Axonema
Nákres eukaryotního bičíku: (1) axonema (2) cytoplazmatická membrána (3) intraflagelární transport (4) bazální tělísko (5) průřez bičíkem (6) trojice mikrotubulů z bazálního tělíska
Axonema je svazek mikrotubulů uvnitř bičíků a řasinek eukaryotních organismů.[1] Obvykle se skládá z jednoho centrálního páru mikrotubulů a devíti dalších párů uspořádaných v kruhu kolem něho (9×2+2). Axonemy fungují primárně jako organizační centrum pohybu bičíku.[2]
Průřez axonemou
Reference
- ↑ Stenesh, J. (1989): Dictionary of Biochemistry and Molecular Biology (2nd Edition). John Wiley & Sons.
- ↑ PORTER, Mary E., Winfield S. Sale. The 9 + 2 Axoneme Anchors Multiple Inner Arm Dyneins and a Network of Kinases and Phosphatases that Control Motility. J. Cell Biol.. 2000-11-20, roč. 151, čís. 5, s. 37F-42. Dostupné online [cit. 2008-09-14]. DOI 10.1083/jcb.151.5.F37.
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Chlamydomonas TEM 17.jpg
Transmission electron microscope image, showing an example of green algae (Chlorophyta).
Chlamydomonas reinhardtii is a unicellular flagellate used as a model system in molecular genetics work and flagellar motility studies.
This image is a thin x-section cut through the isolated axoneme. Chlamydomonas flagella have the "9+2" structure characteristic of all eukaryotic cells. The axoneme has a central unit containing two single microtubules and nine peripheral doublet microtubules (known as the "9+2"). Dynein sidearms project from the A tubule of each doublet. Also visible in this image are the radial spokes and the inner sheath.
Transmission electron microscope image, showing an example of green algae (Chlorophyta).
Chlamydomonas reinhardtii is a unicellular flagellate used as a model system in molecular genetics work and flagellar motility studies.
This image is a thin x-section cut through the isolated axoneme. Chlamydomonas flagella have the "9+2" structure characteristic of all eukaryotic cells. The axoneme has a central unit containing two single microtubules and nine peripheral doublet microtubules (known as the "9+2"). Dynein sidearms project from the A tubule of each doublet. Also visible in this image are the radial spokes and the inner sheath.
Eukarya Flagella.svg
Autor: Franciscosp2, Licence: CC BY-SA 3.0
Eukaryotic flagella. 1-axoneme, 2-cell membrane, 3-IFT (IntraFlagellar Transport), 4-Basal body, 5-Cross section of flagella, 6-Triplets of microtubules of basal body.
Autor: Franciscosp2, Licence: CC BY-SA 3.0
Eukaryotic flagella. 1-axoneme, 2-cell membrane, 3-IFT (IntraFlagellar Transport), 4-Basal body, 5-Cross section of flagella, 6-Triplets of microtubules of basal body.