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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

X: Ferritin/Heme oxygenase/4-helical cytokines
H: Ferritin/Heme oxygenase
T: Ferritin
F: DUF892

PF05974 CL0044

Representatives:

e2gyqA1[A:1-160] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

ycfI, putative structural protein ; ligands: ACT,EDO,FE,NA,ZN ; X-RAY DIFFRACTION 1.40Å

e2gyqB1[B:3-159] Image Pymol Jmol Links: PDB, SCOP, CATH

ycfI, putative structural protein ; ligands: ACT,EDO,FE,ZN ; X-RAY DIFFRACTION 1.40Å

e1u7jA1[A:1-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Four-helix bundle model ; ligands: ZN ; SOLUTION NMR

e1u7jB1[B:1-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Four-helix bundle model ; ligands: ZN ; SOLUTION NMR

e2gs4B1[B:4-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN YCIF ; X-RAY DIFFRACTION 2.0Å

e2gs4A1[A:3-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN YCIF ; X-RAY DIFFRACTION 2.0Å

e3oghB1[B:-2-160] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN YCIE ; ligands: CL,FE,MG ; X-RAY DIFFRACTION 1.65Å

e4eruA1[A:0-158] Image Pymol Jmol Links: PDB, SCOP, CATH

YCIF BACTERIAL STRESS RESPONSE PROTEIN ; ligands: MG,MLT ; X-RAY DIFFRACTION 2.1Å

e3hiuB1[B:4-164] Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED PROTEIN ; ligands: EDO,NA ; X-RAY DIFFRACTION 1.85Å

e3hiuC1[C:5-166] Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED PROTEIN ; ligands: EDO,NA ; X-RAY DIFFRACTION 1.85Å

e3hiuD1[D:5-164] Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED PROTEIN ; ligands: EDO,NA ; X-RAY DIFFRACTION 1.85Å

e3oghA1[A:0-162] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN YCIE ; ligands: FE,MG ; X-RAY DIFFRACTION 1.65Å

e4eruB1[B:-2-156] Image Pymol Jmol Links: PDB, SCOP, CATH

YCIF BACTERIAL STRESS RESPONSE PROTEIN ; ligands: MG,MLT ; X-RAY DIFFRACTION 2.1Å

e3hiuA2[A:5-164] Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED PROTEIN ; ligands: EDO,NA ; X-RAY DIFFRACTION 1.85Å

e7tmvA1[A:11-169] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative structural protein ; ligands: ZN ; X-RAY DIFFRACTION 2.300Å

e7tmvB1[B:10-164] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative structural protein ; ligands: ZN ; X-RAY DIFFRACTION 2.300Å

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.

T: Heme oxygenase/Ribonucleotide reductase

additional helices in N- and C- termini

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

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