User:Dhail/Protein filament
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[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Protein_filament.png/158px-Protein_filament.png)
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[edit]In biology, a protein filament is a "long chain of proteins, such as those found in hair, muscle, or in flagella." [[1]] Protein filaments form together to make the cytoskeleton of the cell. They are often bundled together to provide support, strength, and rigidity to the cell. When the filaments are packed up together, they are able to form three different cellular parts. These three cellular parts make up the cytoskeleton, where each structure has its own size and protein composition. The three cellular examples include:
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/89/Microfilaments.jpg/133px-Microfilaments.jpg)
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[edit]Microfilaments
[edit]Main article: Microfilaments
Compared to the other parts of the cytoskeletons, the microfilaments contain the thinnest filaments, with a diameter of approximately 7nm. Microfilaments are part of the cytoskeleton that are composed of protein called actin. Microfilaments can either occur in the monomeric G-actin or filamentous F-actin. [[2]]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7c/Microtubule.png/185px-Microtubule.png)
Microtubules
[edit]Main article: Microtubules
Microtubules are the largest type of filament, with a diameter of 25 nm wide, in the cytoskeleton. [[3]] A single microtubule consists of 13 linear microfilaments. Unlike microfilaments, microtubules are composed of a protein called tubulin. The tubulin consists of dimers, named either "αβ-tubulin" or "tubulin dimers", which polymerize to form the microtubules. [[3]]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Intermediate_filament.png/194px-Intermediate_filament.png)
Intermediate filaments
[edit]Main article: Intermediate filaments
Intermediate filaments are part of the cytoskeleton structure found in most eukaryotic cells. Intermediate filaments contain an average diameter of 10 nm, which is small than that of microtubules, but larger than that of microfilaments. [[4]]
References
[edit]- ^ "UCMP Glossary: Cell biology". ucmp.berkeley.edu. Retrieved 2021-11-05.
- ^ Hohmann, Tim; Dehghani, Faramarz (2019-04-18). "The Cytoskeleton—A Complex Interacting Meshwork". Cells. 8 (4): 362. doi:10.3390/cells8040362. ISSN 2073-4409. PMC 6523135. PMID 31003495.
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: CS1 maint: unflagged free DOI (link) - ^ a b Goodson, Holly V.; Jonasson, Erin M. (2018-06-01). "Microtubules and Microtubule-Associated Proteins". Cold Spring Harbor Perspectives in Biology. 10 (6): a022608. doi:10.1101/cshperspect.a022608. ISSN 1943-0264. PMC 5983186. PMID 29858272.
{{cite journal}}
: CS1 maint: PMC format (link) - ^ Herrmann, Harald; Aebi, Ueli (2016-11-01). "Intermediate Filaments: Structure and Assembly". Cold Spring Harbor Perspectives in Biology. 8 (11): a018242. doi:10.1101/cshperspect.a018242. ISSN 1943-0264. PMID 27803112.