Qhov sib txawv tseem ceeb ntawm microtubules thiab microfilaments yog tubulin yog cov protein uas ua rau microtubules thaum actin yog cov protein uas ua rau microfilaments. Tsis tas li ntawd, microtubules yog cov qauv zoo li lub raj ntev ntev thaum microfilaments yog cov kab polymers ntawm globular protein actin.
Protein fibers yog qhov tseem ceeb rau kev ua haujlwm ntau hauv cov hlwb. Microtubules thiab microfilaments yog ob hom fibers uas tshwm sim hauv cytoplasm ntawm txhua eukaryotic cell. Cov fibers no yog lub luag haujlwm tseem ceeb rau kev ua cov kev sib txuas sib txuas uas hu ua 'cytoskeleton' ntawm cytoplasm. Lub cytoskeleton yog lub cev muaj zog uas pab tswj cov duab ntawm cov cell thiab thauj cov cell organelles hauv cytoplasm. Sib nrug los ntawm cov lus hais saum toj no ob hom fibers, nruab nrab fibers kuj tseem ceeb hauv kev ua cov cytoskeleton. Qee cov fibers kuj ua rau cov txheej txheem locomotion (flagella, cilia, thiab lwm yam), uas feem ntau muaj nyob rau hauv qee yam prokaryotes.
Microtubules yog dab tsi?
Microtubules ntev, hollow cylindrical qauv tsim los ntawm globular proteins uas muaj dimers ntawm α- thiab β-tubulin subunits teem ib sab nyob ib ncig ntawm ib tug tseem ceeb. Lawv yog cov ntsiab lus loj tshaj plaws ntawm cytoskeleton. Txhua lub raj muaj txoj kab uas hla ntawm 25 nm, thiab muaj ib lub nplhaib ntawm 13 protein protofilaments. Txhua qhov protofilament tsim los ntawm α- thiab β-tubulin globular protein subunits los ntawm cov txheej txheem polymerization. Cov haujlwm ntawm microtubules yog tswj hwm kev thauj mus los hauv lub cev, kev sib cais ntawm cov chromosomes thaum lub sij hawm mitosis, txav ntawm flagella thiab cilia, thiab qhov chaw ntawm cellulose molecules thaum lub sij hawm cell phab ntsa synthesis nyob rau hauv cov nroj tsuag.
Daim duab 01: Microtubules
Nyob hauv ntau lub hlwb, kev tsim ntawm microtubules pib los ntawm qhov chaw ntawm lub xovtooj thiab radiates mus rau qhov chaw. Qhov kawg ntawm qhov nruab nrab yog ntxiv (+) xaus thaum xaus ntawm qhov chaw yog rho tawm (-) xaus. Microtubules muaj qhov tsis tu ncua ntawm kev txuas ntxiv polymerization thiab depolymerization; yog li ntawd, lawv muaj ib nrab neej luv luv ntawm 20 vib nas this mus rau 10 feeb.
Microfilaments yog dab tsi?
Microfilaments yog cov fibers thinnest hauv cytoskeleton. Lawv yog ua los ntawm globular actin protein subunits. Txhua lub filament muaj ob txoj hlua proteins xoob sib tw ua ke. Txhua lub saw yog ua los ntawm 'pearl' zoo li globular protein subunits. Lub cheeb ntawm microfilament yog hais txog 7 nm. Ntxiv mus, microfilaments muaj polarity, yog li lawv muaj ntxiv (+) thiab rho tawm (-) xaus thiab lawv sawv cev rau kev loj hlob & kev taw qhia ntawm microfilaments.
Daim duab 02: Microfilaments
Ntxiv rau kev ua cov cytoskeleton, qee qhov microfilaments kuj ua lub luag haujlwm hauv kev cog lus ntawm tes. Cov filaments feem ntau muaj nyob hauv cov pob hauv qab ntawm cov plasma membrane. Peb hu cov microtubules 'stress fibers' hauv ib lub cell.
Dab tsi yog qhov zoo sib xws ntawm Microtubules thiab Microfilaments?
- Ob lub microtubules thiab microfilaments yog fibers ntawm cytoskeleton ntawm eukaryotic hlwb.
- Lawv fibers ntev.
- Tsis tas li ntawd, lawv yog cov polymers.
- Kuj, ob leeg tuaj yeem yaj thiab hloov kho sai sai.
Qhov txawv ntawm Microtubules thiab Microfilaments yog dab tsi?
Microtubules yog cov raj ntev ntev zoo li cov qauv tsim los ntawm tubulin protein. Ntawm qhov tod tes, microfilaments yog linear polymers ntawm globular protein actin. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm microtubules thiab microfilaments. Thaum txiav txim siab lawv qhov ntau thiab tsawg, microtubules yog cov fibers loj tshaj plaws thaum microfilaments yog cov fibers thinnest tam sim no hauv cytoskeleton. Yog li, qhov loj me yog qhov sib txawv ntawm microtubules thiab microfilaments.
Tsis tas li ntawd, 13 cov ntaub ntawv pov thawj yog arrayed ib sab nyob ib ncig ntawm lub hauv paus tseem ceeb los tsim cov microtubules thaum ob txoj hlua actin yog twisted los tsim microfilaments. Yog li, qhov no yog qhov sib txawv ntawm microtubules thiab microfilaments. Tsis tas li ntawd, microtubules tawv dua li microfilaments. Tsis tas li ntawd, lawv pab tsim centriole, tsis zoo li microfilaments. Yog li, qhov no yog lwm qhov sib txawv ntawm microtubules thiab microfilaments.
Cov hauv qab no nthuav tawm cov ntsiab lus ntxiv ntawm qhov sib txawv ntawm microtubules thiab microfilaments piv.
Summary – Microtubules vs Microfilaments
Microtubules thiab microfilaments yog ob hom fibers ntev uas ua rau cytoskeleton. Microtubules yog ntev hollow cylindrical lug ua los ntawm dimers ntawm α- thiab β-tubulin subunits teem ib sab ntawm ib sab ntawm ib tug tub ntxhais. Ntawm qhov tod tes, microfilaments yog cov thinnest fibers ua los ntawm ob intertwined actin strands. Microtubules muaj txoj kab uas hla loj dua microfilaments. Yog li ntawd, microtubules yog cov khoom loj tshaj plaws thaum microfilaments yog qhov thinnest tivthaiv ntawm cytoskeleton. Tsis tas li ntawd, microtubules tawv dua li microfilaments. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm microtubules thiab microfilaments.
