X-group (possible homology)

278 Succinate dehydrogenase/fumarate reductase flavoprotein, catalytic domain

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Ligands and drugs

509

Member domains

235

with ligand contacts (≤ 4 Å)

46.2% of members

222

with DrugDomain annotations

43.6% of members

220

with a DrugBank compound

43.2% 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)

7.0

Superclasses per 20 proteins

narrower than 60% of the 256 X-groups with enough proteins to compare (median 7.6)

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
Nucleosides, nucleotides, and analogues	26	7.4	3.53×	q < 0.0001
Homogeneous non-metal compounds	6	5.7	1.05×	q = 0.87
Homogeneous metal compounds	7	13.1	0.54×	q = 0.04
Organic oxygen compounds	0	5.3	0	q = 0.01
Organic 1,3-dipolar compounds	3	0.0	135×	not tested
Organic acids and derivatives	17	4.1	4.13×	not tested
Lipids and lipid-like molecules	6	3.0	2.02×	not tested
Organoheterocyclic compounds	4	4.1	0.98×	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
DB03147	FAD	Flavin adenine dinucleotide	216
DB01677	FUM	Fumaric acid	29
DB03343	TEO	Malate Like Intermediate	27
DB02637	OAA	Oxaloacetate Ion	23
DB18267	HEM	Ferroheme	18
DB07373	ANB	Boldione	9
DB00139	SIN	Succinic acid	6
DB03317	HEC	Ferroheme C	5
DB02175	MLA	Malonic acid	4
DB00131	AMP	Adenosine phosphate	2
DB01536	ASD	Androstenedione	2
DB03553	GUA	Glutaric Acid	2
DB00128	ASP	Aspartic acid	1
DB01971	URO	trans-urocanic acid	1
DB03247	FMN	Flavin mononucleotide	1
DB03708	ADX	Adenosine 5'-phosphosulfate	1
DB04141	—	2-Hexyloxy-6-Hydroxymethyl-Tetrahydro-Pyran-3,4,5-Triol	1
DB04657	—	Carboxin	1
DB04795	—	Thenoyltrifluoroacetone	1
DB08689	—	Ubiquinone Q1	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
FAD	FLAVIN-ADENINE DINUCLEOTIDE	226
NAmetal	SODIUM ION	58
FUM	FUMARIC ACID	27
TEO	MALATE LIKE INTERMEDIATE	27
OAA	OXALOACETATE ION	23
Kmetal	POTASSIUM ION	19
HEM	PROTOPORPHYRIN IX CONTAINING FE	17
CL	CHLORIDE ION	12
UNL	Unknown ligand	12
ANB	ANDROSTA-1,4-DIENE-3,17-DIONE	10
SIN	SUCCINIC ACID	7
CAmetal	CALCIUM ION	6
MLA	MALONIC ACID	4
SFD	(S)-10-((2S,3S,4R)-5-((S)-((S)-(((2R,3S,4R,5R)-5-(6-AMINO-9H-PURIN-9-YL)-3,4-DIHYDROXY-TETRAHYDROFURAN-2-YL)METHOXY)(HYDROXY)PHOSPHORYLOXY)(HYDROXY)PHOSPHORYLOXY)-2,3,4-TRIHYDROXYPENTYL)-7,8-DIMETHYL-2,4-DIOXO-2,3,4,4A-TETRAHYDROBENZO[G]PTERIDINE-5(10H)-SULFONIC ACID	4
3NP	3-NITROPROPANOIC ACID	3
ADX	ADENOSINE-5'-PHOSPHOSULFATE	2
AMP	ADENOSINE MONOPHOSPHATE	2
ASD	4-ANDROSTENE-3-17-DIONE	2
GUA	GLUTARIC ACID	2
HEC	HEME C	2