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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: tri-helical
F: Homeodomain

PF00046 CL0123

Representatives:

e1pufA1[A:193-269] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HOMEOBOX PROTEIN HOX-A9 ; X-RAY DIFFRACTION 1.9Å

e1e3oC1[C:104-160] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

OCTAMER-BINDING TRANSCRIPTION FACTOR 1 ; X-RAY DIFFRACTION 1.900Å

e1k61A1[A:132-191] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MATING-TYPE PROTEIN ALPHA-2 ; X-RAY DIFFRACTION 2.1Å

e1p7iA1[A:3-55] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Segmentation polarity homeobox protein engrailed ; ligands: NHE ; X-RAY DIFFRACTION 2.1Å

e6es3K1[K:184-255] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein CDX-2 ; X-RAY DIFFRACTION 2.180Å

e6es2K1[K:187-256] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein CDX-2 ; X-RAY DIFFRACTION 2.950Å

e6es2L1[L:186-255] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein CDX-2 ; X-RAY DIFFRACTION 2.950Å

e6es3M1[M:184-255] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein CDX-2 ; X-RAY DIFFRACTION 2.180Å

e5zjqA1[A:12-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein abdominal-B ; X-RAY DIFFRACTION 2.443Å

e6dfyC1[C:9-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 2.62Å

e6dfyD1[D:10-61] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 2.62Å

e5zjrA1[A:12-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein abdominal-B ; X-RAY DIFFRACTION 3.03Å

e5zjsA1[A:21-77] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein abdominal-B ; X-RAY DIFFRACTION 2.896Å

e5zjtA1[A:10-77] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein abdominal-B ; X-RAY DIFFRACTION 2.4Å

e5zjtE1[E:21-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein abdominal-B ; X-RAY DIFFRACTION 2.4Å

e5zfyA1[A:79-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4-like protein 4 ; X-RAY DIFFRACTION 2.3Å

e5zfyA2[A:18-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4-like protein 4 ; X-RAY DIFFRACTION 2.3Å

e6a8rB1[B:2-59] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 1.6Å

e5z6zA2[A:79-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 2.25Å

e5zfwA2[A:79-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4-like protein 4 ; X-RAY DIFFRACTION 2.1Å

e5zfzA1[A:79-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4-like protein 4 ; X-RAY DIFFRACTION 1.9Å

e5z6zA1[A:19-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 2.25Å

e5zfwA1[A:19-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4-like protein 4 ; X-RAY DIFFRACTION 2.1Å

e5zfzA2[A:19-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4-like protein 4 ; X-RAY DIFFRACTION 1.9Å

e6a8rA1[A:2-59] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 1.6Å

e6e8cA2[A:79-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 2.12Å

e6e8cA1[A:16-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 2.12Å

e6fvcA1[A:1-64] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Segmentation polarity homeobox protein engrailed ; SOLUTION NMR

e6u81A2[A:79-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; ligands: EDO ; X-RAY DIFFRACTION 2.31Å

e6u82A2[A:79-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 3.2Å

e6u82D1[D:79-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 3.2Å

e6u81A1[A:19-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 2.31Å

e6u82A1[A:19-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 3.2Å

e6u82D2[D:17-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4 ; X-RAY DIFFRACTION 3.2Å

e6ry3A1[A:39-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; ligands: ACE,SO4 ; X-RAY DIFFRACTION 1.374Å

e6rydB1[B:37-95] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 1.575Å

e6rydE1[E:34-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 1.575Å

e6rydF1[F:38-95] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 1.575Å

e6ryiA1[A:37-95] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.69Å

e6ryiB1[B:37-95] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.69Å

e6ryiC1[C:37-96] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.69Å

e6ryiD1[D:37-96] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.69Å

e6ryiE1[E:37-96] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.69Å

e6rylA1[A:39-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.63Å

e6rylB1[B:37-100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.63Å

e6rylC1[C:37-100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.63Å

e6rylD1[D:37-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.63Å

e6rylE1[E:37-100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein WUSCHEL ; X-RAY DIFFRACTION 2.63Å

e6wc5I1[I:142-196] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein Nkx-2.5 ; X-RAY DIFFRACTION 2.9Å

e6wc5N1[N:140-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein Nkx-2.5 ; X-RAY DIFFRACTION 2.9Å

e6wc2M1[M:142-195] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein Nkx-2.5 ; X-RAY DIFFRACTION 2.1Å

e6wc2N1[N:142-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein Nkx-2.5 ; X-RAY DIFFRACTION 2.1Å

e6wc2O1[O:143-195] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Homeobox protein Nkx-2.5 ; X-RAY DIFFRACTION 2.1Å

e7dw5A1[A:82-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4-like protein 2 ; X-RAY DIFFRACTION 2.83Å

e7dw5B1[B:82-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Double homeobox protein 4-like protein 2 ; X-RAY DIFFRACTION 2.83Å

e7xrcC2[C:506-563] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POU domain protein ; X-RAY DIFFRACTION 1.89Å

e7psxA1[A:217-277] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein Hox-B13 ; X-RAY DIFFRACTION 1.970Å

e7psxB1[B:218-277] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein Hox-B13 ; X-RAY DIFFRACTION 1.970Å

e7psxG1[G:217-276] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein Hox-B13 ; X-RAY DIFFRACTION 1.970Å

e7psxJ1[J:218-275] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein Hox-B13 ; X-RAY DIFFRACTION 1.970Å

e7q3oK1[K:183-243] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein CDX-1 ; X-RAY DIFFRACTION 2.780Å

e7q3oC1[C:183-245] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein CDX-1 ; X-RAY DIFFRACTION 2.780Å

e7q3oE1[E:185-244] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein CDX-1 ; X-RAY DIFFRACTION 2.780Å

e7q3oG1[G:183-243] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein CDX-1 ; X-RAY DIFFRACTION 2.780Å

e7q4nC1[C:189-251] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein CDX-2 ; X-RAY DIFFRACTION 3.030Å

e7q4nK1[K:187-252] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein CDX-2 ; X-RAY DIFFRACTION 3.030Å

e8g87X1[X:229-288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POU domain, class 5, transcription factor 1 ; ELECTRON MICROSCOPY

e8g88X2[X:229-288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POU domain, class 5, transcription factor 1 ; ELECTRON MICROSCOPY

e8g8bX2[X:229-288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POU domain, class 5, transcription factor 1 ; ELECTRON MICROSCOPY

e8g8eX2[X:229-288] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POU domain, class 5, transcription factor 1 ; ELECTRON MICROSCOPY

e8g8gX2[X:229-288] Image Pymol Jmol Links: PDB, SCOP, CATH

POU domain, class 5, transcription factor 1 ; ELECTRON MICROSCOPY

e8f36A1[A:1-62] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeotic protein ultrabithorax ; SOLUTION NMR

e8f37A1[A:1-62] Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox protein abdominal-A ; SOLUTION NMR

e8emlA1[A:205-262] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: PGE ; X-RAY DIFFRACTION 2.2Å

e7u0gK1[K:232-287] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8ejoA1[A:21-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; X-RAY DIFFRACTION 2.670Å

Previous

e1le8A1[A:74-126] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MATING-TYPE PROTEIN A-1 ; X-RAY DIFFRACTION 2.3Å

e1bw5A1[A:1-66] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INSULIN GENE ENHANCER PROTEIN ISL-1 ; SOLUTION NMR

e1fjlA1[A:0-64] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PAIRED PROTEIN ; X-RAY DIFFRACTION

e1s7eA1[A:103-152] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hepatocyte nuclear factor 6 ; SOLUTION NMR

e1uhsA1[A:1-72] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

homeodomain only protein ; SOLUTION NMR

e1vndA1[A:1-77] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VND/NK-2 PROTEIN ; SOLUTION NMR

e1x2mA1[A:8-59] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

LAG1 longevity assurance homolog 6 ; SOLUTION NMR

e2cufA1[A:8-89] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

FLJ21616 protein ; SOLUTION NMR

e2ecbA1[A:8-83] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Zinc fingers and homeoboxes protein 1 ; SOLUTION NMR

e2eccA1[A:1-76] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Homeobox and leucine zipper protein Homez ; SOLUTION NMR

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