oCreates the folded 3 dimensional structure of protein
How are amino acids put together?
oCondensation reaction
Proteins three dimensional shape allow it to perform roles
oTertiary structure allows proteins to bind to things
oMany roles
Proteins and Lipids
Proteins are strings of amino acids
oSome amino acids side chains are polar; some amino acids are nonpolar
Proteins and other macromolecules will fold or arrange themselves so that the polar
regions are facing water and the nonpolar regions are facing other nonpolar regions
Proteins that are embedded in nonpolar membranes will have polar sections and non-
polar sections inside the membrane
Proteins and Enzymes
Most enzymes are proteins
oException: ribosome and similar RNA based enzymes
Important things to remember about proteins
oBig molecules made up of amino acids
oAmino acids have different properties: charges, hydrophobic, etc.
oHave a 3-D shape held together by ionic bonds, covalent bonds, hydrogen bonds
and other forces
oShape of protein allows it do its job
oProteins bind to things
What you need to know about enzymes
oWhat is the general structure of an enzyme?
Active site – binding
Allosteric sites
oHow do enzymes work?
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