2PRZ - JenaLib

Asymmetric Unit (Jmol Viewer)

Asym. Unit - sites (Jmol Viewer)

Biological Unit 1 (Jmol Viewer)

Biol. Unit 1 - sites (Jmol Viewer)

Biological Unit 2 (Jmol Viewer)

Title :   S. CEREVISIAE OROTATE PHOSPHORIBOSYLTRANSFERASE COMPLEXED WITH OMP

Authors :   L. Gonzalez-Segura, T. D. Hurley, R. W. Mcclard

Date :   04 May 07 (Deposition) - 15 Jan 08 (Release) - 24 Feb 09 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   1.90

Chains :   Asym. Unit : A,B,C,D
Biol. Unit 1: A,B  (1x)
Biol. Unit 2: C,D  (1x)

Keywords :   Alpha Beta, Oprtase-Omp Complex, Transferase (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   L. Gonzalez-Segura, J. F. Witte, R. W. Mcclard, T. D. Hurley
Ternary Complex Formation And Induced Asymmetry In Orotate Phosphoribosyltransferase.
Biochemistry V. 46 14075 2007
PubMed-ID: 18020427 | Reference-DOI: 10.1021/BI701023Z
(for further references see the PDB file header)

Molecule 1 - OROTATE PHOSPHORIBOSYLTRANSFERASE 1
	Chains	:	A, B, C, D
	EC Number	:	2.4.2.10
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PREJ2
	Expression System Strain	:	CS101-4UI
	Expression System Taxid	:	562
	Expression System Vector Type	:	PTRC99A
	Gene	:	URA5, PYR5
	Organism Common	:	BAKER'S YEAST
	Organism Scientific	:	SACCHAROMYCES CEREVISIAE
	Organism Taxid	:	4932
	Synonym	:	OPRT 1, OPRTASE 1

		1	2	3	4
Asymmetric Unit	:	A	B	C	D
Biological Unit 1 (1x)	:	A	B
Biological Unit 2 (1x)	:			C	D

Summary Information (see also Sequences/Alignments below)

Asymmetric Unit (2, 8)

No.	Name	Count	Type	Full Name
1	CL	4	Ligand/Ion	CHLORIDE ION
2	OMP	4	Ligand/Ion	OROTIDINE-5'-MONOPHOSPHATE

Biological Unit 1 (1, 2)

No.	Name	Count	Type	Full Name
1	CL	-1	Ligand/Ion	CHLORIDE ION
2	OMP	2	Ligand/Ion	OROTIDINE-5'-MONOPHOSPHATE

Biological Unit 2 (1, 2)

No.	Name	Count	Type	Full Name
1	CL	-1	Ligand/Ion	CHLORIDE ION
2	OMP	2	Ligand/Ion	OROTIDINE-5'-MONOPHOSPHATE

Asymmetric Unit (8, 8)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	TYR A:75 , LYS A:76 , ARG B:105	BINDING SITE FOR RESIDUE CL A 1
2	AC2	SOFTWARE	TYR C:75 , LYS C:76	BINDING SITE FOR RESIDUE CL C 2
3	AC3	SOFTWARE	ARG C:105 , TYR D:75 , LYS D:76	BINDING SITE FOR RESIDUE CL D 225
4	AC4	SOFTWARE	ARG A:105 , TYR B:75 , LYS B:76	BINDING SITE FOR RESIDUE CL B 225
5	AC5	SOFTWARE	LEU A:28 , LYS A:29 , PHE A:37 , PHE A:38 , ASP A:132 , VAL A:133 , MET A:134 , THR A:135 , ALA A:136 , GLY A:137 , THR A:138 , ALA A:139 , ARG A:163 , HOH A:453 , HOH A:457 , HOH A:458 , HOH A:465 , HOH A:482 , HOH A:501	BINDING SITE FOR RESIDUE OMP A 450
6	AC6	SOFTWARE	LEU B:28 , LYS B:29 , PHE B:37 , PHE B:38 , ASP B:132 , VAL B:133 , MET B:134 , THR B:135 , ALA B:136 , GLY B:137 , THR B:138 , ALA B:139 , ARG B:163 , HOH B:554 , HOH B:559 , HOH B:560 , HOH B:577	BINDING SITE FOR RESIDUE OMP B 550
7	AC7	SOFTWARE	LEU C:28 , LYS C:29 , PHE C:37 , PHE C:38 , ASP C:132 , VAL C:133 , MET C:134 , THR C:135 , ALA C:136 , GLY C:137 , THR C:138 , ALA C:139 , ARG C:163 , HOH C:652 , HOH C:654 , HOH C:671 , HOH C:698 , HOH C:718 , HOH C:728	BINDING SITE FOR RESIDUE OMP C 650
8	AC8	SOFTWARE	LEU D:28 , LYS D:29 , PHE D:37 , PHE D:38 , ASP D:132 , VAL D:133 , MET D:134 , THR D:135 , ALA D:136 , GLY D:137 , THR D:138 , ALA D:139 , ARG D:163 , HOH D:753 , HOH D:754 , HOH D:756 , HOH D:787 , HOH D:815 , HOH D:835	BINDING SITE FOR RESIDUE OMP D 750

(no "SS Bond" information available for 2PRZ)

Asymmetric Unit

No.	Residues
1	Ala A:74	-	Tyr A:75
2	Ala B:74	-	Tyr B:75
3	Ala C:74	-	Tyr C:75
4	Ala D:74	-	Tyr D:75

(no "SAP(SNP)/Variant" information available for 2PRZ)

Asymmetric Unit (1, 4)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	PUR_PYR_PR_TRANSFER	PS00103	Purine/pyrimidine phosphoribosyl transferases signature.	PYRE_YEAST	128-140	4	A:127-139 B:127-139 C:127-139 D:127-139

Biological Unit 1 (1, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	PUR_PYR_PR_TRANSFER	PS00103	Purine/pyrimidine phosphoribosyl transferases signature.	PYRE_YEAST	128-140	2	A:127-139 B:127-139 - -

Biological Unit 2 (1, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	PUR_PYR_PR_TRANSFER	PS00103	Purine/pyrimidine phosphoribosyl transferases signature.	PYRE_YEAST	128-140	2	- - C:127-139 D:127-139

Asymmetric Unit (1, 4)

	ENSEMBL					UniProtKB			PDB
No.	Transcript ID	Exon	Exon ID	Genome Location	Length	ID	Location	Length	Count	Location	Length
1.1	YML106W	1	YML106W.1	XIII:56773-57453	681	PYRE_YEAST	1-226	226	4	A:4-224 (gaps) B:2-224 (gaps) C:4-224 (gaps) D:2-224 (gaps)	221 223 221 223

Asymmetric Unit

Reformat:	Number of residues per line = ('0' or empty: single-line sequence representation)
	Number of residues per labelling interval =
	UniProt sequence: complete aligned part

Show mapping:	SCOP domains	CATH domains	Pfam domains	Secondary structure (by author)
	SAPs(SNPs)	PROSITE motifs	Exons
	(details for a mapped element are shown in a popup box when the mouse pointer rests over it)

Chain A from PDB  Type:PROTEIN  Length:215
 aligned with PYRE_YEAST | P13298 from UniProtKB/Swiss-Prot  Length:226

    Alignment length:221
                                    14        24        34        44        54        64        74        84        94       104       114       124       134       144       154       164       174       184       194       204       214       224 
           PYRE_YEAST     5 LEDYQKNFLELAIECQALRFGSFKLKSGRESPYFFNLGLFNTGKLLSNLATAYAIAIIQSDLKFDVIFGPAYKGIPLAAIVCVKLAEIGGSKFQNIQYAFNRKEAKDHGEGGIIVGSALENKRILIIDDVMTAGTAINEAFEIISNAKGQVVGSIIALDRQEVVSTDDKEGLSATQTVSKKYGIPVLSIVSLIHIITYLEGRITAEEKSKIEQYLQTYGAS 225
               SCOP domains d2prza_ A: automated matches                                                                                                                                                                                                  SCOP domains
               CATH domains 2przA00 A:4-224  [code=3.40.50.2020, no name defined]                                                                                                                                                                         CATH domains
               Pfam domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .hhhhhhhhhhhhhh..eeeeeee.....eeeeee.hhhh.hhhhhhhhhhhhhhhhhhh.....eeee...hhhhhhhhhhhhhhhhhhhhhh..eeeee....------..ee.......eeeeeeeee..hhhhhhhhhhhhhh..eeeeeeeeee.............hhhhhhhhhhh..eeeeeehhhhhhhh....hhhhhhhhhhhhhhhh.. Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ---------------------------------------------------------------------------------------------------------------------------PUR_PYR_PR_TR------------------------------------------------------------------------------------- PROSITE
               Transcript 1 Exon 1.1  PDB: A:4-224 (gaps) UniProt: 1-226 [INCOMPLETE]                                                                                                                                                                     Transcript 1
                 2prz A   4 LEDYQKNFLELAIECQALRFGSFKLKSGRESPYFFNLGLFNTGKLLSNLATAYAIAIIQSDLKFDVIFGPAYKGIPLAAIVCVKLAEIGGSKFQNIQYAFNRKEA------GIIVGSALENKRILIIDDVMTAGTAINEAFEIISNAKGQVVGSIIALDRQEVVSTDDKEGLSATQTVSKKYGIPVLSIVSLIHIITYLEGRITAEEKSKIEQYLQTYGAS 224
                                    13        23        33        43        53        63        73        83        93       103    |    - |     123       133       143       153       163       173       183       193       203       213       223 
                                                                                                                                  108    115

Chain B from PDB  Type:PROTEIN  Length:216
 aligned with PYRE_YEAST | P13298 from UniProtKB/Swiss-Prot  Length:226

    Alignment length:223
                                    12        22        32        42        52        62        72        82        92       102       112       122       132       142       152       162       172       182       192       202       212       222   
           PYRE_YEAST     3 IMLEDYQKNFLELAIECQALRFGSFKLKSGRESPYFFNLGLFNTGKLLSNLATAYAIAIIQSDLKFDVIFGPAYKGIPLAAIVCVKLAEIGGSKFQNIQYAFNRKEAKDHGEGGIIVGSALENKRILIIDDVMTAGTAINEAFEIISNAKGQVVGSIIALDRQEVVSTDDKEGLSATQTVSKKYGIPVLSIVSLIHIITYLEGRITAEEKSKIEQYLQTYGAS 225
               SCOP domains d2przb_ B: automated matches                                                                                                                                                                                                    SCOP domains
               CATH domains 2przB00 B:2-224  [code=3.40.50.2020, no name defined]                                                                                                                                                                           CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhhhhhhhhh..eeeeeee.....eeeeee.hhhh.hhhhhhhhhhhhhhhhhhhh....eee....hhhhhhhhhhhhhhhhhhhhhh..eeeee....-------.ee.......eeeeeeeee..hhhhhhhhhhhhhh..eeeeeeeeee.............hhhhhhhhhhh..eeeeeehhhhhhhhhhhhhhhhhhhhhhhhhhhh.. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------PUR_PYR_PR_TR------------------------------------------------------------------------------------- PROSITE
               Transcript 1 Exon 1.1  PDB: B:2-224 (gaps) UniProt: 1-226 [INCOMPLETE]                                                                                                                                                                       Transcript 1
                 2prz B   2 IMLEDYQKNFLELAIECQALRFGSFKLKSGRESPYFFNLGLFNTGKLLSNLATAYAIAIIQSDLKFDVIFGPAYKGIPLAAIVCVKLAEIGGSKFQNIQYAFNRKEA-------IIVGSALENKRILIIDDVMTAGTAINEAFEIISNAKGQVVGSIIALDRQEVVSTDDKEGLSATQTVSKKYGIPVLSIVSLIHIITYLEGRITAEEKSKIEQYLQTYGAS 224
                                    11        21        31        41        51        61        71        81        91       101      |  -    |  121       131       141       151       161       171       181       191       201       211       221   
                                                                                                                                    108     116

Chain C from PDB  Type:PROTEIN  Length:215
 aligned with PYRE_YEAST | P13298 from UniProtKB/Swiss-Prot  Length:226

    Alignment length:221
                                    14        24        34        44        54        64        74        84        94       104       114       124       134       144       154       164       174       184       194       204       214       224 
           PYRE_YEAST     5 LEDYQKNFLELAIECQALRFGSFKLKSGRESPYFFNLGLFNTGKLLSNLATAYAIAIIQSDLKFDVIFGPAYKGIPLAAIVCVKLAEIGGSKFQNIQYAFNRKEAKDHGEGGIIVGSALENKRILIIDDVMTAGTAINEAFEIISNAKGQVVGSIIALDRQEVVSTDDKEGLSATQTVSKKYGIPVLSIVSLIHIITYLEGRITAEEKSKIEQYLQTYGAS 225
               SCOP domains d2przc_ C: automated matches                                                                                                                                                                                                  SCOP domains
               CATH domains 2przC00 C:4-224  [code=3.40.50.2020, no name defined]                                                                                                                                                                         CATH domains
               Pfam domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .hhhhhhhhhhhhhh..eeeeeee.....eeeeee.hhhh.hhhhhhhhhhhhhhhhhhh.....eeee...hhhhhhhhhhhhhhhhhhhhhh..eeeee....------..ee.......eeeeeeeee..hhhhhhhhhhhhhh..eeeeeeeeee.............hhhhhhhhhhh..eeeeeehhhhhhhh....hhhhhhhhhhhhhhhh.. Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ---------------------------------------------------------------------------------------------------------------------------PUR_PYR_PR_TR------------------------------------------------------------------------------------- PROSITE
               Transcript 1 Exon 1.1  PDB: C:4-224 (gaps) UniProt: 1-226 [INCOMPLETE]                                                                                                                                                                     Transcript 1
                 2prz C   4 LEDYQKNFLELAIECQALRFGSFKLKSGRESPYFFNLGLFNTGKLLSNLATAYAIAIIQSDLKFDVIFGPAYKGIPLAAIVCVKLAEIGGSKFQNIQYAFNRKEA------GIIVGSALENKRILIIDDVMTAGTAINEAFEIISNAKGQVVGSIIALDRQEVVSTDDKEGLSATQTVSKKYGIPVLSIVSLIHIITYLEGRITAEEKSKIEQYLQTYGAS 224
                                    13        23        33        43        53        63        73        83        93       103    |    - |     123       133       143       153       163       173       183       193       203       213       223 
                                                                                                                                  108    115

Chain D from PDB  Type:PROTEIN  Length:217
 aligned with PYRE_YEAST | P13298 from UniProtKB/Swiss-Prot  Length:226

    Alignment length:223
                                    12        22        32        42        52        62        72        82        92       102       112       122       132       142       152       162       172       182       192       202       212       222   
           PYRE_YEAST     3 IMLEDYQKNFLELAIECQALRFGSFKLKSGRESPYFFNLGLFNTGKLLSNLATAYAIAIIQSDLKFDVIFGPAYKGIPLAAIVCVKLAEIGGSKFQNIQYAFNRKEAKDHGEGGIIVGSALENKRILIIDDVMTAGTAINEAFEIISNAKGQVVGSIIALDRQEVVSTDDKEGLSATQTVSKKYGIPVLSIVSLIHIITYLEGRITAEEKSKIEQYLQTYGAS 225
               SCOP domains d2przd_ D: automated matches                                                                                                                                                                                                    SCOP domains
               CATH domains 2przD00 D:2-224  [code=3.40.50.2020, no name defined]                                                                                                                                                                           CATH domains
           Pfam domains (1) --------------------------------------Pribosyltran-2przD01 D:40-161                                                                                             --------------------------------------------------------------- Pfam domains (1)
           Pfam domains (2) --------------------------------------Pribosyltran-2przD02 D:40-161                                                                                             --------------------------------------------------------------- Pfam domains (2)
           Pfam domains (3) --------------------------------------Pribosyltran-2przD03 D:40-161                                                                                             --------------------------------------------------------------- Pfam domains (3)
           Pfam domains (4) --------------------------------------Pribosyltran-2przD04 D:40-161                                                                                             --------------------------------------------------------------- Pfam domains (4)
         Sec.struct. author ...hhhhhhhhhhhhhh..eeeeeee.....eeeeee.hhhh.hhhhhhhhhhhhhhhhhhhh....eeee...hhhhhhhhhhhhhhhhhhhhhh..eeeee....------..ee.......eeeeeeeee..hhhhhhhhhhhhhh..eeeeeeeeee.............hhhhhhhhhh...eeeeeehhhhhhhhhhhhhhhhhhhhhhhhhhhh.. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------PUR_PYR_PR_TR------------------------------------------------------------------------------------- PROSITE
               Transcript 1 Exon 1.1  PDB: D:2-224 (gaps) UniProt: 1-226 [INCOMPLETE]                                                                                                                                                                       Transcript 1
                 2prz D   2 IMLEDYQKNFLELAIECQALRFGSFKLKSGRESPYFFNLGLFNTGKLLSNLATAYAIAIIQSDLKFDVIFGPAYKGIPLAAIVCVKLAEIGGSKFQNIQYAFNRKEA------GIIVGSALENKRILIIDDVMTAGTAINEAFEIISNAKGQVVGSIIALDRQEVVSTDDKEGLSATQTVSKKYGIPVLSIVSLIHIITYLEGRITAEEKSKIEQYLQTYGAS 224
                                    11        21        31        41        51        61        71        81        91       101      |  -   |   121       131       141       151       161       171       181       191       201       211       221   
                                                                                                                                    108    115

Legend:		→ Mismatch	(orange background)
	-	→ Gap	(green background, '-', border residues have a numbering label)
		→ Modified Residue	(blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
	x	→ Chemical Group	(purple background, 'x', labelled with number + name, e.g. ACE or NH2)
	extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '\|'

Asymmetric Unit

Classes(

)

Folds(

)

Superfamilies( (-)

)

Families(

)

Protein Domains( (-)

)

Organisms( (-)

)

Class: Alpha and beta proteins (a/b) (23833)

Fold: PRTase-like (145)

Superfamily: PRTase-like (145)

Family: automated matches (39)

Protein domain: automated matches (39)

Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] (3)

1a	d2prza_	A:
1b	d2przb_	B:
1c	d2przc_	C:
1d	d2przd_	D:

Asymmetric Unit

Classes(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

)

Organisms( (-)

)

Class: Alpha Beta (26913)

Architecture: 3-Layer(aba) Sandwich (12045)

Topology: Rossmann fold (7312)

Homologous Superfamily: [code=3.40.50.2020, no name defined] (117)

Baker's yeast (Saccharomyces cerevisiae) (5)

1a	2przA00	A:4-224
1b	2przC00	C:4-224
1c	2przB00	B:2-224
1d	2przD00	D:2-224

Asymmetric Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: PRTase-like (59)

Family: Pribosyltran (59)

Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Bakers yeast) (6)

1a	Pribosyltran-2przD01	D:40-161
1b	Pribosyltran-2przD02	D:40-161
1c	Pribosyltran-2przD03	D:40-161
1d	Pribosyltran-2przD04	D:40-161

Asymmetric Unit(hide GO term definitions)

Chain A,B,C,D (PYRE_YEAST | P13298)

molecular function
	GO:0004588	orotate phosphoribosyltransferase activity	Catalysis of the reaction: orotidine 5'-phosphate + diphosphate = orotate + 5-phospho-alpha-D-ribose 1-diphosphate.
	GO:0016740	transferase activity	Catalysis of the transfer of a group, e.g. a methyl group, glycosyl group, acyl group, phosphorus-containing, or other groups, from one compound (generally regarded as the donor) to another compound (generally regarded as the acceptor). Transferase is the systematic name for any enzyme of EC class 2.
	GO:0016757	transferase activity, transferring glycosyl groups	Catalysis of the transfer of a glycosyl group from one compound (donor) to another (acceptor).
biological process
	GO:0044205	'de novo' UMP biosynthetic process	The chemical reactions and pathways resulting in the formation of UMP, uridine monophosphate, starting with the synthesis of (S)-dihydroorotate from bicarbonate; UMP biosynthesis may either occur via reduction by quinone, NAD(+) or oxygen.
	GO:0006207	'de novo' pyrimidine nucleobase biosynthetic process	The chemical reactions and pathways resulting in the formation of pyrimidine nucleobases, 1,3-diazine, organic nitrogenous bases, beginning with the synthesis of a pyrimidine ring from simpler precursors.
	GO:0009116	nucleoside metabolic process	The chemical reactions and pathways involving a nucleoside, a nucleobase linked to either beta-D-ribofuranose (a ribonucleoside) or 2-deoxy-beta-D-ribofuranose, (a deoxyribonucleoside), e.g. adenosine, guanosine, inosine, cytidine, uridine and deoxyadenosine, deoxyguanosine, deoxycytidine and thymidine (= deoxythymidine).
	GO:0006221	pyrimidine nucleotide biosynthetic process	The chemical reactions and pathways resulting in the formation of a pyrimidine nucleotide, a compound consisting of nucleoside (a pyrimidine base linked to a deoxyribose or ribose sugar) esterified with a phosphate group at either the 3' or 5'-hydroxyl group of the sugar.
	GO:0046132	pyrimidine ribonucleoside biosynthetic process	The chemical reactions and pathways resulting in the formation of any ribonucleoside, a nucleoside in which a pyrimidine base is linked to a ribose (beta-D-ribofuranose) molecule.

Asymmetric Unit
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	Cis Peptide Bonds
		Ala A:74 - Tyr A:75	[ RasMol ]
		Ala B:74 - Tyr B:75	[ RasMol ]
		Ala C:74 - Tyr C:75	[ RasMol ]
		Ala D:74 - Tyr D:75	[ RasMol ]

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Access by PDB/NDB ID
	2prz
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Access by UniProt ID/Accession number
	PYRE_YEAST \| P13298
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	2.4.2.10
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	PYRE_YEAST \| P13298
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UniProtKB/Swiss-Prot
	PYRE_YEAST \| P13298	:	2pry 2ps1 4wml 4wn3

2pry	THE SAME PROTEIN IN THE APO FORM
2ps1	THE SAME PROTEIN COMPLEXED WITH ORO AND PRPP

Description

Compounds

Structural Features

Chains, Units

Ligands, Modified Residues, Ions (2, 8)

Sites (8, 8)

SS Bonds (0, 0)

Cis Peptide Bonds (4, 4)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (0, 0)

PROSITE Motifs (1, 4)

Exons (1, 4)

Sequences/Alignments

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SCOP Domains (1, 4)

CATH Domains (1, 4)

Pfam Domains (1, 4)

Gene Ontology (8, 8)

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