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AMPHITRICHOUS MOVEMENT

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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AMPHITRICHOUS MOVEMENT

Postby Elersong » Wed Oct 29, 2008 7:55 pm

My micro professor has been really ticking me off this year about a certain question I got wrong on a test earlier this year. The question seemed simple enough : Describe the method of movement of an amphitrichous bacterium. For THREE MONTHS NOW, I have asked and researched and begged and pleaded, but I can't find the answer. AND HE REFUSES TO TELL ME, saying that I am looking too deep into the question.

The flagellum is activated and inactivated by the binding of a certain substrate to a certain protein that activates this and then relays that and ultimately signals which way the flagellum should turn, resulting in either forward movement or change in direction. Theoretically, because the flagella at both ends are on the same bacteria and therefore in approximately the same region of whatever solution the bacterium is in, should they not receive the same signals from the same molecules and therefore spin in the same direction resulting in zero net movement?

OBVIOUSLY NOT because they DO move... BUT HOW?
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Postby victor » Tue Nov 04, 2008 2:11 pm

I can think it's probably by the direction of flagellar spin. Bacteria move by 'spinning' their flagella and thus the arrangement of flagellin helices which construct flagella is in certain direction (either right spin or left spin).
So, I can say that if the forward movement of bacteria is caused by right spin of a right-spin flagellin helices and vice versa, then the bacteria can reach certain objects by doing a opposite spinning of their amphitrichous flagella (right spin on the back and left spin on the front).

But it's still only lucky guessing though :lol:
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Postby canalon » Wed Nov 05, 2008 5:36 pm

Only one flagellum works at any moment...
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Postby Elersong » Mon Nov 10, 2008 1:28 am

LOL. The answer is so simple... kinda ticks me off...

But thanks... uuuuggghhhh...
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