X-group (possible homology)

608 AhpD-like

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Ligands and drugs

575

Member domains

186

with ligand contacts (≤ 4 Å)

32.3% of members

108

with DrugDomain annotations

18.8% of members

with a DrugBank compound

15.0% 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
Organohalogen compounds	1	0.0	51×	not tested
Organosulfur compounds	1	0.1	7.04×	not tested
Organic acids and derivatives	3	1.1	2.81×	not tested
Homogeneous non-metal compounds	3	1.5	2.02×	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
DB00149	LEU	Leucine	10
DB14475	2OP	L-Lactic acid	6
DB19180	K94	NV-5138	5
DB03345	BME	Mercaptoethanol	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
FAD	FLAVIN-ADENINE DINUCLEOTIDE	72
LEU	LEUCINE	10
RCI	(R)-2-Chloropropionic acid	8
UNL	Unknown ligand	8
2OP	(2S)-2-HYDROXYPROPANOIC ACID	6
B2P	2-bromo-2-methylpropanoic acid	6
PEO	HYDROGEN PEROXIDE	6
K94	4-(difluoromethyl)-L-leucine	5
CL	CHLORIDE ION	4
NAmetal	SODIUM ION	3
BME	BETA-MERCAPTOETHANOL	2
LYS	LYSINE	2
MKV	2,3,4-tribromo-1H-pyrrole	1