lecture03

lecture03 - 20.106J Systems Microbiology Lecture 3 Prof....

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20.106J – Systems Microbiology Lecture 3 Prof. DeLong ¾ Reading for today: Chapter 5 and Chapter 17 (533-555) ¾ Reading for next class: Chapter 6 – Microbial Growth ¾ For today: Bioenergetics and physiological diversity o Finish up chemotaxis o Basic modes of energy generation o Thermodynamics of growth o Diversity in energy acquisition ± Chemotaxis o Flagella rotate counterclockwise, driving the microbe forward ± When it switches to clockwise, the flagella all fly apart – change location – tumble ± To choose direction, they can’t really sense space, but over time they sense the concentration of particular chemicals They do this with receptors on their surface Che A auto phosphorylates Che Y to cause motor to drive, in the presence of the right concentration As the concentration rises over time, the cell makes a net motion along the concentration gradient This is a complex feedback mechanism A fully methylated receptor is not able to respond to an attractant Read Chapter 8.13 in the text to understand this
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This note was uploaded on 11/11/2011 for the course BIO 20.010j taught by Professor Lindagriffith during the Spring '06 term at MIT.

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lecture03 - 20.106J Systems Microbiology Lecture 3 Prof....

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