In class notes for September 14, 2007

In class notes for September 14, 2007 - Introduction to...

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Introduction to Biological Science 110a In class notes for September 14, 2007 Cis conformation (see notes from 9/12/2007) Animal membranes contain a steroid called Cholesterol Needs a way to transfer molecules from one side of the membrane to the other o Carried out by membrane proteins Next week on Tuesday and Friday there will be help sessions from 4:10-5:00 in the lecture hall Test is during class time Membrane proteins o Could be the window of the house o Or the telephone o Membranes are a sea of lipids with proteins in the sea o Three different types of proteins Integral Peripheral Lipid anchor Doesn’t know if it is integral or peripheral o Integral Embedded in membrane Because they go across the membrane they are called transmembrane proteins Every protein in a membrane goes completely across Proteins are so embedded they are extremely difficult to remove They can be removed with detergents or organic solvents Means you have to dissolve away the membrane Integral proteins are amphipathic
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Introduction to Biological Science 110a In class notes for September 14, 2007 Hydrophilic side sticks out on each side Its hard to remove protein without destroying it How can a protein chain get across the membrane? o Peptide bonds are ALWAYS hydrophilic o Two types of transmembrane structures Alpha helical structure Could be one or many Prothetic groups are yellow on slide Photosynthetic groups in particular have a lot of prosthetic groups. Beta barrels
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In class notes for September 14, 2007 - Introduction to...

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