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Vimentin

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VIM
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesVIM, CTRCT30, HEL113, vimentin
External IDsOMIM: 193060; MGI: 98932; HomoloGene: 2538; GeneCards: VIM; OMA:VIM - orthologs
Orthologs
SpeciesHumanMouse
Entrez

7431

22352

Ensembl

ENSG00000026025

ENSMUSG00000026728

UniProt

P08670

P20152

RefSeq (mRNA)

NM_003380

NM_011701

RefSeq (protein)

NP_003371

NP_035831

Location (UCSC)Chr 10: 17.23 – 17.24 MbChr 2: 13.58 – 13.59 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse
Immunofluorescence staining pattern of vimentin antibodies. Produced by incubating vimentin primary antibodies and FITC labelled secondary antibodies with HEp-20-10 cells.

Vimentin is a structural protein that in humans is encoded by the VIM gene. Its name comes from the Latin vimentum which refers to an array of flexible rods.[5]

Immunofluorescence staining of HeLa Cells with antibody to reveal vimentin containing intermediate filaments in green and antibody to LAMP1 to reveal lysosomes in red. Nuclear DNA is seen in blue. Antibodies and image courtesy EnCor Biotechnology Inc.

Vimentin is a type III intermediate filament (IF) protein that is expressed in mesenchymal cells. IF proteins are found in all animal cells[6] as well as bacteria.[7] Intermediate filaments, along with tubulin-based microtubules and actin-based microfilaments, comprises the cytoskeleton. All IF proteins are expressed in a highly developmentally-regulated fashion; vimentin is the major cytoskeletal component of mesenchymal cells. Because of this, vimentin is often used as a marker of mesenchymally-derived cells or cells undergoing an epithelial-to-mesenchymal transition (EMT) during both normal development and metastatic progression.

Structure

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The assembly of the fibrous vimentin filament that forms the cytoskeleton follows a gradual sequence. The vimentin monomer has a central α-helical domain, capped on each end by non-helical amino (head) and carboxyl (tail) domains.[8] Two monomers are likely co-translationally expressed in a way that facilitates their interaction forming a coiled-coil dimer, which is the basic subunit of vimentin assembly.[9] A pair of coiled-coil dimers connect in an antiparallel fashion to form a tetramer. Eight tetramers join to form what is known as the unit-length filament (ULF), ULFs then stick to each other and elongate followed by compaction to form the fibrous proteins. [10]

The α-helical sequences contain a pattern of hydrophobic amino acids that contribute to forming a "hydrophobic seal" on the surface of the helix.[8] In addition, there is a periodic distribution of acidic and basic amino acids that seems to play an important role in stabilizing coiled-coil dimers.[8] The spacing of the charged residues is optimal for ionic salt bridges, which allows for the stabilization of the α-helix structure. While this type of stabilization is intuitive for intrachain interactions, rather than interchain interactions, scientists have proposed that perhaps the switch from intrachain salt bridges formed by acidic and basic residues to the interchain ionic associations contributes to the assembly of the filament.[8]

Function

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Vimentin plays a significant role in supporting and anchoring the position of the organelles in the cytosol. Vimentin is attached to the nucleus, endoplasmic reticulum, and mitochondria, either laterally or terminally.[11]

The dynamic nature of vimentin is important when offering flexibility to the cell. Scientists found that vimentin provided cells with a resilience absent from the microtubule or actin filament networks, when under mechanical stress in vivo. Therefore, in general, it is accepted that vimentin is the cytoskeletal component responsible for maintaining cell integrity. (It was found that cells without vimentin are extremely delicate when disturbed with a micropuncture).[12] Transgenic mice that lack vimentin appeared normal and did not show functional differences.[13] It is possible that the microtubule network may have compensated for the absence of the intermediate network. This result supports an intimate interaction between microtubules and vimentin. Moreover, when microtubule depolymerizers were present, vimentin reorganization occurred, once again implying a relationship between the two systems.[12] On the other hand, wounded mice that lack the vimentin gene heal slower than their wild type counterparts.[14]

In essence, vimentin is responsible for maintaining cell shape, integrity of the cytoplasm, and stabilizing cytoskeletal interactions. Vimentin has been shown to eliminate toxic proteins in JUNQ and IPOD inclusion bodies in asymmetric division of mammalian cell lines.[15]

Also, vimentin is found to control the transport of low-density lipoprotein, LDL, -derived cholesterol from a lysosome to the site of esterification.[16] With the blocking of transport of LDL-derived cholesterol inside the cell, cells were found to store a much lower percentage of the lipoprotein than normal cells with vimentin. This dependence seems to be the first process of a biochemical function in any cell that depends on a cellular intermediate filament network. This type of dependence has ramifications on the adrenal cells, which rely on cholesteryl esters derived from LDL.[16]

Vimentin plays a role in aggresome formation, where it forms a cage surrounding a core of aggregated protein.[17]

In addition to its conventional intracellular localisation, vimentin can be found extracellularly. Vimentin can be expressed as a cell surface protein and have suggested roles in immune reactions. It can also be released in phosphorylated forms to the extracellular space by activated macrophages, astrocytes are also known to release vimentin. [18]

Clinical significance

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It has been used as a sarcoma tumor marker to identify mesenchyme.[19][20] Its specificity as a biomarker has been disputed by Jerad Gardner.[21]Vimentin is present in spindle cell squameous cell carcinoma.[22][23]

Methylation of the vimentin gene has been established as a biomarker of colon cancer and this is being utilized in the development of fecal tests for colon cancer. Statistically significant levels of vimentin gene methylation have also been observed in certain upper gastrointestinal pathologies such as Barrett's esophagus, esophageal adenocarcinoma, and intestinal type gastric cancer.[24] High levels of DNA methylation in the promoter region have also been associated with markedly decreased survival in hormone positive breast cancers.[25] Downregulation of vimentin was identified in cystic variant of papillary thyroid carcinoma using a proteomic approach.[26] See also Anti-citrullinated protein antibody for its use in diagnosis of rheumatoid arthritis.

Vimentin was discovered to be an attachment factor for SARS-CoV-2 by Nader Rahimi and colleagues.[27]

Interactions

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Vimentin has been shown to interact with:

The 3' UTR of Vimentin mRNA has been found to bind a 46kDa protein.[39]

References

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  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000026025 – Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000026728 – Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Franke WW, Schmid E, Osborn M, Weber K (October 1978). "Different intermediate-sized filaments distinguished by immunofluorescence microscopy". Proceedings of the National Academy of Sciences of the United States of America. 75 (10): 5034–5038. Bibcode:1978PNAS...75.5034F. doi:10.1073/pnas.75.10.5034. PMC 336257. PMID 368806.
  6. ^ Eriksson JE, Dechat T, Grin B, Helfand B, Mendez M, Pallari HM, et al. (July 2009). "Introducing intermediate filaments: from discovery to disease". The Journal of Clinical Investigation. 119 (7): 1763–1771. doi:10.1172/JCI38339. PMC 2701876. PMID 19587451.
  7. ^ Cabeen MT, Jacobs-Wagner C (2010). "The bacterial cytoskeleton". Annual Review of Genetics. 44: 365–392. doi:10.1146/annurev-genet-102108-134845. PMID 21047262.
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  9. ^ Chang L, Shav-Tal Y, Trcek T, Singer RH, Goldman RD (February 2006). "Assembling an intermediate filament network by dynamic cotranslation". The Journal of Cell Biology. 172 (5): 747–758. doi:10.1083/jcb.200511033. PMC 2063706. PMID 16505169.
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  20. ^ "Immunohistochemistry from the Washington Animal Disease Diagnostic laboratory (WADDL)of the College of Veterinary Medicine, Washington State University". Archived from the original on 2008-12-01. Retrieved 2009-03-14.
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  22. ^ Dotto JE, Glusac EJ (June 2006). "p63 is a useful marker for cutaneous spindle cell squamous cell carcinoma". Journal of Cutaneous Pathology. 33 (6): 413–417. doi:10.1111/j.0303-6987.2006.00477.x. PMID 16776716. S2CID 38273016.
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  24. ^ Moinova H, Leidner RS, Ravi L, Lutterbaugh J, Barnholtz-Sloan JS, Chen Y, et al. (April 2012). "Aberrant vimentin methylation is characteristic of upper gastrointestinal pathologies". Cancer Epidemiology, Biomarkers & Prevention. 21 (4): 594–600. doi:10.1158/1055-9965.EPI-11-1060. PMC 3454489. PMID 22315367.
  25. ^ Ulirsch J, Fan C, Knafl G, Wu MJ, Coleman B, Perou CM, et al. (January 2013). "Vimentin DNA methylation predicts survival in breast cancer". Breast Cancer Research and Treatment. 137 (2): 383–396. doi:10.1007/s10549-012-2353-5. PMC 3838916. PMID 23239149.
  26. ^ Dinets A, Pernemalm M, Kjellin H, Sviatoha V, Sofiadis A, Juhlin CC, et al. (2015). "Differential protein expression profiles of cyst fluid from papillary thyroid carcinoma and benign thyroid lesions". PLOS ONE. 10 (5): e0126472. Bibcode:2015PLoSO..1026472D. doi:10.1371/journal.pone.0126472. PMC 4433121. PMID 25978681.
  27. ^ Amraei R, Xia C, Olejnik J, White MR, Napoleon MA, Lotfollahzadeh S, et al. (February 2022). "Extracellular vimentin is an attachment factor that facilitates SARS-CoV-2 entry into human endothelial cells". Proceedings of the National Academy of Sciences of the United States of America. 119 (6). Bibcode:2022PNAS..11913874A. doi:10.1073/pnas.2113874119. PMC 8833221. PMID 35078919. e2113874119.
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  29. ^ Lopez-Egido J, Cunningham J, Berg M, Oberg K, Bongcam-Rudloff E, Gobl A (August 2002). "Menin's interaction with glial fibrillary acidic protein and vimentin suggests a role for the intermediate filament network in regulating menin activity". Experimental Cell Research. 278 (2): 175–183. doi:10.1006/excr.2002.5575. PMID 12169273.
  30. ^ Rual JF, Venkatesan K, Hao T, Hirozane-Kishikawa T, Dricot A, Li N, et al. (October 2005). "Towards a proteome-scale map of the human protein-protein interaction network". Nature. 437 (7062): 1173–1178. Bibcode:2005Natur.437.1173R. doi:10.1038/nature04209. PMID 16189514. S2CID 4427026.
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  32. ^ Matsuzawa K, Kosako H, Inagaki N, Shibata H, Mukai H, Ono Y, et al. (May 1997). "Domain-specific phosphorylation of vimentin and glial fibrillary acidic protein by PKN". Biochemical and Biophysical Research Communications. 234 (3): 621–625. doi:10.1006/bbrc.1997.6669. PMID 9175763.
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  34. ^ Ratnayake WS, Apostolatos CA, Apostolatos AH, Schutte RJ, Huynh MA, Ostrov DA, et al. (2018). "Oncogenic PKC-ι activates Vimentin during epithelial-mesenchymal transition in melanoma; a study based on PKC-ι and PKC-ζ specific inhibitors". Cell Adhesion & Migration. 12 (5): 447–463. doi:10.1080/19336918.2018.1471323. PMC 6363030. PMID 29781749.
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Further reading

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