X-group (possible homology)

269 Fibrinogen C-terminal domain-like

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Ligands and drugs

729

Member domains

362

with ligand contacts (≤ 4 Å)

49.7% of members

351

with DrugDomain annotations

48.1% of members

129

with a DrugBank compound

17.7% 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)

7.3

Superclasses per 20 proteins

narrower than 57% 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
Organic oxygen compounds	11	5.5	2.00×	q = 0.03
Homogeneous metal compounds	26	13.6	1.92×	q < 0.0001
Homogeneous non-metal compounds	3	5.9	0.51×	q = 0.32
Nucleosides, nucleotides, and analogues	0	7.6	0	q = 5.3e-4
Organic nitrogen compounds	2	0.9	2.27×	not tested
Organic acids and derivatives	3	4.3	0.70×	not tested
Lipids and lipid-like molecules	2	3.1	0.65×	not tested
Benzenoids	1	2.0	0.49×	not tested
Organoheterocyclic compounds	1	4.3	0.23×	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
DB00141	NAG	N-Acetylglucosamine	51
DB06151	SC2	Acetylcysteine	8
DB03740	NDG	N-acetyl-alpha-D-glucosamine	7
DB03128	ACH	Acetylcholine	5
DB03567	A2G	alpha-N-Acetyl-D-galactosamine	5
DB02379	BGC	Beta-D-Glucose	3
DB01593	—	—	2
DB02518	AYA	N-Acetylalanine	2
DB02590	ABE	Abequose	2
DB04265	SLB	N-acetyl-beta-neuraminic acid	2
DB14487	—	—	2
DB01872	ASG	2-deoxy-2-acetamido-beta-D-galactose-4-sulfate	1
DB02515	G3P	sn-glycerol 3-phosphate	1
DB03796	PLM	Palmitic Acid	1
DB03945	PC	N,N,N-Trimethyl-2-(phosphonooxy)ethanaminium	1
DB04866	—	Halofuginone	1
DB08231	MYR	Myristic acid	1
DB14533	—	—	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CAmetal	CALCIUM ION	339
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	60
P4C	O-ACETALDEHYDYL-HEXAETHYLENE GLYCOL	16
SC2	N-ACETYL-L-CYSTEINE	8
CL	CHLORIDE ION	7
NDG	2-acetamido-2-deoxy-alpha-D-glucopyranose	7
BM3	2-acetamido-2-deoxy-alpha-D-mannopyranose	6
SMmetal	SAMARIUM (III) ION	6
A2G	2-acetamido-2-deoxy-alpha-D-galactopyranose	5
ACH	ACETYLCHOLINE	5
GLA	alpha-D-galactopyranose	4
3LJ	2-amino-2-deoxy-6-O-sulfo-alpha-D-glucopyranose	3
3S6	prop-2-en-1-yl beta-D-galactofuranoside	2
ABE	alpha-D-Abequopyranose	2
AYA	N-ACETYLALANINE	2
KO2	prop-2-en-1-yl D-glycero-alpha-D-talo-oct-2-ulopyranosidonic acid	2
MAN	alpha-D-mannopyranose	2
ASG	2-acetamido-2-deoxy-4-O-sulfo-beta-D-galactopyranose	1
AXS	1-(4-fluorophenyl)-~{N}-[[(2~{R})-oxolan-2-yl]methyl]methanamine	1
BGC	beta-D-glucopyranose	1