PAH2 domain superfamily

SCOP classification

• Root: SCOP hierarchy in SUPERFAMILY [ 0] (11)
• Class: All alpha proteins [ 46456] (284)
• Fold: PAH2 domain [ 47761]
• Superfamily: PAH2 domain [ 47762]
• Families: PAH2 domain [ 47763] (2)

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Superfamily statistics

	Genomes (460)	Uniprot 2018_03 genome	PDB chains (SCOP 1.75)
Domains	3,511	9,433	3
Proteins	1,558	4,138	3

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Functional annotation

• General category: Regulation
• Detailed category: DNA-binding

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Xenopus Anatomy (XA)

Highlighted in gray are those with FDR_all>0.001

	XA term	FDR (all)	IC level	SDXA level	Annotation (direct or inherited)
Xenopus ANatomical entity (XAN)	head region	0	0.5108	--	DIRECT
Xenopus ANatomical entity (XAN)	trunk region	0	0.4287	--	DIRECT
Xenopus ANatomical entity (XAN)	genital system	0	0.5909	--	DIRECT
Xenopus ANatomical entity (XAN)	male genitalia	0	0.8318	--	DIRECT
Xenopus ANatomical entity (XAN)	central nervous system	0	0.6506	--	DIRECT
Xenopus ANatomical entity (XAN)	anatomical structure	0	0	--	DIRECT
Xenopus ANatomical entity (XAN)	anatomical group	0	0.1442	--	DIRECT
Xenopus ANatomical entity (XAN)	male organism	0	0.8318	--	DIRECT
Xenopus ANatomical entity (XAN)	primary germ layer	0	0.7237	--	DIRECT
Xenopus ANatomical entity (XAN)	cell	0	0.7974	--	DIRECT
Xenopus ANatomical entity (XAN)	organism subdivision	0	0.1871	--	DIRECT
Xenopus ANatomical entity (XAN)	compound organ	0	0.24	--	DIRECT
Xenopus ANatomical entity (XAN)	egg	0	1.17	--	DIRECT
Xenopus ANatomical entity (XAN)	gonad	0	0.8318	--	DIRECT
Xenopus ANatomical entity (XAN)	gamete	0	1.17	--	DIRECT
Xenopus ANatomical entity (XAN)	anatomical cluster	0	0.7974	--	DIRECT
Xenopus ANatomical entity (XAN)	anatomical region	0	0.193	--	DIRECT
Xenopus ANatomical entity (XAN)	multicellular anatomical structure	0	0.1217	--	DIRECT
Xenopus ANatomical entity (XAN)	anatomical system	1	0.3094	--	INHERITED FROM: testis || alimentary system || urogenital system || intestine || nervous system || brain || egg || genital system || male genitalia || central nervous system || gamete
Xenopus ANatomical entity (XAN)	whole organism	1	0.09747	--	INHERITED FROM: urogenital system || head region || genital system || brain || egg || intestine || nervous system || alimentary system || anatomical group || testis || cavitated compound organ || multicellular anatomical structure || gonad || ectoderm || compound organ || trunk || tissue || anatomical region || germ cell || central nervous system || male genitalia || gamete || trunk region || anatomical cluster || viscus || male organism || endomesoderm || organism subdivision || cell || head || primary germ layer
Xenopus ANatomical entity (XAN)	embryo	0	0.6341	Least Informative	DIRECT
Xenopus ANatomical entity (XAN)	urogenital system	0	0.5011	Least Informative	DIRECT
Xenopus ANatomical entity (XAN)	nervous system	0	0.6341	Least Informative	DIRECT
Xenopus ANatomical entity (XAN)	head	0	0.5108	Least Informative	DIRECT
Xenopus ANatomical entity (XAN)	trunk	0	0.4308	Least Informative	DIRECT
Xenopus ANatomical entity (XAN)	tissue	0	0.5011	Least Informative	DIRECT
Xenopus ANatomical entity (XAN)	cavitated compound organ	0	0.3033	Least Informative	DIRECT
Xenopus ANatomical entity (XAN)	ectoderm	0	0.9688	Moderately Informative	DIRECT
Xenopus ANatomical entity (XAN)	brain	0	0.8635	Moderately Informative	DIRECT
Xenopus ANatomical entity (XAN)	germ cell	0	1.013	Moderately Informative	DIRECT
Xenopus ANatomical entity (XAN)	alimentary system	0	0.955	Moderately Informative	DIRECT
Xenopus ANatomical entity (XAN)	testis	0	0.8318	Moderately Informative	DIRECT
Xenopus ANatomical entity (XAN)	viscus	0	0.9618	Moderately Informative	DIRECT
Xenopus ANatomical entity (XAN)	intestine	0	1.363	Informative	DIRECT
Xenopus ANatomical entity (XAN)	endomesoderm	0	1.256	Informative	DIRECT
Xenopus DEvelopment stage (XDE)	tadpole stage	0	0.5946	--	DIRECT
Xenopus DEvelopment stage (XDE)	NF stage	0	0.02327	--	DIRECT
Xenopus DEvelopment stage (XDE)	post-embryonic stage	0	0.5693	Least Informative	DIRECT
Xenopus DEvelopment stage (XDE)	unspecified stage	0	1.131	Moderately Informative	DIRECT

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Arabidopsis Plant Ontology (AP)

Highlighted in gray are those with FDR_all>0.001

	AP term	FDR (all)	IC level	SDAP level	Annotation (direct or inherited)
Plant ANatomical entity (PAN)	plant cell	0	0.1489	--	DIRECT
Plant ANatomical entity (PAN)	plant structure	1	0	--	INHERITED FROM: plant cell
Plant structure DEvelopment stage (PDE)	whole plant development stage	0	0.1968	--	DIRECT
Plant structure DEvelopment stage (PDE)	1 main shoot growth stage	0	0.3937	--	DIRECT
Plant structure DEvelopment stage (PDE)	leaf production stage	0	0.3937	--	DIRECT
Plant structure DEvelopment stage (PDE)	sporophyte vegetative stage	0	0.2036	--	DIRECT
Plant structure DEvelopment stage (PDE)	floral organ differentiation stage	0	0.0937	--	DIRECT
Plant structure DEvelopment stage (PDE)	corolla development stage	0	0.1981	--	DIRECT
Plant structure DEvelopment stage (PDE)	flowering stage	0	0.2162	--	DIRECT
Plant structure DEvelopment stage (PDE)	plant embryo stage	0	0.2833	--	DIRECT
Plant structure DEvelopment stage (PDE)	collective plant organ structure development stage	0	0.03771	--	DIRECT
Plant structure DEvelopment stage (PDE)	plant organ development stage	0	0.08108	--	DIRECT
Plant structure DEvelopment stage (PDE)	reproductive shoot system development stage	0	0.05008	--	DIRECT
Plant structure DEvelopment stage (PDE)	collective phyllome structure development stage	0	0.0937	--	DIRECT
Plant structure DEvelopment stage (PDE)	floral organ formation stage	0	0.0937	--	DIRECT
Plant structure DEvelopment stage (PDE)	flower development stage	1	0.07083	--	INHERITED FROM: corolla development stage || flowering stage || floral organ differentiation stage || floral organ formation stage
Plant structure DEvelopment stage (PDE)	life of whole plant stage	1	0.2022	--	INHERITED FROM: sporophyte vegetative stage || C globular stage || E expanded cotyledon stage || LP.04 four leaves visible stage || D bilateral stage || plant embryo stage || leaf production stage || 1 main shoot growth stage
Plant structure DEvelopment stage (PDE)	shoot system development stage	1	0.04053	--	INHERITED FROM: reproductive shoot system development stage || floral organ formation stage || floral organ differentiation stage || flowering stage || corolla development stage || plant organ development stage
Plant structure DEvelopment stage (PDE)	sporophyte development stage	1	0.2022	--	INHERITED FROM: E expanded cotyledon stage || sporophyte vegetative stage || C globular stage || leaf production stage || 1 main shoot growth stage || D bilateral stage || LP.04 four leaves visible stage || plant embryo stage
Plant structure DEvelopment stage (PDE)	E expanded cotyledon stage	0	0.353	Least Informative	DIRECT
Plant structure DEvelopment stage (PDE)	C globular stage	0	0.3937	Least Informative	DIRECT
Plant structure DEvelopment stage (PDE)	D bilateral stage	0	0.3729	Least Informative	DIRECT
Plant structure DEvelopment stage (PDE)	LP.04 four leaves visible stage	0	0.4338	Least Informative	DIRECT

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InterPro annotation

• Cross references: IPR003822 SSF47762 Protein matches
• Abstract:

  This family contains the paired amphipathic helix (PAH) repeat. The family contains the eukaryotic Sin3 proteins, which have at least three PAH domains (PAH1, PAH2, and PAH3). Sin3 proteins are components of a co-repressor complex that silences transcription, playing important roles in the transition between proliferation and differentiation. Sin3 proteins are recruited to the DNA by various DNA-binding transcription factors such as the Mad family of repressors, Mnt/Rox, PLZF, MeCP2, p53, REST/NRSF, MNFbeta, Sp1, TGIF and Ume6 [11101889]. Sin3 acts as a scaffold protein that in turn recruits histone-binding proteins RbAp46/RbAp48 and histone deacetylases HDAC1/HDAC2, which deacetylate the core histones resulting in a repressed state of the chromatin [14705930]. The PAH domains are protein-protein interaction domains through which Sin3 fulfils its role as a scaffold. The PAH2 domain of Sin3 can interact with a wide range of unrelated and structurally diverse transcription factors that bind using different interaction motifs. For example, the Sin3 PAH2 domain can interact with the unrelated Mad and HBP1 factors using alternative interaction motifs that involve binding in opposite helical orientations [15235594].

InterPro database

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