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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

X: HTH
H: HTH
T: winged
F: RNase_H2-Ydr279

PF09468 CL0123

Representatives:

e3kioB2[B:93-102,B:146-181,B:267-282] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBONUCLEASE H2 SUBUNIT B ; X-RAY DIFFRACTION 2.9Å

e3pufE2[E:83-183,E:204-228] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBONUCLEASE H2 SUBUNIT B ; X-RAY DIFFRACTION 3.1Å

e3pufK2[K:83-184,K:207-232] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBONUCLEASE H2 SUBUNIT B ; X-RAY DIFFRACTION 3.1Å

e3pufH1[H:93-232] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBONUCLEASE H2 SUBUNIT B ; X-RAY DIFFRACTION 3.1Å

e3pufQ3[Q:83-185,Q:209-232] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBONUCLEASE H2 SUBUNIT B ; X-RAY DIFFRACTION 3.1Å

e3p56E3[E:82-184] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBONUCLEASE H2 SUBUNIT B ; X-RAY DIFFRACTION 4.06Å

e3pufN3[N:93-230] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBONUCLEASE H2 SUBUNIT B ; X-RAY DIFFRACTION 3.1Å

e3pufB2[B:93-231] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBONUCLEASE H2 SUBUNIT B ; X-RAY DIFFRACTION 3.1Å

e3p56B2[B:93-226] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBONUCLEASE H2 SUBUNIT B ; X-RAY DIFFRACTION 4.06Å

e3p5jB2[B:93-231] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribonuclease H2 subunit B ; X-RAY DIFFRACTION

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: DNA-binding domain of intron-encoded endonucleases

lacks the N-terminal helix, circularly permuted wing

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

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