X-group (possible homology)

4012 SSHS domain

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Ligands and drugs

439

Member domains

with ligand contacts (≤ 4 Å)

12.1% of members

with DrugDomain annotations

18.9% of members

with a DrugBank compound

1.8% of members

Aggregated over all current member domains of this group. Drug annotations come from DrugDomain; buffers and crystallization additives are excluded from the tables below.

Chemical profile

ClassyFire chemical superclasses of the ligands bound by this X-group's proteins, from DrugDomain annotations.

Proteins with classified ligands

Superclasses bound (of 23)

—

Superclasses per 20 proteins

fewer than 20 proteins: too few to compare at equal depth

The raw number of superclasses rises with the number of proteins sampled; the per-20 value compares X-groups at equal depth.

Superclass	Proteins	Expected	Ratio	Significance
Organic nitrogen compounds	1	0.3	3.53×	not tested
Homogeneous metal compounds	8	4.4	1.84×	not tested
Benzenoids	1	0.7	1.54×	not tested
Nucleosides, nucleotides, and analogues	1	2.5	0.41×	not tested

enriched (q < 0.05)depleted (q < 0.05)not significantnot tested (expected < 5)

Unit: a protein (UniProt accession) with a ligand-binding domain in this X-group, counted once per superclass. Expected counts use each superclass's frequency across all ligand-binding X-groups; significance is Fisher's exact test with Benjamini–Hochberg correction. Buffers and crystallization additives are excluded. ECOD v295.2; the method follows the ECOD 2027 update, whose published figures used a slightly different artifact filter.

DrugBank compounds

DrugBank	PDB ligand	Name	Domains
DB03566	SPD	Spermidine	1
DB08651	TSP	3'-THIO-THYMIDINE-5'-PHOSPHATE	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
MGmetal	MAGNESIUM ION	29
Kmetal	POTASSIUM ION	6
ASW	N-[4-(acridin-9-ylamino)-3-methoxyphenyl]methanesulfonamide	4
EVP	(5S,5aR,8aR,9R)-9-(4-hydroxy-3,5-dimethoxyphenyl)-8-oxo-5,5a,6,8,8a,9-hexahydrofuro[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yl 4,6-O-[(1R)-ethylidene]-beta-D-glucopyranoside	4
CAmetal	CALCIUM ION	3
IL1	4-[[4-[[5-[[(2S)-2-[[5-[(4-cyanophenyl)carbonylamino]pyridin-2-yl]carbonylamino]-3-(1H-1,2,3-triazol-4-yl)propanoyl]amino]pyridin-2-yl]carbonylamino]-2-oxidanyl-3-propan-2-yloxy-phenyl]carbonylamino]benzoic acid	2
BWH	albicidin	1
IM0	4-[[3-(2-azanylethoxy)-2-oxidanyl-4-[[5-[[(2~{S})-2-[[4-[(6-oxidanylnaphthalen-2-yl)carbonylamino]phenyl]carbonylamino]-3-(1~{H}-1,2,3-triazol-4-yl)propanoyl]amino]pyridin-2-yl]carbonylamino]phenyl]carbonylamino]-3-methoxy-2-oxidanyl-benzoic acid	1
SPD	SPERMIDINE	1
TSP	3'-THIO-THYMIDINE-5'-PHOSPHATE	1
ZNmetal	ZINC ION	1