Summary: L27 domain
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L27 domain Edit Wikipedia article
Structure of presynaptic protein SAP97.
hetero-tetrameric l27 (lin-2, lin-7) domain complexes as organization platforms of supra-molecular assemblies
2.1 angstrom crystal structure of the pals-1-l27n and patj l27 heterodimer complex
2.1 angstrom crystal structure of the pals-1-l27n and patj l27 heterodimer complex
The L27 domain is a protein domain that is found in receptor targeting proteins Lin-2 and Lin-7 (LIN7A, LIN7B, LIN7C), as well as some protein kinases and human MPP2 protein. The L27 domain is a protein interaction module that exists in a large family of scaffold proteins, functioning as an organisation centre of large protein assemblies required for the establishment and maintenance of cell polarity. L27 domains form specific heterotetrameric complexes, in which each domain contains three alpha-helices.
The L27_2 domain is a protein-protein interaction domain capable of organising scaffold proteins into supramolecular assemblies by formation of heteromeric L27_2 domain complexes. L27_2 domain-mediated protein assemblies have been shown to play essential roles in cellular processes including asymmetric cell division, establishment and maintenance of cell polarity, and clustering of receptors and ion channels. Members of this family form specific heterotetrameric complexes, in which each domain contains three alpha-helices. The two N-terminal helices of each L27_2 domain pack together to form a tight, four-helix bundle in the heterodimer, whilst the third helix of each L27_2 domain forms another four-helix bundle that assembles the two units of the heterodimer into a tetramer.
The L27_N domain is often found at the N-terminus of the L27 domain. It plays a role in the biogenesis of tight junctions and in the establishment of cell polarity in epithelial cells. Each L27_N domain consists of three alpha-helices, the first two of which form an antiparallel coiled-coil. Two L27 domains come together to form a four-helical bundle with the antiparallel coiled-coils formed by the first two helices. The third helix of each domain forms another coiled-coil packing at one end of the four-helix bundle, creating a large hydrophobic interface: the hydrophobic interactions are the major force that drives heterodimer formation.
- Feng W, Long JF, Fan JS, Suetake T, Zhang M (May 2004). "The tetrameric L27 domain complex as an organization platform for supramolecular assemblies". Nat. Struct. Mol. Biol. 11 (5): 475–80. doi:10.1038/nsmb751. PMID 15048107.
- Doerks T, Bork P, Kamberov E, Makarova O, Muecke S, Margolis B (July 2000). "L27, a novel heterodimerization domain in receptor targeting proteins Lin-2 and Lin-7". Trends Biochem. Sci. 25 (7): 317–8. PMID 10871881.
- Feng W, Long JF, Zhang M (May 2005). "A unified assembly mode revealed by the structures of tetrameric L27 domain complexes formed by mLin-2/mLin-7 and Patj/Pals1 scaffold proteins". Proc. Natl. Acad. Sci. U.S.A. 102 (19): 6861–6. doi:10.1073/pnas.0409346102. PMC 1100767. PMID 15863617.
- Li Y, Karnak D, Demeler B, Margolis B, Lavie A (July 2004). "Structural basis for L27 domain-mediated assembly of signaling and cell polarity complexes". EMBO J. 23 (14): 2723–33. doi:10.1038/sj.emboj.7600294. PMC 514954. PMID 15241471.
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L27 domain Provide feedback
The L27 domain is found in receptor targeting proteins Lin-2 and Lin-7.
Doerks T, Bork P, Kamberov E, Makarova O, Muecke S, Margolis B; , Trends Biochem Sci 2000;25:317-318.: L27, a novel heterodimerization domain in receptor targeting proteins Lin-2 and Lin-7. PUBMED:10871881 EPMC:10871881
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Curation and family details
|Seed source:||Alignment kindly provided by SMART|
|Number in seed:||20|
|Number in full:||1179|
|Average length of the domain:||53.10 aa|
|Average identity of full alignment:||24 %|
|Average coverage of the sequence by the domain:||14.32 %|
|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:||11|
|Download:||download the raw HMM for this family|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the L27 domain has been found. There are 20 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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