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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative

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Evolutionary classification of protein domain structures

alpha arraysalpha-helix arrays with mainly perpendicular helices

alpha bundlesalpha-helix bundles with mainly parallel helices

alpha superhelicesrepeating alpha-helix hairpins form a superhelix

alpha duplicates or obligate multimersalpha duplicates or monomers associate together to form a compact domain

alpha complex topologyalpha domain with complex and unique topology that cannot be described as array or bundle or superhelix

beta barrelssingle beta-sheet folded upon itself to form a barrel

beta meanderssingle beta-sheet with mainly meander topology

beta sandwichestwo beta-sheets stacked together to form a sandwich

beta duplicates or obligate multimersbeta duplicates or monomers associate together to form a compact domain

X: Single-stranded right-handed beta-helix
H: Leucine-rich repeats
T: Leucine-rich repeats
F: LRR_8

PF13855 CL0022

Representatives:

e1oznA1[A:26-309] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RETICULON 4 RECEPTOR ; ligands: ACY ; X-RAY DIFFRACTION 1.52Å

e3wpcA1[A:28-432,A:464-806] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toll-like receptor 9 ; ligands: NAG,SO4 ; X-RAY DIFFRACTION 1.60Å

e1xkuA1[A:22-326] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DECORIN ; ligands: NAG ; X-RAY DIFFRACTION 2.15Å

e4lxrA1[A:28-800] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein toll ; ligands: EPE,NAG ; X-RAY DIFFRACTION 2.200Å

e5hz0B1[B:61-687] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Probable LRR receptor-like serine/threonine-protein kinase At4g26540 ; ligands: NAG ; X-RAY DIFFRACTION 2.550Å

e3ojaB1[B:138-524] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ANOPHELES PLASMODIUM-RESPONSIVE LEUCINE-RICH REPEAT PROTEIN 1 ; ligands: NAG ; X-RAY DIFFRACTION 2.7Å

e5hz3B1[B:61-688] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Probable LRR receptor-like serine/threonine-protein kinase At4g26540 ; ligands: NAG ; X-RAY DIFFRACTION 2.860Å

e5hyxB1[B:61-689] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Probable LRR receptor-like serine/threonine-protein kinase At4g26540 ; ligands: NAG ; X-RAY DIFFRACTION 2.5960Å

e4hq1A3[A:24-447] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROBABLE RECEPTOR PROTEIN KINASE TMK1 ; X-RAY DIFFRACTION 1.55Å

e4z5wB1[B:27-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phytosulfokine receptor 1 ; ligands: NAG ; X-RAY DIFFRACTION 2.2Å

e4lsxA3[A:31-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN BRASSINOSTEROID INSENSITIVE 1 ; ligands: NAG ; X-RAY DIFFRACTION 3.3Å

e4lsaA2[A:29-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN BRASSINOSTEROID INSENSITIVE 1 ; ligands: NAG ; X-RAY DIFFRACTION 2.5Å

e4z61A1[A:27-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phytosulfokine receptor 1 ; ligands: NAG ; X-RAY DIFFRACTION 2.750Å

e4m7eB2[B:30-376] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN BRASSINOSTEROID INSENSITIVE 1 ; ligands: NAG ; X-RAY DIFFRACTION 3.6Å

e4z61B1[B:27-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phytosulfokine receptor 1 ; ligands: NAG ; X-RAY DIFFRACTION 2.750Å

e5wlsA1[A:26-233] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pollen receptor-like kinase 3 ; ligands: NAG ; X-RAY DIFFRACTION 2.496Å

e6djbB2[B:409-802] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Volume-regulated anion channel subunit LRRC8A ; ELECTRON MICROSCOPY

e6djbA2[A:409-802] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Volume-regulated anion channel subunit LRRC8A ; ELECTRON MICROSCOPY

e5wlsB1[B:26-233] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pollen receptor-like kinase 3 ; ligands: NAG ; X-RAY DIFFRACTION 2.496Å

e6qwnA1[A:63-400] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pollen-specific leucine-rich repeat extensin-like protein 1 ; ligands: NAG ; X-RAY DIFFRACTION 3.892Å

e6djbE1[E:409-802] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Volume-regulated anion channel subunit LRRC8A ; ELECTRON MICROSCOPY

e6qwnB1[B:63-400] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pollen-specific leucine-rich repeat extensin-like protein 1 ; X-RAY DIFFRACTION 3.892Å

e6djbF1[F:409-802] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Volume-regulated anion channel subunit LRRC8A ; ELECTRON MICROSCOPY

e6djbC1[C:409-802] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Volume-regulated anion channel subunit LRRC8A ; ELECTRON MICROSCOPY

e6qwnC1[C:59-400] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pollen-specific leucine-rich repeat extensin-like protein 1 ; X-RAY DIFFRACTION 3.892Å

e6qwnD1[D:63-400] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pollen-specific leucine-rich repeat extensin-like protein 1 ; ligands: NAG ; X-RAY DIFFRACTION 3.892Å

e6djbD2[D:409-802] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Volume-regulated anion channel subunit LRRC8A ; ELECTRON MICROSCOPY

e5xjxK1[K:28-571] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LRR receptor-like serine/threonine-protein kinase ERL1 ; X-RAY DIFFRACTION 3.05Å

e6qwnE1[E:63-400] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pollen-specific leucine-rich repeat extensin-like protein 1 ; X-RAY DIFFRACTION 3.892Å

e5xjoC1[C:52-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 2.626Å

e5xjxA1[A:28-571] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LRR receptor-like serine/threonine-protein kinase ERL1 ; X-RAY DIFFRACTION 3.05Å

e5xjxI1[I:28-571] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LRR receptor-like serine/threonine-protein kinase ERL1 ; X-RAY DIFFRACTION 3.05Å

e5xjoD1[D:52-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 2.626Å

e5xjxC1[C:50-414] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 3.05Å

e5xjxF1[F:50-414] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 3.05Å

e5xjxD1[D:50-414] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 3.05Å

e5xjxL1[L:50-414] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 3.05Å

e5xjxH1[H:50-414] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 3.05Å

e5xjxJ1[J:50-414] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 3.05Å

e5xkjC1[C:50-412] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 3.45Å

e5xkjD1[D:50-412] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein TOO MANY MOUTHS ; X-RAY DIFFRACTION 3.45Å

e7brcA1[A:26-450] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Receptor-like kinase TMK3 ; ligands: NAG ; X-RAY DIFFRACTION 2.06Å

e7drbC2[C:29-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Membrane-localized LRR receptor-like protein ; ligands: NAG ; X-RAY DIFFRACTION 3.3Å

e7drbD2[D:29-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Membrane-localized LRR receptor-like protein ; ligands: NAG ; X-RAY DIFFRACTION 3.3Å

e7odkAAA1[AAA:18-606] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Receptor-like protein kinase HSL1 ; ligands: EDO,NAG,SO4 ; X-RAY DIFFRACTION 1.83Å

e7ogzAAA1[AAA:14-606] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Receptor-like protein kinase HSL1 ; ligands: NAG ; X-RAY DIFFRACTION 2.70Å

e7ogzDDD1[DDD:15-606] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Receptor-like protein kinase HSL1 ; ligands: NAG ; X-RAY DIFFRACTION 2.70Å

e1xwdC1[C:18-259] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FOLLICLE STIMULATING HORMONE RECEPTOR ; ligands: NAG,SO4 ; X-RAY DIFFRACTION 2.92Å

F: Unmapped domains

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.

beta complex topologybeta domains with complex and unique topology that cannot be described as barrel or sandwich or meander

a+b two layersone alpha-helix layer and one beta-sheet layer

a+b three layersone mainly antiparallel beta-sheet layer sandwiched between two alpha-helix layers

a+b four layerstwo beta-sheet layers sandwiched between two alpha-helix layers

a+b complex topologyalpha and beta domain with complex and unique topology that cannot be described in layers

a+b duplicates or obligate multimersalpha and beta duplicates or monomers associated together to form a compact domain

a/b barrelsrepeating beta-alpha units form a barrel

a/b three-layered sandwichesrepeating beta-alpha units form a sandwich with a mainly parallel beta-sheet layer stacked between two alpha-helix layers

mixed a+b and a/balpha and beta domain consists of both a+b and a/b regions

few secondary structure elementsstabilized by cofactors or disulfides

extended segmentsextended, non-globular segments, frequently bind to other proteins to form complexes