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Asym./Biol. Unit (Jmol Viewer)

Asym./Biol. Unit - sites (Jmol Viewer)

Title :   LIGANDED X-RAY CRYSTAL STRUCTURE OF CYCLIN DEPENDENT KINASE 6 (CDK6)

Authors :   Y. S. Cho, H. Angove, C. Brain, C. H. T. Chen, R. Cheng, R. Chopra, K. Chung M. Congreve, C. Dagostin, D. Davis, R. Feltell, J. Giraldes, S. Hiscoc S. Kovats, B. Lagu, K. Lewry, A. Loo, Y. Lu, M. Luzzio, W. Maniara, R. Mcm P. Mortenson, R. Benning, M. Oreilly, D. Rees, J. Shen, T. Smith, Y. Wan G. Williams, A. Woolford, W. Wrona, M. Xu, F. Yang, S. Howard

Date :   15 May 12 (Deposition) - 06 Feb 13 (Release) - 18 Jun 14 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   2.31

Chains :   Asym./Biol. Unit : A

Keywords :   Transferase (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   Y. S. Cho, H. Angove, C. Brain, C. H. T. Chen, R. Cheng, R. Chopra, K. Chung, M. Congreve, C. Dagostin, D. Davis, R. Feltell, J. Giraldes, S. Hiscock, S. Kim, S. Kovats, B. Lagu, K. Lewry, A. Loo, Y. Lu, M. Luzzio W. Maniara, R. Mcmenamin, P. Mortenson, R. Benning, M. Oreilly, D. Rees, J. Shen, T. Smith, Y. Wang, G. Williams, A. Woolford, W. Wrona, M. Xu, F. Yang, S. Howard
Fragment-Based Discovery Of 7-Azabenzimidazoles As Potent, Highly Selective And Orally Active Cdk4/6 Inhibitors
Acs Med. Chem. Lett. V. 3 445 2012
PubMed-ID: 24900493 | Reference-DOI: 10.1021/ML200241A

Molecule 1 - CYCLIN-DEPENDENT KINASE 6
	Chains	:	A
	EC Number	:	2.7.11.22
	Engineered	:	YES
	Expression System	:	SPODOPTERA FRUGIPERDA
	Expression System Common	:	FALL ARMYWORM
	Expression System Taxid	:	7108
	Fragment	:	KINASE DOMAIN, RESIDUES 1-301
	Organism Common	:	HUMAN
	Organism Scientific	:	HOMO SAPIENS
	Organism Taxid	:	9606
	Synonym	:	CELL DIVISION PROTEIN KINASE 6, SERINE/THREONINE-PROTEIN KINASE PLSTIRE

		1
Asymmetric/Biological Unit	:	A

Summary Information (see also Sequences/Alignments below)

Asymmetric/Biological Unit (1, 1)

No.	Name	Count	Type	Full Name
1	4AU	1	Ligand/Ion	1H-BENZIMIDAZOL-2-YL(1H-PYRROL-2-YL)METHANONE

Asymmetric Unit (1, 1)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	ILE A:19 , ALA A:41 , GLU A:99 , HIS A:100 , VAL A:101 , ASP A:102 , ASP A:104 , LEU A:152 , ALA A:162	BINDING SITE FOR RESIDUE 4AU A1302

(no "SS Bond" information available for 4AUA)

Asymmetric/Biological Unit

No.	Residues
1	Ile A:19	-	Gly A:20
2	Gly A:22	-	Ala A:23
3	Glu A:114	-	Pro A:115

Asymmetric/Biological Unit (3, 3)

								dbSNP	PDB
No.	Source	Variant ID	Variant			UniProt ID	Status	ID	Chain	Variant
1	UniProt	VAR_041978	D	110	N	CDK6_HUMAN	Polymorphism	35654944	A	D	110	N
2	UniProt	VAR_072638	A	197	T	CDK6_HUMAN	Disease (MCPH12)	606231255	A	A	197	T
3	UniProt	VAR_041979	P	199	L	CDK6_HUMAN	Unclassified	---	A	P	199	L

SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

Asymmetric/Biological Unit (2, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	PROTEIN_KINASE_ATP	PS00107	Protein kinases ATP-binding region signature.	CDK6_HUMAN	19-43	1	A:19-43
2	PROTEIN_KINASE_ST	PS00108	Serine/Threonine protein kinases active-site signature.	CDK6_HUMAN	141-153	1	A:141-153

Asymmetric/Biological Unit (7, 7)

	ENSEMBL					UniProtKB			PDB
No.	Transcript ID	Exon	Exon ID	Genome Location	Length	ID	Location	Length	Count	Location	Length
1.3	ENST00000265734	3	ENSE00001337042	chr7:92463231-92463187	45	CDK6_HUMAN	-	0	0	-	-
1.4b	ENST00000265734	4b	ENSE00001132651	chr7:92463004-92462405	600	CDK6_HUMAN	1-78	78	1	A:11-78 (gaps)	68
1.5	ENST00000265734	5	ENSE00000877375	chr7:92404145-92404010	136	CDK6_HUMAN	78-123	46	1	A:78-123 (gaps)	46
1.6a	ENST00000265734	6a	ENSE00000877376	chr7:92355107-92354940	168	CDK6_HUMAN	124-179	56	1	A:124-167	44
1.7a	ENST00000265734	7a	ENSE00001764561	chr7:92300849-92300740	110	CDK6_HUMAN	180-216	37	1	A:182-216	35
1.8	ENST00000265734	8	ENSE00000705202	chr7:92252400-92252350	51	CDK6_HUMAN	216-233	18	1	A:216-233	18
1.9b	ENST00000265734	9b	ENSE00000705199	chr7:92247521-92247386	136	CDK6_HUMAN	233-278	46	1	A:233-278	46
1.10c	ENST00000265734	10c	ENSE00001132644	chr7:92244600-92234235	10366	CDK6_HUMAN	279-326	48	1	A:279-301	23

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
	(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:256
 aligned with CDK6_HUMAN | Q00534 from UniProtKB/Swiss-Prot  Length:326

    Alignment length:291
                                    20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300 
           CDK6_HUMAN    11 QQYECVAEIGEGAYGKVFKARDLKNGGRFVALKRVRVQTGEEGMPLSTIREVAVLRHLETFEHPNVVRLFDVCTVSRTDRETKLTLVFEHVDQDLTTYLDKVPEPGVPTETIKDMMFQLLRGLDFLHSHRVVHRDLKPQNILVTSSGQIKLADFGLARIYSFQMALTSVVVTLWYRAPEVLLQSSYATPVDLWSVGCIFAEMFRRKPLFRGSSDVDQLGKILDVIGLPGEEDWPRDVALPRQAFHSKSAQPIEKFVTDIDELGKDLLLKCLTFNPAKRISAYSALSHPYFQ 301
               SCOP domains d4auaa_ A: Cy clin-dependent PK, C            DK6                                                                                                                                                                                                                                                   SCOP domains
               CATH domains --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ..eeeeeeeee..-.eeeeeee.....eeeeee.------------hhhhhhhhhhhhhh........eeeee.--------..eeeee...eehhhhhhhh.....hhhhhhhhhhhhhhhhhhhhhh.......hhh.eee.....eee......--------------.....hhhhhh.....hhhhhhhhhhhhhhhhhh.......hhhhhhhhhhhhhh..hhhhh......hhhhh......hhhhh....hhhhhhhhhhhh........hhhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) ---------------------------------------------------------------------------------------------------N--------------------------------------------------------------------------------------T-L------------------------------------------------------------------------------------------------------ SAPs(SNPs)
                    PROSITE --------PROTEIN_KINASE_ATP       -------------------------------------------------------------------------------------------------PROTEIN_KINAS---------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
           Transcript 1 (1) Exon 1.4b  PDB: A:11-78 (gaps) UniProt: 1-78 [INCOMPLETE]           ---------------------------------------------Exon 1.6a  PDB: A:124-167 UniProt: 124-179 [INCOMPLETE] Exon 1.7a  PDB: A:182-216            ----------------Exon 1.9b  PDB: A:233-278 UniProt: 233-278    Exon 1.10c [INCOMPLETE] Transcript 1 (1)
           Transcript 1 (2) -------------------------------------------------------------------Exon 1.5  PDB: A:78-123 (gaps) UniProt: 78-123--------------------------------------------------------------------------------------------Exon 1.8          -------------------------------------------------------------------- Transcript 1 (2)
                 4aua A  11 QQYECVAEIGEGA-GKVFKARDLKNGGRFVALKR------------STIREVAVLRHLETFEHPNVVRLFDVCT--------KLTLVFEHVDQDLTTYLDKVPEPGVPTETIKDMMFQLLRGLDFLHSHRVVHRDLKPQNILVTSSGQIKLADFGLA--------------TLWYRAPEVLLQSSYATPVDLWSVGCIFAEMFRRKPLFRGSSDVDQLGKILDVIGLPGEEDWPRDVALPRQAFHSKSAQPIEKFVTDIDELGKDLLLKCLTFNPAKRISAYSALSHPYFQ 301
                                    20  | |   30        40   |     -      | 60        70        80   |     -  |    100       110       120       130       140       150       160      |  -         - |     190       200       210       220       230       240       250       260       270       280       290       300 
                                       23 |                 44           57                         84       93                                                                       167            182                                                                                                                       
                                         25

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(

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Folds(

)

Superfamilies( (-)

)

Families(

)

Protein Domains( (-)

)

Organisms( (-)

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Class: Alpha and beta proteins (a+b) (23004)

Fold: Protein kinase-like (PK-like) (2589)

Superfamily: Protein kinase-like (PK-like) (2589)

Family: Protein kinases, catalytic subunit (1977)

Protein domain: Cyclin-dependent PK, CDK6 (11)

Human (Homo sapiens) [TaxId: 9606] (11)

d4auaa_

(no "CATH Domain" information available for 4AUA)

(no "Pfam Domain" information available for 4AUA)

Asymmetric/Biological Unit(hide GO term definitions)

Chain A (CDK6_HUMAN | Q00534)

molecular function
	GO:0005524	ATP binding	Interacting selectively and non-covalently with ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
	GO:0030332	cyclin binding	Interacting selectively and non-covalently with cyclins, proteins whose levels in a cell varies markedly during the cell cycle, rising steadily until mitosis, then falling abruptly to zero. As cyclins reach a threshold level, they are thought to drive cells into G2 phase and thus to mitosis.
	GO:0004693	cyclin-dependent protein serine/threonine kinase activity	Catalysis of the reactions: ATP + protein serine = ADP + protein serine phosphate, and ATP + protein threonine = ADP + protein threonine phosphate. This reaction requires the binding of a regulatory cyclin subunit and full activity requires stimulatory phosphorylation by a CDK-activating kinase (CAK).
	GO:0016301	kinase activity	Catalysis of the transfer of a phosphate group, usually from ATP, to a substrate molecule.
	GO:0000166	nucleotide binding	Interacting selectively and non-covalently with a nucleotide, any compound consisting of a nucleoside that is esterified with (ortho)phosphate or an oligophosphate at any hydroxyl group on the ribose or deoxyribose.
	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:0004672	protein kinase activity	Catalysis of the phosphorylation of an amino acid residue in a protein, usually according to the reaction: a protein + ATP = a phosphoprotein + ADP.
	GO:0004674	protein serine/threonine kinase activity	Catalysis of the reactions: ATP + protein serine = ADP + protein serine phosphate, and ATP + protein threonine = ADP + protein threonine phosphate.
	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.
biological process
	GO:0000082	G1/S transition of mitotic cell cycle	The mitotic cell cycle transition by which a cell in G1 commits to S phase. The process begins with the build up of G1 cyclin-dependent kinase (G1 CDK), resulting in the activation of transcription of G1 cyclins. The process ends with the positive feedback of the G1 cyclins on the G1 CDK which commits the cell to S phase, in which DNA replication is initiated.
	GO:0007219	Notch signaling pathway	A series of molecular signals initiated by the binding of an extracellular ligand to the receptor Notch on the surface of a target cell, and ending with regulation of a downstream cellular process, e.g. transcription.
	GO:0033077	T cell differentiation in thymus	The process in which a precursor cell type acquires the specialized features of a T cell via a differentiation pathway dependent upon transit through the thymus.
	GO:0014002	astrocyte development	The process aimed at the progression of an astrocyte over time, from initial commitment of the cell to a specific fate, to the fully functional differentiated cell. An astrocyte is the most abundant type of glial cell. Astrocytes provide support for neurons and regulate the environment in which they function.
	GO:0007049	cell cycle	The progression of biochemical and morphological phases and events that occur in a cell during successive cell replication or nuclear replication events. Canonically, the cell cycle comprises the replication and segregation of genetic material followed by the division of the cell, but in endocycles or syncytial cells nuclear replication or nuclear division may not be followed by cell division.
	GO:0007050	cell cycle arrest	A regulatory process that halts progression through the cell cycle during one of the normal phases (G1, S, G2, M).
	GO:0043697	cell dedifferentiation	The process in which a specialized cell loses the structural or functional features that characterize it in the mature organism, or some other relatively stable phase of the organism's life history. Under certain conditions, these cells can revert back to the features of the stem cells that were their ancestors.
	GO:0030154	cell differentiation	The process in which relatively unspecialized cells, e.g. embryonic or regenerative cells, acquire specialized structural and/or functional features that characterize the cells, tissues, or organs of the mature organism or some other relatively stable phase of the organism's life history. Differentiation includes the processes involved in commitment of a cell to a specific fate and its subsequent development to the mature state.
	GO:0051301	cell division	The process resulting in division and partitioning of components of a cell to form more cells; may or may not be accompanied by the physical separation of a cell into distinct, individually membrane-bounded daughter cells.
	GO:0021542	dentate gyrus development	The process whose specific outcome is the progression of the dentate gyrus over time, from its formation to the mature structure. The dentate gyrus is one of two interlocking gyri of the hippocampus. It contains granule cells, which project to the pyramidal cells and interneurons of the CA3 region of the ammon gyrus.
	GO:0048699	generation of neurons	The process in which nerve cells are generated. This includes the production of neuroblasts and their differentiation into neurons.
	GO:0042063	gliogenesis	The process that results in the generation of glial cells. This includes the production of glial progenitors and their differentiation into mature glia.
	GO:0002244	hematopoietic progenitor cell differentiation	The process in which precursor cell type acquires the specialized features of a hematopoietic progenitor cell, a class of cell types including myeloid progenitor cells and lymphoid progenitor cells.
	GO:0060218	hematopoietic stem cell differentiation	The process in which a relatively unspecialized cell acquires specialized features of a hematopoietic stem cell. A stem cell is a cell that retains the ability to divide and proliferate throughout life to provide progenitor cells that can differentiate into specialized cells.
	GO:0030097	hemopoiesis	The process whose specific outcome is the progression of the myeloid and lymphoid derived organ/tissue systems of the blood and other parts of the body over time, from formation to the mature structure. The site of hemopoiesis is variable during development, but occurs primarily in bone marrow or kidney in many adult vertebrates.
	GO:0021670	lateral ventricle development	The process whose specific outcome is the progression of the lateral ventricles over time, from the formation to the mature structure. The two lateral ventricles are a cavity in each of the cerebral hemispheres derived from the cavity of the embryonic neural tube. They are separated from each other by the septum pellucidum, and each communicates with the third ventricle by the foramen of Monro, through which also the choroid plexuses of the lateral ventricles become continuous with that of the third ventricle.
	GO:0045786	negative regulation of cell cycle	Any process that stops, prevents or reduces the rate or extent of progression through the cell cycle.
	GO:0045596	negative regulation of cell differentiation	Any process that stops, prevents, or reduces the frequency, rate or extent of cell differentiation.
	GO:0008285	negative regulation of cell proliferation	Any process that stops, prevents or reduces the rate or extent of cell proliferation.
	GO:2000773	negative regulation of cellular senescence	Any process that stops, prevents or reduces the frequency, rate or extent of cellular senescence.
	GO:0050680	negative regulation of epithelial cell proliferation	Any process that stops, prevents or reduces the rate or extent of epithelial cell proliferation.
	GO:0045638	negative regulation of myeloid cell differentiation	Any process that stops, prevents, or reduces the frequency, rate or extent of myeloid cell differentiation.
	GO:0045668	negative regulation of osteoblast differentiation	Any process that stops, prevents, or reduces the frequency, rate or extent of osteoblast differentiation.
	GO:0016310	phosphorylation	The process of introducing a phosphate group into a molecule, usually with the formation of a phosphoric ester, a phosphoric anhydride or a phosphoric amide.
	GO:0001954	positive regulation of cell-matrix adhesion	Any process that activates or increases the rate or extent of cell adhesion to an extracellular matrix.
	GO:0048146	positive regulation of fibroblast proliferation	Any process that activates or increases the frequency, rate or extent of multiplication or reproduction of fibroblast cells.
	GO:0010628	positive regulation of gene expression	Any process that increases the frequency, rate or extent of gene expression. Gene expression is the process in which a gene's coding sequence is converted into a mature gene product or products (proteins or RNA). This includes the production of an RNA transcript as well as any processing to produce a mature RNA product or an mRNA or circRNA (for protein-coding genes) and the translation of that mRNA or circRNA into protein. Protein maturation is included when required to form an active form of a product from an inactive precursor form.
	GO:0006468	protein phosphorylation	The process of introducing a phosphate group on to a protein.
	GO:2000145	regulation of cell motility	Any process that modulates the frequency, rate or extent of cell motility.
	GO:0042127	regulation of cell proliferation	Any process that modulates the frequency, rate or extent of cell proliferation.
	GO:0045646	regulation of erythrocyte differentiation	Any process that modulates the frequency, rate or extent of erythrocyte differentiation.
	GO:0010468	regulation of gene expression	Any process that modulates the frequency, rate or extent of gene expression. Gene expression is the process in which a gene's coding sequence is converted into a mature gene product or products (proteins or RNA). This includes the production of an RNA transcript as well as any processing to produce a mature RNA product or an mRNA or circRNA (for protein-coding genes) and the translation of that mRNA or circRNA into protein. Protein maturation is included when required to form an active form of a product from an inactive precursor form.
	GO:0009615	response to virus	Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus from a virus.
	GO:0003323	type B pancreatic cell development	The process whose specific outcome is the progression of a type B pancreatic cell over time, from its formation to the mature structure. A type B pancreatic cell is a cell located towards center of the islets of Langerhans that secretes insulin.
cellular component
	GO:0042995	cell projection	A prolongation or process extending from a cell, e.g. a flagellum or axon.
	GO:0005813	centrosome	A structure comprised of a core structure (in most organisms, a pair of centrioles) and peripheral material from which a microtubule-based structure, such as a spindle apparatus, is organized. Centrosomes occur close to the nucleus during interphase in many eukaryotic cells, though in animal cells it changes continually during the cell-division cycle.
	GO:0000307	cyclin-dependent protein kinase holoenzyme complex	Cyclin-dependent protein kinases (CDKs) are enzyme complexes that contain a kinase catalytic subunit associated with a regulatory cyclin partner.
	GO:0005737	cytoplasm	All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
	GO:0005856	cytoskeleton	Any of the various filamentous elements that form the internal framework of cells, and typically remain after treatment of the cells with mild detergent to remove membrane constituents and soluble components of the cytoplasm. The term embraces intermediate filaments, microfilaments, microtubules, the microtrabecular lattice, and other structures characterized by a polymeric filamentous nature and long-range order within the cell. The various elements of the cytoskeleton not only serve in the maintenance of cellular shape but also have roles in other cellular functions, including cellular movement, cell division, endocytosis, and movement of organelles.
	GO:0005829	cytosol	The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
	GO:0005815	microtubule organizing center	An intracellular structure that can catalyze gamma-tubulin-dependent microtubule nucleation and that can anchor microtubules by interacting with their minus ends, plus ends or sides.
	GO:0005654	nucleoplasm	That part of the nuclear content other than the chromosomes or the nucleolus.
	GO:0005634	nucleus	A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
	GO:0001726	ruffle	Projection at the leading edge of a crawling cell; the protrusions are supported by a microfilament meshwork.

Asymmetric/Biological Unit
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	Cis Peptide Bonds
		Glu A:114 - Pro A:115	[ RasMol ]
		Gly A:22 - Ala A:23	[ RasMol ]
		Ile A:19 - Gly A:20	[ RasMol ]

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	2.7.11.22
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1bi7	MECHANISM OF G1 CYCLIN DEPENDENT KINASE INHIBITION FROM THE STRUCTURE OF THE CDK6-P16INK4A TUMOR SUPPRESSOR COMPLEX
1bi8	MECHANISM OF G1 CYCLIN DEPENDENT KINASE INHIBITION FROM THE STRUCTURES CDK6-P19INK4D INHIBITOR COMPLEX
1blx	P19INK4D/CDK6 COMPLEX
1g3n	STRUCTURE OF A P18(INK4C)-CDK6-K-CYCLIN TERNARY COMPLEX
1jow	CRYSTAL STRUCTURE OF A COMPLEX OF HUMAN CDK6 AND A VIRALCYCLIN
1xo2	CRYSTAL STRUCTURE OF A HUMAN CYCLIN-DEPENDENT KINASE 6COMPLEX WITH A FLAVONOL INHIBITOR, FISETIN
2euf	X-RAY STRUCTURE OF HUMAN CDK6-VCYCLIN IN COMPLEX WITH THEINHIBITOR PD0332991
2f2c	X-RAY STRUCTURE OF HUMAN CDK6-VCYCLINWITH THE INHIBITORAMINOPURVALANOL

Description

Compounds

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Ligands, Modified Residues, Ions (1, 1)

Sites (1, 1)

SS Bonds (0, 0)

Cis Peptide Bonds (3, 3)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (3, 3)

PROSITE Motifs (2, 2)

Exons (7, 7)

Sequences/Alignments

Classification and Annotation

SCOP Domains (1, 1)

CATH Domains (0, 0)

Pfam Domains (0, 0)

Gene Ontology (53, 53)

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