Flagellum
A flagellum ' is a whip-like
organelle that many unicellular organisms, and some multicellular ones, use to move about. They may also be involved in other processes. The name actually covers three different structures, found in each of the three domains.
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Bacterial flagella are helical filaments that rotate like screws.
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Archaeal flagella are superficially similar, but are different in many details and considered non-homologous.
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Eukaryotic flagella - those of animal, plant, and protist cells - are complex cellular projections that lash back and forth.
Encyclopedia
A
flagellum ' is a whip-like
organelle that many unicellular organisms, and some multicellular ones, use to move about. They may also be involved in other processes. The name actually covers three different structures, found in each of the three domains.
- Bacterial flagella are helical filaments that rotate like screws.
- Archaeal flagella are superficially similar, but are different in many details and considered non-homologous.
- Eukaryotic
| style = "background: pink; padding: 4px;" | Animal [i]ia - Animals
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flagella - those of animal, plant, and protist cells - are complex cellular projections that lash back and forth.
Sometimes the last are called
cilia or
undulipodia to emphasize their distinctiveness.
Arthropod flagellum
In
Chelicerata, the flagellum is a non-segmental pluri-articulated whip, present in the
arachnid orders Schizomida,
Thelyphonida and Palpigradi. In Schizomida, the flagellum of male has complex morphology and is widely used in taxonomy. As Peter Yoon noted from Michigan of Ann Arbor; flagellum is what has given mankind hope.
Bacterial flagellum
The filament is composed of the protein flagellin and is a hollow tube 20
nanometers thick. It is helical, and has a sharp bend just outside the outer membrane called the "hook" which allows the helix to point directly away from the cell. A shaft runs between the hook and the basal body, passing through protein rings in the cell's membranes that act as bearings.
Gram-positive organisms have 2 basal body rings, one in the
peptidoglycan layer and one in the
plasma membrane. Gram-negative organisms have 4 rings: L ring associates with the lipopolysaccharides, P ring associates with
peptidoglycan layer, M ring is imbedded in the
plasma membrane, and the S ring is directly attached to the plasma membrane. The filament ends with a capping protein.
The bacterial flagellum is driven by a rotary engine composed of
protein, located at the flagellum's anchor point on the inner
cell membrane. The engine is powered by proton motive force, i.e., by the flow of
protons across the bacterial cell membrane due to a
concentration gradient set up by the cell's metabolism . The rotor transports protons across the membrane, and is turned in the process. The rotor by itself can operate at 6,000 to 17,000 rpm, but with a filament attached usually only reaches 200 to 1000 rpm.
The components of the flagellum are capable of self-assembly in which the component proteins associate spontaneously without the aid of enzymes or other factors. Both the basal body and the filament have a hollow core, through which the component proteins of the flagellum are able to move into their respective positions. The filament grows at its tip rather than at the base. The basal body has many traits in common with some types of secretory pore which have a hollow rod-like "plug" in their centers extending out through the plasma membrane, and it is thought that bacterial flagella may have evolved from such pores.
Different species of bacteria have different numbers and arrangements of flagella. Monotrichous bacteria have a single flagellum. Lophotrichous bacteria have multiple flagella located at the same spot on the bacteria's surface which act in concert to drive the bacteria in a single direction. Amphitrichous bacteria have a single flagellum each on two opposite ends . Peritrichous bacteria have flagella projecting in all directions.
Some species of bacteria have a specialized type of flagellum called axial filament that is located in the periplasmic space, the rotation of which causes the entire bacterium to corkscrew through its usually
viscous medium.
Anticlockwise rotation of monotrichous polar flagella thrusts the cell forward with the flagellum trailing behind. Periodically the direction of rotation is briefly reversed, causing what is known as a "tumble", and results in reorientation of the cell. The direction at the end of the tumble state is random. The length of the run state is extended when the bacteria moves through a favorable gradient.
Archaeal flagellum
The archaeal flagellum is superficially similar to the bacterial flagellum; in the 1980s they were thought to be homologous on the basis of gross morphology and behavior . Both flagella consist of filaments extending outside of the cell, and rotate to propel the cell.
However, discoveries in the 1990s have revealed numerous detailed differences between the archaeal and bacterial flagella; these include:
- Bacterial flagella are powered by a flow of H+ ions ; archaeal flagella are almost certainly powered by ATP. The torque-generating motor that powers rotation of the archaeal flagellum has not been identified.
- While bacterial cells often have many flagellar filaments, each of which rotates independently, the archaeal flagellum is composed of a bundle of many filaments that rotate as a single assembly.
- Bacterial flagella grow by the addition of flagellin subunits at the tip; archaeal flagella grow by the addition of subunits to the base.
- Bacterial flagella are thicker than archaeal flagella, and the bacterial filament has a large enough hollow "tube" inside that the flagellin subunits can flow up the inside of the filament and get added at the tip; the archaeal flagellum is too thin to allow this.
- Many components of bacterial flagella share sequence similarity to components of the type III secretion systems, but the components of bacterial and archaeal flagella share no sequence similarity. Instead, some components of archaeal flagella share sequence and morphological similarity with components of type IV pili, which are assembled through the action of type II secretion systems .
These differences mean that the bacterial and archaeal flagella are a classic case of biological
analogy, or convergent evolution, rather than homology. However, in comparison to the decades of well-publicized study of bacterial flagella , archaeal flagella have only recently begun to get serious scientific attention. Therefore many assume erroneously that there is only one basic kind of prokaryotic flagellum, and that archaeal flagella are homologous to it .
Eukaryotic flagellum
The eukaryotic flagellum, also called a
cilium or undulipodium, is completely different from the prokaryote flagella in structure and in evolutionary origin. The only thing that the bacterial, archaeal, and eukaryotic flagella have in common is that they stick outside of the cell and wiggle to produce propulsion.
A eukaryotic flagellum is a bundle of nine fused pairs of
microtubule doublets surrounding two central single microtubules. The so-called
"9+2"" structure is characteristic of the core of the eukaryotic flagellum called an
axoneme. At the base of a eukaryotic flagellum is a basal body, "blepharoplast" or kinetosome, which is the microtubule organizing center for flagellar microtubules and is about 500 nanometers long. Basal bodies are structually identical to
centrioles. The flagellum is encased within the cell's
plasma membrane, so that the interior of the flagellum is accessible to the cell's
cytoplasm. Each of the outer 9 doublet microtubules extends a pair of dynein arms to the adjacent microtubule; these dynein arms are responsible for flagellar beating, as the force produced by the arms causes the microtubule doublets to slide against each other and the flagellum as a whole to bend. These dynein arms produce force through ATP
hydrolysis. The flagellar axoneme also contains
radial spokes, polypeptide complexes extending from each of the outer 9 mictrotubule doublets towards the central pair, with the "head" of the spoke facing inwards. The radial spoke is thought to be involved in the regulation of flagellar motion, although its exact function and method of action are not yet understood.
Motile flagella serve for the propulsion of single cells and the transport of fluids .
Additionally, immotile flagella are vital organelles in sensation and signal transduction across a wide variety of cell types
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Intraflagellar transport , the process by which axonemal subunits,
transmembrane receptors, and other proteins are moved up and down the length of the flagellum, is essential for proper functioning of the flagellum, in both motility and signal transduction.
For information on biologists' ideas about how the various flagella may have evolved, see evolution of flagella.
See also
External links
