Summary: Bin/amphiphysin/Rvs domain for vesicular trafficking
This is the Wikipedia entry entitled "BAR domain". More...
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BAR domain Edit Wikipedia article
Structure of amphiphysin BAR.
BAR (Bin–Amphiphysin–Rvs) domains are highly conserved protein dimerisation domains that occur in many proteins involved in membrane dynamics in a cell. The BAR domain is banana shaped and binds to membrane via its concave face. It is capable of sensing membrane curvature by binding preferentially to curved membranes.
BAR domains occur in combinations with other domains
Many BAR family proteins contain alternative lipid specificity domains that help target these protein to particular membrane compartments. Some also have SH3 domains that bind to dynamin and thus proteins like amphiphysin and endophilin are implicated in the orchestration of vesicle scission.
Some BAR domain containing proteins have an N-terminal amphipathic helix preceding the BAR domain. This helix inserts (like in the epsin ENTH domain) into the membrane and induces curvature, which is stabilised by the BAR dimer. Amphiphysin, endophilin, BRAP1/bin2 and nadrin are examples of such proteins containing an N-BAR. The Drosophila amphiphysin N-BAR (DA-N-BAR) is an example of a protein with a preference for negatively charged surfaces.
F-BAR (EFC) domain
F-BAR domains (for FCH-BAR, or EFC for Extended FCH Homology) are BAR domains that are extensions of the already established FCH domain. They are frequently found at the amino terminus of proteins. They can bind lipid membranes and can tubulate lipids in vitro and in vivo, but their exact physiological role remains to be elucidated. Syndapin/pacsin proteins are an example of an F-BAR protein family.
Human proteins containing this domain
- Leventis PA, Chow BM, Stewart BA, Iyengar B, Campos AR, Boulianne GL (November 2001). "Drosophila Amphiphysin is a post-synaptic protein required for normal locomotion but not endocytosis". Traffic 2 (11): 839–50. doi:10.1034/j.1600-0854.2001.21113.x. PMID 11733051.
- Zhang B, Zelhof AC (July 2002). "Amphiphysins: raising the BAR for synaptic vesicle recycling and membrane dynamics. Bin-Amphiphysin-Rvsp". Traffic 3 (7): 452–60. doi:10.1034/j.1600-0854.2002.30702.x. PMID 12047553.Review.
- Zelhof AC, Bao H, Hardy RW, Razzaq A, Zhang B, Doe CQ (December 2001). "Drosophila Amphiphysin is implicated in protein localization and membrane morphogenesis but not in synaptic vesicle endocytosis". Development 128 (24): 5005–15. PMID 11748137.
- Mathew D, Popescu A, Budnik V (November 2003). "Drosophila amphiphysin functions during synaptic Fasciclin II membrane cycling". J. Neurosci. 23 (33): 10710–6. PMID 14627656.
- Peter BJ, Kent HM, Mills IG, et al. (January 2004). "BAR domains as sensors of membrane curvature: the amphiphysin BAR structure". Science 303 (5657): 495–9. doi:10.1126/science.1092586. PMID 14645856.
- Weissenhorn W (August 2005). "Crystal structure of the endophilin-A1 BAR domain". J. Mol. Biol. 351 (3): 653–61. doi:10.1016/j.jmb.2005.06.013. PMID 16023669.
- Gallop JL, Jao CC, Kent HM, et al. (June 2006). "Mechanism of endophilin N-BAR domain-mediated membrane curvature". EMBO J. 25 (12): 2898–910. doi:10.1038/sj.emboj.7601174. PMC 1500843. PMID 16763559.
- Masuda M, Takeda S, Sone M, et al. (June 2006). "Endophilin BAR domain drives membrane curvature by two newly identified structure-based mechanisms". EMBO J. 25 (12): 2889–97. doi:10.1038/sj.emboj.7601176. PMC 1500852. PMID 16763557.
- Frost A, Perera R, Roux A, et al. (March 2008). "Structural basis of membrane invagination by F-BAR domains". Cell 132 (5): 807–17. doi:10.1016/j.cell.2007.12.041. PMC 2384079. PMID 18329367.
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This Pfam entry includes proteins that are not matched by PF03114.
Querin L, Sanvito R, Magni F, Busti S, Van Dorsselaer A, Alberghina L, Vanoni M; , J Biol Chem. 2007; [Epub ahead of print]: Proteomic analysis of a nutritional Shift-up in S. cerevisiae identifies Gvp36 as a BAR-containing protein involved in vesicular traffic and nutritional adaptation. PUBMED:18156177 EPMC:18156177
Internal database links
|Similarity to PfamA using HHSearch:||BAR|
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR018859
Endocytosis and intracellular transport involve several mechanistic steps:
- (1) for the internalisation of cargo molecules, the membrane needs to bend to form a vesicular structure, which requires membrane curvature and a rearrangement of the cytoskeleton;
- (2) following its formation, the vesicle has to be pinched off the membrane;
- (3) the cargo has to be subsequently transported through the cell and the vesicle must fuse with the correct cellular compartment.
The crystal structure of these proteins suggest the domain forms a crescent-shaped dimer of a three-helix coiled coil with a characteristic set of conserved hydrophobic, aromatic and hydrophilic amino acids. Proteins containing this domain have been shown to homodimerise, heterodimerise or, in a few cases, interact with small GTPases.
- the number of sequences which exhibit this architecture
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This example describes an architecture with one
Gladomain, followed by two consecutive
EGFdomains, and finally a single
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This clan contains families that are involved in intracellular transport and signalling. Arfaptins are proteins which interact with small GTPases involved in vesicular budding at the Golgi complex. They form an elongated dimer of three helix coiled coils and are structurally very similar to the BAR domain . The Sec34 family is involved in tethering vesicles to the Golgi .
The clan contains the following 9 members:Arfaptin BAR BAR_2 BAR_3_WASP_bdg FAM92 IMD Pil1 Sec34 Vps5
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Curation and family details
|Seed source:||Pfam-B_12557 (release 22.0)|
|Author:||Mistry J, Wood V|
|Number in seed:||10|
|Number in full:||190|
|Average length of the domain:||273.70 aa|
|Average identity of full alignment:||37 %|
|Average coverage of the sequence by the domain:||82.41 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||4|
|Download:||download the raw HMM for this family|
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