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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

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

X: Alpha-beta plaits
H: NOL1/NOP2/sun N-terminal ferredoxin-like domain
T: NOL1/NOP2/sun N-terminal ferredoxin-like domain
F: RsmF-B_ferredox

PF22458

Representatives:

e1sqgA3[A:145-231] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SUN protein ; X-RAY DIFFRACTION 1.65Å

e1sqfA3[A:145-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SUN protein ; X-RAY DIFFRACTION 2.0Å

e2yxlA3[A:144-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

450AA LONG HYPOTHETICAL FMU PROTEIN ; X-RAY DIFFRACTION 2.55Å

e5zvdB3[B:5-79] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

389aa long hypothetical nucleolar protein ; X-RAY DIFFRACTION 2.594Å

e5zvdA3[A:5-79] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

389aa long hypothetical nucleolar protein ; X-RAY DIFFRACTION 2.594Å

e5zveB3[B:5-79] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

389aa long hypothetical nucleolar protein ; X-RAY DIFFRACTION 2.1780Å

e5zveA3[A:5-79] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

389aa long hypothetical nucleolar protein ; X-RAY DIFFRACTION 2.1780Å

e5zvgB3[B:5-79] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

389aa long hypothetical nucleolar protein ; X-RAY DIFFRACTION 2.500Å

e5zvgA3[A:5-79] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

389aa long hypothetical nucleolar protein ; X-RAY DIFFRACTION 2.500Å

e5zvhB3[B:5-79] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

389aa long hypothetical nucleolar protein ; X-RAY DIFFRACTION 2.500Å

e5zvhA3[A:5-79] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

389aa long hypothetical nucleolar protein ; X-RAY DIFFRACTION 2.500Å

e6em5q1[q:227-330] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

25S rRNA (cytosine(2870)-C(5))-methyltransferase ; ELECTRON MICROSCOPY

e6elzq1[q:227-330] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

25S rRNA (cytosine(2870)-C(5))-methyltransferase ; ELECTRON MICROSCOPY

e8i9rCP2[CP:262-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA methyltransferase nop2-like protein ; ELECTRON MICROSCOPY

e8i9tCP2[CP:262-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA methyltransferase nop2-like protein ; ELECTRON MICROSCOPY

e8i9vCP2[CP:262-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA methyltransferase nop2-like protein ; ELECTRON MICROSCOPY

e8i9zCP2[CP:262-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA methyltransferase nop2-like protein ; ELECTRON MICROSCOPY

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.

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

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