Difference between revisions of "Microtubule"

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[[Microtubule]]
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'''Definition'''
  
(Science: [[cell]] biology) [[cytoplasmic]] [[tubule]], 25nm [[outside]] [[diameter]] with a 5nm thick [[wall]]. Made of [[tubulin]] [[heterodimers]] packed in a three [[start]] [[helix]] (or of 13 [[protofilaments]] looked at another [[way]]) and [[associated]] with various other [[proteins]] ([[mAPs]], [[dynein]], [[kinesin]]). [[Microtubules]] of the [[ciliary]] [[axoneme]] are more [[permanent]] than [[cytoplasmic]] and [[spindle]] [[microtubules]].
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''noun, plural: microtubules''
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A [[cytoplasmic]] [[tubule]] made up of [[polymer]]s of alpha- and beta-[[tubulin]] [[dimer]]s. It is the structural component of [[cytoskeleton]], [[cilia]], and [[eukaryotic]] [[flagella]].
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'''Supplement'''
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Structure: a tubular structure with [[diameter]] of 25 nm, length range ranging from 200 nm to 25 micrometers, and wall thickness of 5 nm.
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Features: exhibits [[polarity]] and are organized by a [[microtubule organizing center]]s (e.g. [[centriole]]s and [[basal bodies]])
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Function: renders [[intracellular]] shape, and involved in [[locomotion]] and [[transport]].
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Location: [[cytoplasm]] of most [[cells]].
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''Word origin:'' Greek ''mīkrós '' (small)
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''Related form(s):''
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*[[microtubular]]
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*[[astral microtubule]]
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*[[Microtubule organising centre]]

Revision as of 21:15, 17 November 2010

Definition

noun, plural: microtubules

A cytoplasmic tubule made up of polymers of alpha- and beta-tubulin dimers. It is the structural component of cytoskeleton, cilia, and eukaryotic flagella.


Supplement

Structure: a tubular structure with diameter of 25 nm, length range ranging from 200 nm to 25 micrometers, and wall thickness of 5 nm.

Features: exhibits polarity and are organized by a microtubule organizing centers (e.g. centrioles and basal bodies)

Function: renders intracellular shape, and involved in locomotion and transport.

Location: cytoplasm of most cells.


Word origin: Greek mīkrós (small)

Related form(s):