Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Daniel Smith - Sanborn Regional High School Summer 2009 Workshop.

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Presentation transcript:

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Daniel Smith - Sanborn Regional High School Summer 2009 Workshop in Biology and Multimedia for High School Teachers

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Physiology of Flagella in Bacterial Movement Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College.

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Flagella - semi rigid structure used to move rod shaped microbial cells Rod shaped bacillus

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Structure Flagella composed of protein polymer Flagellin Attaches to cell membrane with Hooks and Basil Bodies at the Cell Membrane Flagella rotates like a screw using proton motor force

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Common Forms A- Monotrichous; One flagella at one cell Pole B- Lophotrichous; Multiple flagela at one cell pole Lophotrichous; C- Amphitrichous; One flagella at each cell pole Amphitrichous; D- Peritrichous; Several flagella at multiple locations on cell Peritrichous;

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Direction of movement Runs and Tumbles To move forward flagella rotates Counterclockwise propelling cell body with the tail following behind When flagella rotates Clockwise forward motion stops and cell tumbles

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Flagella helps cell interact with it’s Environment Bacteria behave or respond to their environment depending upon various stimuli such as chemicals, light or oxygen. Nutrients light O 2 Waste chemicals O 2 Run counter clockwise rotation Tumble clockwise rotation

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Behavior stimulus types Chemotaxis: Moving towards helpful chemicals such as nutrients or away from chemicals such as waste or harmful chemicals Phototaxis: Moving towards light Aerotaxis: Moving towards or away from Oxygen

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Receptor molecules near surface of membrane detect environmental conditions and transfer signals to flagella motor making it turn counter clockwise or clockwise. Turning speed can be influenced by concentration gradient. *Receptors may be related to transfer molecules Receptors

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Bacteria are relatively Fast OrganismSpeedBody lengths Cheetah111 km/hr25 Human37 km/hr5.4 Bacteria km/hr10

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Flagella are sophisticated structures that require the interaction of many different finely tuned systems that allows the organism to survive

Life Sciences-HHMI Outreach. Copyright 2009 President and Fellows of Harvard College. Resources: Microbiology: Tortolla P 83-85