ECOD
X-group (possible homology)

5035 Photosystem II reaction center protein I, PsbI

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Ligands and drugs

463
Member domains
339
with ligand contacts (≤ 4 Å)
73.2% of members
245
with DrugDomain annotations
52.9% of members
239
with a DrugBank compound
51.6% 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.

16
Proteins with classified ligands
6
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.

SuperclassProteinsExpected
0.25×observed / expected4×
RatioSignificance
Homogeneous metal compounds07.70q = 1.2e-4
Lipids and lipid-like molecules161.89.11×not tested
Hydrocarbons10.19.07×not tested
Organoheterocyclic compounds152.46.18×not tested
Organic nitrogen compounds10.51.99×not tested
Organic acids and derivatives12.40.41×not tested
Organic oxygen compounds13.10.32×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

DrugBankPDB ligandNameDomains
DB06755BCRBeta carotene234
DB02133CLAChlorophyll A172
DB03426DGDDigalactosyl Diacyl Glycerol (Dgdg)77
DB03193STEStearic acid26
DB02043LHG1,2-Dipalmitoyl-Phosphatidyl-Glycerole14
DB04038ERGErgosterol6
DB04735MGEMonogalactosyldiacylglycerol6
DB04450HTGHeptyl 1-Thiohexopyranoside5
DB00132LNLalpha-Linolenic acid2
DB04464FMEN-Formylmethionine1

Most frequently bound compounds

PDB ligandNameDomains in contact
CLACHLOROPHYLL A333
BCRBETA-CAROTENE315
LMG1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE311
UNLUnknown ligand98
DGDDIGALACTOSYL DIACYL GLYCEROL (DGDG)76
LHG1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE32
STESTEARIC ACID29
SQD1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL17
DGADIACYL GLYCEROL12
8CT(6'R,11cis,11'cis,13cis,15cis)-4',5'-didehydro-5',6'-dihydro-beta,beta-carotene11
SPHSPHINGOSINE9
4RFTripalmitoylglycerol8
LFAEICOSANE8
CL7CHLOROPHYLL D6
ERGERGOSTEROL5
HTGheptyl 1-thio-beta-D-glucopyranoside5
MGE(1S)-2-(ALPHA-L-ALLOPYRANOSYLOXY)-1-[(TRIDECANOYLOXY)METHYL]ETHYL PALMITATE5
LNLALPHA-LINOLENIC ACID4
PLMPALMITIC ACID4
WVN1,3,3-trimethyl-2-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-3,7,12,16-tetramethyl-18-[(1R)-2,6,6-trimethylcyclohex-2-en-1-yl]octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohexene4