| Armadillo repeat domain | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 Structure of the armadillo domain of β-catenin. | |||||||||
| Identifiers | |||||||||
| Symbol | Arm | ||||||||
| Pfam | PF00514 | ||||||||
| Pfam clan | CL0020 | ||||||||
| InterPro | IPR000225 | ||||||||
| SMART | SM00185 | ||||||||
| PROSITE | PS50176 | ||||||||
| SCOP2 | 3bct / SCOPe / SUPFAM | ||||||||
| CDD | cd00020 | ||||||||
| Membranome | 350 | ||||||||
| |||||||||
An armadillo repeat is a characteristic, repetitive amino acid sequence of about 42 residues in length that is found in many proteins. Proteins that contain armadillo repeats typically contain several tandemly repeated copies. Each armadillo repeat is composed of a pair of alpha helices that form a hairpin structure. Multiple copies of the repeat form what is known as an alpha solenoid structure.
Examples of proteins that contain armadillo repeats include β-catenin, Sarm1 (SARM1), α-importin, plakoglobin, adenomatous polyposis coli (APC), and many others.
The term armadillo derives from the historical name of the β-catenin gene in the fruitfly Drosophila where the armadillo repeat was first discovered. Although β-catenin was previously believed to be a protein involved in linking cadherin cell adhesion proteins to the cytoskeleton, recent work indicates that β-catenin regulates the homodimerization of alpha-catenin, which in turn controls actin branching and bundling. But, the armadillo repeat is found in a wide range of proteins with other functions. This type of protein domain is important in transducing WNT signals during embryonic development.
Structure
The 3-dimensional fold of an armadillo repeat was first observed in the crystal structure of β-catenin, where the 12 tandem repeats form a superhelix of alpha helices with three helices per unit. The cylindrical structure features a positively charged groove, which presumably interacts with the acidic surfaces of the known interaction partners of β-catenin.
References
- ^ Huber AH, Nelson WJ, Weis WI (September 1997). "Three-dimensional structure of the armadillo repeat region of β-catenin". Cell. 90 (5): 871–82. doi:10.1016/S0092-8674(00)80352-9. PMID 9298899. S2CID 18612343.
- Peifer M, Berg S, Reynolds AB (1994). "A repeating amino acid motif shared by proteins with diverse cellular roles". Cell. 76 (5): 789–91. doi:10.1016/0092-8674(94)90353-0. PMID 7907279. S2CID 26528190.
- Groves MR, Barford D (1999). "Topological characteristics of helical repeat proteins". Current Opinion in Structural Biology. 9 (3): 383–9. doi:10.1016/S0959-440X(99)80052-9. PMID 10361086.
- "Scopus preview - Scopus - Welcome to Scopus". www.scopus.com. Retrieved 2023-03-21.
- Herold A, Truant R, Wiegand H, Cullen BR (October 1998). "Determination of the functional domain organization of the importin alpha nuclear import factor". J. Cell Biol. 143 (2): 309–18. doi:10.1083/jcb.143.2.309. PMC 2132842. PMID 9786944.
- McCrea PD, Turck CW, Gumbiner B (November 1991). "A homolog of the armadillo protein in Drosophila (plakoglobin) associated with E-cadherin". Science. 254 (5036): 1359–61. Bibcode:1991Sci...254.1359M. doi:10.1126/science.1962194. PMID 1962194.
- Hirschl D, Bayer P, Müller O (March 1996). "Secondary structure of an armadillo single repeat from the APC protein". FEBS Lett. 383 (1–2): 31–6. doi:10.1016/0014-5793(96)00215-3. PMID 8612785. S2CID 36190869.
- Nusse, Roel, and Hans Clevers. “Wnt/β-Catenin Signaling, Disease, and Emerging Therapeutic Modalities.” Cell, vol. 169, no. 6, 1 June 2017, pp. 985–999., doi:10.1016/j.cell.2017.05.016.
- "Armadillo (IPR000225)". InterPro. EMBL-EBI.
External links
- Eukaryotic Linear Motif resource motif class TRG_NLS_Bipartite_1
- Eukaryotic Linear Motif resource motif class TRG_NLS_MonoCore_2
- Eukaryotic Linear Motif resource motif class TRG_NLS_MonoExtC_3
- Eukaryotic Linear Motif resource motif class TRG_NLS_MonoExtN_4
- Armadillo+Domain+Proteins at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
- Armadillo/plakoglobin ARM repeat in PROSITE
| Protein tandem repeats | |
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| Fibrous: | |
| Elongated: | |
| Closed: | |
| Beads-on-a-string: | |
| See also: | |
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