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Title :   CRYSTAL STRUCTURE OF N-((2S)-5-(6-FLUORO-3-PYRIDINYL)-2,3-DIHYDRO-1H-INDEN-2-YL)-2-PROPANESULFONAMIDE IN COMPLEX WITH THE LIGAND BINDING DOMAIN OF THE HUMAN GLUA2 RECEPTOR

Authors :   S. E. Ward, M. Harries, L. Aldegheri, D. Andreotti, S. Ballantine, B. D. A. J. Harris, A. J. Harker, J. Lund, R. Melarange, A. Mingardi, C. Mookh J. Mosley, M. Neve, B. Oliosi, R. Profeta, K. J. Smith, P. W. Smith, S. Sp K. M. Thewlis, S. P. Yusaf

Date :   14 Jun 10 (Deposition) - 21 Jul 10 (Release) - 01 Jun 11 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   1.80

Chains :   Asym./Biol. Unit : A,B

Keywords :   Transport Protein, Ion Channel (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   S. E. Ward, M. Harries, L. Aldegheri, D. Andreotti, S. Ballantine, B. D. Bax, A. J. Harris, A. J. Harker, J. Lund, R. Melarange, A. Mingardi C. Mookherjee, J. Mosley, M. Neve, B. Oliosi, R. Profeta, K. J. Smith, P. W. Smith, S. Spada, K. M. Thewlis, S. P. Yusaf
Discovery Of N-[(2S)-5-(6-Fluoro-3-Pyridinyl)-2, 3- Dihydro-1H-Inden-2-Yl]-2-Propanesulfonamide, A Novel Clinical Ampa Receptor Positive Modulator.
J. Med. Chem. V. 53 5801 2010
PubMed-ID: 20614889 | Reference-DOI: 10.1021/JM1005429

Molecule 1 - GLUTAMATE RECEPTOR 2
	Chains	:	A, B
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PET15B
	Expression System Strain	:	BL21(DE3)
	Expression System Taxid	:	469008
	Fragment	:	LIGAND BINDING DOMAIN, RESIDUES 412-427 AND 653-796
	Organism Common	:	HUMAN
	Organism Scientific	:	HOMO SAPIENS
	Organism Taxid	:	9606
	Other Details	:	THIS IS AN S1-S2 FUSION IN WHICH GLY 118 AND THR 119 REPLACE A MEMBRANE SPANNING REGION.
	Synonym	:	GLUR-B, GLUR-K2, GLUTAMATE RECEPTOR IONOTROPIC AMPA 2, GLUA2, AMPA-SELECTIVE GLUTAMATE RECEPTOR 2

		1	2
Asymmetric/Biological Unit	:	A	B

Summary Information (see also Sequences/Alignments below)

Asymmetric/Biological Unit (3, 8)

No.	Name	Count	Type	Full Name
1	7T9	1	Ligand/Ion	N-[(2S)-5-(6-FLUORO-3-PYRIDINYL)-2,3-DIHYDRO-1H-INDEN-2-YL]-2-PROPANESULFONAMIDE
2	GLU	2	Mod. Amino Acid	GLUTAMIC ACID
3	SO4	5	Ligand/Ion	SULFATE ION

Asymmetric Unit (8, 8)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	TYR A:61 , PRO A:89 , LEU A:90 , THR A:91 , ARG A:96 , GLY A:141 , SER A:142 , THR A:143 , GLU A:193 , TYR A:220 , HOH A:2148 , HOH A:2205 , HOH A:2283	BINDING SITE FOR RESIDUE GLU A 301
2	AC2	SOFTWARE	SER A:140 , LYS A:144 , ARG A:148 , HOH A:2150 , HOH A:2284 , HOH A:2285 , HOH A:2286	BINDING SITE FOR RESIDUE SO4 A1264
3	AC3	SOFTWARE	ARG A:148 , TRP A:159 , ARG A:163	BINDING SITE FOR RESIDUE SO4 A1265
4	AC4	SOFTWARE	TYR B:61 , PRO B:89 , LEU B:90 , THR B:91 , ARG B:96 , GLY B:141 , SER B:142 , THR B:143 , GLU B:193 , TYR B:220 , HOH B:2138 , HOH B:2185 , HOH B:2245	BINDING SITE FOR RESIDUE GLU B 301
5	AC5	SOFTWARE	ASP B:139 , SER B:140 , LYS B:144 , ARG B:148 , HOH B:2081 , HOH B:2246 , HOH B:2247 , HOH B:2248	BINDING SITE FOR RESIDUE SO4 B1263
6	AC6	SOFTWARE	LYS A:183 , ARG B:31 , HOH B:2040 , HOH B:2249 , HOH B:2250	BINDING SITE FOR RESIDUE SO4 B1264
7	AC7	SOFTWARE	ARG B:148 , TRP B:159 , ARG B:163 , HOH B:2251	BINDING SITE FOR RESIDUE SO4 B1265
8	AC8	SOFTWARE	LYS A:104 , PRO A:105 , MET A:107 , SER A:108 , SER A:217 , LYS A:218 , GLY A:219 , SER A:242 , HOH A:2234 , HOH A:2257 , LYS B:104 , PRO B:105 , MET B:107 , SER B:108 , SER B:217 , LYS B:218 , GLY B:219 , SER B:242 , HOH B:3000 , HOH B:3001 , HOH B:3002 , HOH B:3003 , HOH B:3004 , HOH B:3005 , HOH B:3006 , HOH B:3007	BINDING SITE FOR RESIDUE 7T9 B1266

Asymmetric/Biological Unit

No.	Residues
1	A:206	-	A:261
2	B:206	-	B:261

Asymmetric/Biological Unit

No.	Residues
1	Ser A:14	-	Pro A:15
2	Glu A:166	-	Pro A:167
3	Lys A:204	-	Pro A:205
4	Ser B:14	-	Pro B:15
5	Glu B:166	-	Pro B:167
6	Lys B:204	-	Pro B:205

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

(no "PROSITE Motif" information available for 2XHD)

(no "Exon" information available for 2XHD)

Asymmetric/Biological 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
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Chain A from PDB  Type:PROTEIN  Length:262
 aligned with GRIA2_HUMAN | P42262 from UniProtKB/Swiss-Prot  Length:883

    Alignment length:391
                                   422       432       442       452       462       472       482       492       502       512       522       532       542       552       562       572       582       592       602       612       622       632       642       652       662       672       682       692       702       712       722       732       742       752       762       772       782       792       802 
          GRIA2_HUMAN   413 NKTVVVTTILESPYVMMKKNHEMLEGNERYEGYCVDLAAEIAKHCGFKYKLTIVGDGKYGARDADTKIWNGMVGELVYGKADIAIAPLTITLVREEVIDFSKPFMSLGISIMIKKPQKSKPGVFSFLDPLAYEIWMCIVFAYIGVSVVLFLVSRFSPYEWHTEEFEDGRETQSSESTNEFGIFNSLWFSLGAFMQQGCDISPRSLSGRIVGGVWWFFTLIIISSYTANLAAFLTVERMVSPIESAEDLSKQTEIAYGTLDSGSTKEFFRRSKIAVFDKMWTYMRSAEPSVFVRTTAEGVARVRKSKGKYAYLLESTMNEYIEQRKPCDTMKVGGNLDSKGYGIATPKGSSLRNAVNLAVLKLNEQGLLDKLKNKWWYDKGECGSGGGDSKE 803
               SCOP domains d2xhda_ A: automated matches                                                                                                                                                                                                                                                                                                                                                                            SCOP domains
               CATH domains -2xhdA01 A:4-109,A:219-258 Periplasmic binding protein-like II                                             ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------2xhdA01 A:4-109,A:219-258               ------------ CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...eeeee.......ee.......hhhh.eehhhhhhhhhhhhhhh..eeeee................hhhhhhhhh....ee......hhhhhh.eee....eee.eeeeee..---------------------------------------------------------------------------------------------------------------------------....hhhhhhh....eee....hhhhhhhhhh.hhhhhhhhhhhhhh.......hhhhhhhhhhhh...eeeeeehhhhhhhhh.....eeee......eee..eee....hhhhhhhhhhhhhhhhhhhhhhhhhh........------. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 2xhd A   3 NKTVVVTTILESPYVMMKKNHEMLEGNERYEGYCVDLAAEIAKHCGFKYKLTIVGDGKYGARDADTKIWNGMVGELVYGKADIAIAPLTITLVREEVIDFSKPFMSLGISIMIKKG---------------------------------------------------------------------------------------------------------------------------TPIESAEDLSKQTEIAYGTLDSGSTKEFFRRSKIAVFDKMWTYMRSAEPSVFVRTTAEGVARVRKSKGKYAYLLESTMNEYIEQRKPCDTMKVGGNLDSKGYGIATPKGSSLRTPVNLAVLKLSEQGVLDKLKNKWWYDKGECGA------E 301
                                    12        22        32        42        52        62        72        82        92       102       112     |   -         -         -         -         -         -         -         -         -         -         -         -       119       129       139       149       159       169       179       189       199       209       219       229       239       249       259   |     -|
                                                                                                                                             118                                                                                                                         119                                                                                                                                             263    301

Chain B from PDB  Type:PROTEIN  Length:257
 aligned with GRIA2_HUMAN | P42262 from UniProtKB/Swiss-Prot  Length:883

    Alignment length:390
                                   423       433       443       453       463       473       483       493       503       513       523       533       543       553       563       573       583       593       603       613       623       633       643       653       663       673       683       693       703       713       723       733       743       753       763       773       783       793       803
          GRIA2_HUMAN   414 KTVVVTTILESPYVMMKKNHEMLEGNERYEGYCVDLAAEIAKHCGFKYKLTIVGDGKYGARDADTKIWNGMVGELVYGKADIAIAPLTITLVREEVIDFSKPFMSLGISIMIKKPQKSKPGVFSFLDPLAYEIWMCIVFAYIGVSVVLFLVSRFSPYEWHTEEFEDGRETQSSESTNEFGIFNSLWFSLGAFMQQGCDISPRSLSGRIVGGVWWFFTLIIISSYTANLAAFLTVERMVSPIESAEDLSKQTEIAYGTLDSGSTKEFFRRSKIAVFDKMWTYMRSAEPSVFVRTTAEGVARVRKSKGKYAYLLESTMNEYIEQRKPCDTMKVGGNLDSKGYGIATPKGSSLRNAVNLAVLKLNEQGLLDKLKNKWWYDKGECGSGGGDSKE 803
               SCOP domains d2xhdb_ B: automated matches                                                                                                                                                                                                                                                                                                                                                                           SCOP domains
               CATH domains 2xhdB01 B:4-109,B:219-262 Periplasmic binding protein-like II                                             ---------                                                                                                                           ----------------------------------------------------------------------------------------------------2xhdB01 B:4-109,B:219-262                          - CATH domains
           Pfam domains (1) -----------Lig_chan-Glu_bd-2xhdB03 B:15-80                                   --------------------------------------                                                                                                                           -Lig_chan-2xhdB01 B:120-262                                                                                                                            - Pfam domains (1)
           Pfam domains (2) -----------Lig_chan-Glu_bd-2xhdB04 B:15-80                                   --------------------------------------                                                                                                                           -Lig_chan-2xhdB02 B:120-262                                                                                                                            - Pfam domains (2)
         Sec.struct. author ..eeeee.......ee..hhhhhhhhh.eehhhhhhhhhhhhhhh..eeeee................hhhhhhhhh....ee......hhhhhh.eee....eee.eeeeee..---------------------------------------------------------------------------------------------------------------------------....hhhhhhh....eee....hhhhhhhhhh.hhhhhhhhhhhhhh.......hhhhhhhhhhhh...eeeeeehhhhhhhhh.....eeee......eee..eee....hhhhhhhhhhhhhhhhhhhhhhhhhhh.---..-------. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Transcript
                 2xhd B   4 KTVVVTTILESPYVMMKKNHEMLEGNERYEGYCVDLAAEIAKHCGFKYKLTIVGDGKYGARDADTKIWNGMVGELVYGKADIAIAPLTITLVREEVIDFSKPFMSLGISIMIKKG---------------------------------------------------------------------------------------------------------------------------TPIESAEDLSKQTEIAYGTLDSGSTKEFFRRSKIAVFDKMWTYMRSAEPSVFVRTTAEGVARVRKSKGKYAYLLESTMNEYIEQRKPCDTMKVGGNLDSKGYGIATPKGSSLRTPVNLAVLKLSEQGVLDKLKNKWWYD---CG-------E 301
                                    13        23        33        43        53        63        73        83        93       103       113    |    -         -         -         -         -         -         -         -         -         -         -         -       120       130       140       150       160       170       180       190       200       210       220       230       240       250      |  -||     301
                                                                                                                                            118                                                                                                                         119                                                                                                                                       257 261|     301
                                                                                                                                                                                                                                                                                                                                                                                                                       262

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/Biological Unit

Classes(

)

Folds(

)

Superfamilies( (-)

)

Families(

)

Protein Domains( (-)

)

Organisms( (-)

)

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

Fold: Periplasmic binding protein-like II (813)

Superfamily: Periplasmic binding protein-like II (813)

Family: Phosphate binding protein-like (463)

Protein domain: automated matches (76)

Human (Homo sapiens) [TaxId: 9606] (2)

1a	d2xhda_	A:
1b	d2xhdb_	B:

Asymmetric/Biological Unit

Classes(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

)

Organisms( (-)

)

Class: Alpha Beta (26913)

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

Topology: D-Maltodextrin-Binding Protein; domain 2 (600)

Homologous Superfamily: Periplasmic binding protein-like II (486)

Human (Homo sapiens) (55)

1a	2xhdB01	B:4-109,B:219-262
1b	2xhdA01	A:4-109,A:219-258

Asymmetric/Biological Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: Ion_channel (150)

Family: Lig_chan (109)

Homo sapiens (Human) (6)

1a	Lig_chan-2xhdB01	B:120-262
1b	Lig_chan-2xhdB02	B:120-262

Clan: PBP (391)

Family: Lig_chan-Glu_bd (91)

Homo sapiens (Human) (5)

2a	Lig_chan-Glu_bd-2xhdB03	B:15-80
2b	Lig_chan-Glu_bd-2xhdB04	B:15-80

Asymmetric/Biological Unit(hide GO term definitions)

Chain A,B (GRIA2_HUMAN | P42262)

molecular function
	GO:0004971	AMPA glutamate receptor activity	An ionotropic glutamate receptor activity that exhibits fast gating by glutamate and acts by opening a cation channel permeable to sodium, potassium, and, in the absence of a GluR2 subunit, calcium.
	GO:0005231	excitatory extracellular ligand-gated ion channel activity	Enables the transmembrane transfer of an ion by a channel that opens when a specific extracellular ligand has been bound by the channel complex or one of its constituent parts, where channel opening contributes to an increase in membrane potential.
	GO:0005234	extracellular-glutamate-gated ion channel activity	Enables the transmembrane transfer of an ion by a channel that opens when extracellular glutamate has been bound by the channel complex or one of its constituent parts.
	GO:0005216	ion channel activity	Enables the facilitated diffusion of an ion (by an energy-independent process) by passage through a transmembrane aqueous pore or channel without evidence for a carrier-mediated mechanism. May be either selective (it enables passage of a specific ion only) or non-selective (it enables passage of two or more ions of same charge but different size).
	GO:0004970	ionotropic glutamate receptor activity	Catalysis of the transmembrane transfer of an ion by a channel that opens when glutamate has been bound by the channel complex or one of its constituent parts.
	GO:0005515	protein binding	Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
	GO:0004872	receptor activity	Combining with an extracellular or intracellular messenger to initiate a change in cell activity.
biological process
	GO:0007268	chemical synaptic transmission	The vesicular release of classical neurotransmitter molecules from a presynapse, across a chemical synapse, the subsequent activation of neurotransmitter receptors at the postsynapse of a target cell (neuron, muscle, or secretory cell) and the effects of this activation on the postsynaptic membrane potential and ionic composition of the postsynaptic cytosol. This process encompasses both spontaneous and evoked release of neurotransmitter and all parts of synaptic vesicle exocytosis. Evoked transmission starts with the arrival of an action potential at the presynapse.
	GO:0034220	ion transmembrane transport	A process in which an ion is transported from one side of a membrane to the other by means of some agent such as a transporter or pore.
	GO:0006811	ion transport	The directed movement of charged atoms or small charged molecules into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
	GO:0035235	ionotropic glutamate receptor signaling pathway	A series of molecular signals initiated by glutamate binding to a glutamate receptor on the surface of the target cell, followed by the movement of ions through a channel in the receptor complex. Ends with regulation of a downstream cellular process, e.g. transcription.
	GO:0007165	signal transduction	The cellular process in which a signal is conveyed to trigger a change in the activity or state of a cell. Signal transduction begins with reception of a signal (e.g. a ligand binding to a receptor or receptor activation by a stimulus such as light), or for signal transduction in the absence of ligand, signal-withdrawal or the activity of a constitutively active receptor. Signal transduction ends with regulation of a downstream cellular process, e.g. regulation of transcription or regulation of a metabolic process. Signal transduction covers signaling from receptors located on the surface of the cell and signaling via molecules located within the cell. For signaling between cells, signal transduction is restricted to events at and within the receiving cell.
	GO:0006810	transport	The directed movement of substances (such as macromolecules, small molecules, ions) or cellular components (such as complexes and organelles) into, out of or within a cell, or between cells, or within a multicellular organism by means of some agent such as a transporter, pore or motor protein.
cellular component
	GO:0032281	AMPA glutamate receptor complex	An assembly of four or five subunits which form a structure with an extracellular N-terminus and a large loop that together form the ligand binding domain. The C-terminus is intracellular. The ionotropic glutamate receptor complex itself acts as a ligand gated ion channel; on binding glutamate, charged ions pass through a channel in the center of the receptor complex. The AMPA receptors mediate fast synaptic transmission in the CNS and are composed of subunits GluR1-4, products from separate genes. These subunits have an extracellular N-terminus and an intracellular C-terminus.
	GO:0030054	cell junction	A cellular component that forms a specialized region of connection between two or more cells or between a cell and the extracellular matrix. At a cell junction, anchoring proteins extend through the plasma membrane to link cytoskeletal proteins in one cell to cytoskeletal proteins in neighboring cells or to proteins in the extracellular matrix.
	GO:0030666	endocytic vesicle membrane	The lipid bilayer surrounding an endocytic vesicle.
	GO:0005783	endoplasmic reticulum	The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached).
	GO:0005789	endoplasmic reticulum membrane	The lipid bilayer surrounding the endoplasmic reticulum.
	GO:0016021	integral component of membrane	The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
	GO:0005887	integral component of plasma membrane	The component of the plasma membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0005886	plasma membrane	The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
	GO:0045211	postsynaptic membrane	A specialized area of membrane facing the presynaptic membrane on the tip of the nerve ending and separated from it by a minute cleft (the synaptic cleft). Neurotransmitters cross the synaptic cleft and transmit the signal to the postsynaptic membrane.
	GO:0045202	synapse	The junction between a nerve fiber of one neuron and another neuron, muscle fiber or glial cell. As the nerve fiber approaches the synapse it enlarges into a specialized structure, the presynaptic nerve ending, which contains mitochondria and synaptic vesicles. At the tip of the nerve ending is the presynaptic membrane; facing it, and separated from it by a minute cleft (the synaptic cleft) is a specialized area of membrane on the receiving cell, known as the postsynaptic membrane. In response to the arrival of nerve impulses, the presynaptic nerve ending secretes molecules of neurotransmitters into the synaptic cleft. These diffuse across the cleft and transmit the signal to the postsynaptic membrane.

Asymmetric/Biological Unit
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	Cis Peptide Bonds
		Glu A:166 - Pro A:167	[ RasMol ]
		Glu B:166 - Pro B:167	[ RasMol ]
		Lys A:204 - Pro A:205	[ RasMol ]
		Lys B:204 - Pro B:205	[ RasMol ]
		Ser A:14 - Pro A:15	[ RasMol ]
		Ser B:14 - Pro B:15	[ RasMol ]

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	2xhd
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	GRIA2_HUMAN \| P42262
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UniProtKB/Swiss-Prot
	GRIA2_HUMAN \| P42262	:	2wjw 2wjx 3r7x 3rn8 3rnn 3ua8 5h8s

2wjw	CRYSTAL STRUCTURE OF THE HUMAN IONOTROPIC GLUTAMATE RECEPTOR GLUR2 ATD REGION AT 1.8 A RESOLUTION
2wjx	CRYSTAL STRUCTURE OF THE HUMAN IONOTROPIC GLUTAMATE RECEPTOR GLUR2 ATD REGION AT 4.1 A RESOLUTION

Description

Compounds

Structural Features

Chains, Units

Ligands, Modified Residues, Ions (3, 8)

Sites (8, 8)

SS Bonds (2, 2)

Cis Peptide Bonds (6, 6)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (0, 0)

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SCOP Domains (1, 2)

CATH Domains (1, 2)

Pfam Domains (2, 4)

Gene Ontology (24, 24)

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