Intermediate filament

Intermediate filament rod domain
Intermediate filament rod domain
	Human vimentin coil 2b fragment (cys2)
Identifiers
Symbol	Filament
Pfam	PF00038
InterPro	IPR016044
PROSITE	PDOC00198
SCOP2	1gk7 / SCOPe / SUPFAM
Pfam
Available protein structures:
Pfam	structures / ECOD
PDB	RCSB PDB; PDBe; PDBj
PDBsum	structure summary

Available protein structures:
Pfam	structures / ECOD
PDB	RCSB PDB; PDBe; PDBj
PDBsum	structure summary

Intermediate filament tail domain
Intermediate filament tail domain
	Structure of lamin a/c globular domain
Identifiers
Symbol	IF_tail
Pfam	PF00932
InterPro	IPR001322
PROSITE	PDOC00198
SCOP2	1ivt / SCOPe / SUPFAM
Pfam
Available protein structures:
Pfam	structures / ECOD
PDB	RCSB PDB; PDBe; PDBj
PDBsum	structure summary

Intermediate filament head (DNA binding) region

Identifiers

Symbol

Filament_head

1gk7 / SCOPe / SUPFAM

Available protein structures:
Pfam	structures / ECOD
PDB	RCSB PDB; PDBe; PDBj
PDBsum	structure summary

Peripherin neuronal intermediate filament protein

Identifiers

Symbol

PRPH

Alt. symbols

NEF4

Other data

Chr. 12 q13.12

Search for
Structures	Swiss-model
Domains	InterPro

Nestin neuronal stem cell intermediate filament protein

Identifiers

Symbol

NES

Other data

Chr. 1 q23.1

Search for
Structures	Swiss-model
Domains	InterPro

Intermediate filaments (IFs) are cytoskeletal structural components found in the cells of vertebrates, and many invertebrates.^[1]^[2]^[3] Homologues of the IF protein have been noted in an invertebrate, the cephalochordate Branchiostoma.^[4]

Intermediate filaments are composed of a family of related proteins sharing common structural and sequence features. Initially designated 'intermediate' because their average diameter (10 nm) is between those of narrower microfilaments (actin) and wider myosin filaments found in muscle cells, the diameter of intermediate filaments is now commonly compared to actin microfilaments (7 nm) and microtubules (25 nm).^[1]^[5] Animal intermediate filaments are subcategorized into six types based on similarities in amino acid sequence and protein structure.^[6] Most types are cytoplasmic, but one type, Type V is a nuclear lamin. Unlike microtubules, IF distribution in cells shows no good correlation with the distribution of either mitochondria or endoplasmic reticulum.^[7]

^ ^a ^b Herrmann H, Bär H, Kreplak L, Strelkov SV, Aebi U (July 2007). "Intermediate filaments: from cell architecture to nanomechanics". Nature Reviews. Molecular Cell Biology. 8 (7): 562–73. doi:10.1038/nrm2197. PMID 17551517. S2CID 27115011.
^ Chang L, Goldman RD (August 2004). "Intermediate filaments mediate cytoskeletal crosstalk". Nature Reviews. Molecular Cell Biology. 5 (8): 601–13. doi:10.1038/nrm1438. PMID 15366704. S2CID 31835055.
^ Traub, P. (2012), Intermediate Filaments: A Review, Springer Berlin Heidelberg, p. 33, ISBN 978-3-642-70230-3
^ Karabinos A, Riemer D, Erber A, Weber K (October 1998). "Homologues of vertebrate type I, II and III intermediate filament (IF) proteins in an invertebrate: the IF multigene family of the cephalochordate Branchiostoma". FEBS Letters. 437 (1–2): 15–8. doi:10.1016/S0014-5793(98)01190-9. PMID 9804163. S2CID 7886395.
^ Ishikawa H, Bischoff R, Holtzer H (September 1968). "Mitosis and intermediate-sized filaments in developing skeletal muscle". The Journal of Cell Biology. 38 (3): 538–55. doi:10.1083/jcb.38.3.538. PMC 2108373. PMID 5664223.
^ Szeverenyi I, Cassidy AJ, Chung CW, Lee BT, Common JE, Ogg SC, et al. (March 2008). "The Human Intermediate Filament Database: comprehensive information on a gene family involved in many human diseases". Human Mutation. 29 (3): 351–360. doi:10.1002/humu.20652. PMID 18033728. S2CID 20760837.
^ Soltys BJ, Gupta RS (1992). "Interrelationships of endoplasmic reticulum, mitochondria, intermediate filaments, and microtubules--a quadruple fluorescence labeling study". Biochemistry and Cell Biology. 70 (10–11): 1174–86. doi:10.1139/o92-163. PMID 1363623.

[pmid17551517-1] Herrmann H, Bär H, Kreplak L, Strelkov SV, Aebi U (July 2007). "Intermediate filaments: from cell architecture to nanomechanics". Nature Reviews. Molecular Cell Biology. 8 (7): 562–73. doi:10.1038/nrm2197. PMID 17551517. S2CID 27115011.

[Chang-2] Chang L, Goldman RD (August 2004). "Intermediate filaments mediate cytoskeletal crosstalk". Nature Reviews. Molecular Cell Biology. 5 (8): 601–13. doi:10.1038/nrm1438. PMID 15366704. S2CID 31835055.

[3] Traub, P. (2012), Intermediate Filaments: A Review, Springer Berlin Heidelberg, p. 33, ISBN 978-3-642-70230-3

[pmid9804163-4] Karabinos A, Riemer D, Erber A, Weber K (October 1998). "Homologues of vertebrate type I, II and III intermediate filament (IF) proteins in an invertebrate: the IF multigene family of the cephalochordate Branchiostoma". FEBS Letters. 437 (1–2): 15–8. doi:10.1016/S0014-5793(98)01190-9. PMID 9804163. S2CID 7886395.

[pmid5664223-5] Ishikawa H, Bischoff R, Holtzer H (September 1968). "Mitosis and intermediate-sized filaments in developing skeletal muscle". The Journal of Cell Biology. 38 (3): 538–55. doi:10.1083/jcb.38.3.538. PMC 2108373. PMID 5664223.

[interfil-6] Szeverenyi I, Cassidy AJ, Chung CW, Lee BT, Common JE, Ogg SC, et al. (March 2008). "The Human Intermediate Filament Database: comprehensive information on a gene family involved in many human diseases". Human Mutation. 29 (3): 351–360. doi:10.1002/humu.20652. PMID 18033728. S2CID 20760837.

[pmid1363623-7] Soltys BJ, Gupta RS (1992). "Interrelationships of endoplasmic reticulum, mitochondria, intermediate filaments, and microtubules--a quadruple fluorescence labeling study". Biochemistry and Cell Biology. 70 (10–11): 1174–86. doi:10.1139/o92-163. PMID 1363623.

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