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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

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

X: Rossmann-like
H: Rossmann-related
T: S-adenosyl-L-methionine-dependent methyltransferases
F: Fibrillarin

PF01269 CL0063

Representatives:

e1g8aA1[A:1-227] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

FIBRILLARIN-LIKE PRE-RRNA PROCESSING PROTEIN ; X-RAY DIFFRACTION 1.4Å

e7mq8SC1[SC:85-317] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

rRNA 2'-O-methyltransferase fibrillarin ; ELECTRON MICROSCOPY

e7mq8SD1[SD:78-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

rRNA 2'-O-methyltransferase fibrillarin ; ELECTRON MICROSCOPY

e7mq9SC1[SC:85-317] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

rRNA 2'-O-methyltransferase fibrillarin ; ELECTRON MICROSCOPY

e7mq9SD1[SD:78-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

rRNA 2'-O-methyltransferase fibrillarin ; ELECTRON MICROSCOPY

e7mqaSC1[SC:86-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

rRNA 2'-O-methyltransferase fibrillarin ; ELECTRON MICROSCOPY

e7mqaSD1[SD:79-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

rRNA 2'-O-methyltransferase fibrillarin ; ELECTRON MICROSCOPY

e1nt2A1[A:2-210] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fibrillarin-like pre-rRNA processing protein ; ligands: SAM ; X-RAY DIFFRACTION 2.90Å

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.

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