2R3M - JenaLib

Asym./Biol. Unit (Jmol Viewer)

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

Title :   CRYSTAL STRUCTURE OF CYCLIN-DEPENDENT KINASE 2 WITH INHIBITOR

Authors :   T. O. Fischmann, A. W. Hruza, V. M. Madison, J. S. Duca

Date :   29 Aug 07 (Deposition) - 22 Jan 08 (Release) - 24 Feb 09 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   1.70

Chains :   Asym./Biol. Unit : A

Keywords :   Serine/Threonine-Protein Kinase, Cell Cycle, Inhibition, Cyclin-Dependent Kinase, Cancer, Atp-Binding, Cell Division, Mitosis, Nucleotide-Binding, Phosphorylation, Polymorphism, Transferase (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   T. O. Fischmann, A. Hruza, J. S. Duca, L. Ramanathan, T. Mayhood, W. T. Windsor, H. V. Le, T. J. Guzi, M. P. Dwyer, K. Paruch, R. J. Doll, E. Lees, D. Parry, W. Seghezzi, V. Madison
Structure-Guided Discovery Of Cyclin-Dependent Kinase Inhibitors.
Biopolymers V. 89 372 2008
PubMed-ID: 17937404 | Reference-DOI: 10.1002/BIP.20868
(for further references see the PDB file header)

Molecule 1 - CELL DIVISION PROTEIN KINASE 2
	Chains	:	A
	EC Number	:	2.7.11.22
	Engineered	:	YES
	Expression System	:	UNIDENTIFIED BACULOVIRUS
	Expression System Strain	:	SF9
	Expression System Taxid	:	10469
	Gene	:	CDK2
	Organism Common	:	HUMAN
	Organism Scientific	:	HOMO SAPIENS
	Organism Taxid	:	9606
	Synonym	:	P33 PROTEIN KINASE

		1
Asymmetric/Biological Unit	:	A

Summary Information (see also Sequences/Alignments below)

Asymmetric/Biological Unit (3, 3)

No.	Name	Count	Type	Full Name
1	ACE	1	Mod. Amino Acid	ACETYL GROUP
2	CSD	1	Mod. Amino Acid	3-SULFINOALANINE
3	SCX	1	Ligand/Ion	N-((2-AMINOPYRIMIDIN-5-YL)METHYL)-5-(2,6-DIFLUOROPHENYL)-3-ETHYLPYRAZOLO[1,5-A]PYRIMIDIN-7-AMINE

Asymmetric Unit (1, 1)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	ILE A:10 , VAL A:18 , ALA A:31 , PHE A:80 , GLU A:81 , LEU A:83 , HIS A:84 , GLN A:85 , LYS A:89 , GLN A:131 , ASN A:132 , LEU A:134 , ALA A:144 , HOH A:1166 , HOH A:1184	BINDING SITE FOR RESIDUE SCX A 501

(no "SS Bond" information available for 2R3M)

Asymmetric/Biological Unit

No.	Residues
1	Pro A:253	-	Pro A:254

Asymmetric/Biological Unit (4, 4)

								dbSNP	PDB
No.	Source	Variant ID	Variant			UniProt ID	Status	ID	Chain	Variant
1	UniProt	VAR_016157	Y	15	S	CDK2_HUMAN	Polymorphism	3087335	A	Y	15	S
2	UniProt	VAR_053927	V	18	L	CDK2_HUMAN	Polymorphism	11554376	A	V	18	L
3	UniProt	VAR_041972	P	45	L	CDK2_HUMAN	Unclassified	---	A	P	45	L
4	UniProt	VAR_019988	T	290	S	CDK2_HUMAN	Polymorphism	2069413	A	T	290	S

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.	CDK2_HUMAN	10-33	1	A:10-33
2	PROTEIN_KINASE_ST	PS00108	Serine/Threonine protein kinases active-site signature.	CDK2_HUMAN	123-135	1	A:123-135

Asymmetric/Biological Unit (7, 7)

	ENSEMBL					UniProtKB			PDB
No.	Transcript ID	Exon	Exon ID	Genome Location	Length	ID	Location	Length	Count	Location	Length
1.1	ENST00000266970	1	ENSE00001301614	chr12:56360556-56360908	353	CDK2_HUMAN	1-39	39	1	A:1-36	36
1.2	ENST00000266970	2	ENSE00000838625	chr12:56361641-56361718	78	CDK2_HUMAN	39-65	27	1	A:44-65	22
1.3	ENST00000266970	3	ENSE00000838626	chr12:56361833-56361953	121	CDK2_HUMAN	65-105	41	1	A:65-105	41
1.4	ENST00000266970	4	ENSE00000838629	chr12:56362562-56362732	171	CDK2_HUMAN	106-162	57	1	A:106-162 (gaps)	57
1.5	ENST00000266970	5	ENSE00001704611	chr12:56363259-56363360	102	CDK2_HUMAN	163-196	34	1	A:163-196	34
1.6	ENST00000266970	6	ENSE00000938649	chr12:56364828-56365031	204	CDK2_HUMAN	197-264	68	1	A:197-264	68
1.7	ENST00000266970	7	ENSE00001215687	chr12:56365305-56366565	1261	CDK2_HUMAN	265-298	34	1	A:265-298	34

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:283
 aligned with CDK2_HUMAN | P24941 from UniProtKB/Swiss-Prot  Length:298

    Alignment length:299
                             1                                                                                                                                                                                                                                                                                                         
                             |       9        19        29        39        49        59        69        79        89        99       109       119       129       139       149       159       169       179       189       199       209       219       229       239       249       259       269       279       289         
           CDK2_HUMAN     - -MENFQKVEKIGEGTYGVVYKARNKLTGEVVALKKIRLDTETEGVPSTAIREISLLKELNHPNIVKLLDVIHTENKLYLVFEFLHQDLKKFMDASALTGIPLPLIKSYLFQLLQGLAFCHSHRVLHRDLKPQNLLINTEGAIKLADFGLARAFGVPVRTYTHEVVTLWYRAPEILLGCKYYSTAVDIWSLGCIFAEMVTRRALFPGDSEIDQLFRIFRTLGTPDEVVWPGVTSMPDYKPSFPKWARQDFSKVVPPLDEDGRSLLSQMLHYDPNKRISAKAALAHPFFQDVTKPVPHLRL 298
               SCOP domains d2r3ma_ A: Cyclin-dependent PK, CDK2                                                                                                                                                                                                                                                                        SCOP domains
               CATH domains -2r3mA01 A:1-84 Phosphorylase Kinase;        domain 1                                2r3mA02 A:85-296 Transferase(Phosphotransferase) domain 1                                                                                                                                                           -- CATH domains
               Pfam domains ----Pkinase-2r3mA01 A:4-286                                                                                                                                                                                                                                                                    ------------ Pfam domains
         Sec.struct. author ....eeeeeeeee....eeeeeee.....eeeeeee.-------.hhhhhhhhhhhh.........eeeeeee..eeeeeee...eehhhhhhhh.....hhhhhhhhhhhhhhhhhhhhhh.......hhh.eee.....eee........---------.........hhhhhh......hhhhhhhhhhhhhhhhhh.......hhhhhhhhhhhhhh........hhhhh.............hhhhhh...hhhhhhhhhhhh........hhhhhhhhhhhh........... Sec.struct. author
                 SAPs(SNPs) ---------------S--L--------------------------L----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------S-------- SAPs(SNPs)
                    PROSITE ----------PROTEIN_KINASE_ATP      -----------------------------------------------------------------------------------------PROTEIN_KINAS------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
           Transcript 1 (1) -Exon 1.1  PDB: A:1-36 UniProt: 1-39    -------------------------Exon 1.3  PDB: A:65-105 UniProt: 65-105  Exon 1.4  PDB: A:106-162 (gaps) UniProt: 106-162         Exon 1.5  PDB: A:163-196          Exon 1.6  PDB: A:197-264 UniProt: 197-264                           Exon 1.7  PDB: A:265-298           Transcript 1 (1)
           Transcript 1 (2) ---------------------------------------Exon 1.2  PDB: A:44-65     ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript 1 (2)
                 2r3m A   0 xMENFQKVEKIGEGTYGVVYKARNKLTGEVVALKKIR-------VPSTAIREISLLKELNHPNIVKLLDVIHTENKLYLVFEFLHQDLKKFMDASALTGIPLPLIKSYLFQLLQGLAFCHSHRVLHRDLKPQNLLINTEGAIKLADFGLARA---------HEVVTLWYRAPEILLGcKYYSTAVDIWSLGCIFAEMVTRRALFPGDSEIDQLFRIFRTLGTPDEVVWPGVTSMPDYKPSFPKWARQDFSKVVPPLDEDGRSLLSQMLHYDPNKRISAKAALAHPFFQDVTKPVPHLRL 298
                            |        9        19        29      |  -    |   49        59        69        79        89        99       109       119       129       139       149 |       - |     169       179       189       199       209       219       229       239       249       259       269       279       289         
                            |                                  36      44                                                                                                        151       161             177-CSD                                                                                                                     
                            0-ACE

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(

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Superfamilies( (-)

)

Families(

)

Protein Domains( (-)

)

Organisms( (-)

)

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, CDK2 (340)

Human (Homo sapiens) [TaxId: 9606] (336)

d2r3ma_

Asymmetric/Biological Unit

Classes(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

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Organisms( (-)

)

Class: Alpha Beta (26913)

Architecture: 2-Layer Sandwich (8480)

Topology: Phosphorylase Kinase; domain 1 (1392)

Homologous Superfamily: Phosphorylase Kinase; domain 1 (1392)

Human (Homo sapiens) (1036)

2r3mA01

A:1-84

Class: Mainly Alpha (13335)

Architecture: Orthogonal Bundle (10391)

Topology: Transferase(Phosphotransferase); domain 1 (1379)

Homologous Superfamily: Transferase(Phosphotransferase) domain 1 (1379)

Human (Homo sapiens) (1049)

2r3mA02

A:85-296

Asymmetric/Biological Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: PKinase (934)

Family: Pkinase (680)

Homo sapiens (Human) (521)

Pkinase-2r3mA01

A:4-286

Asymmetric/Biological Unit(hide GO term definitions)

Chain A (CDK2_HUMAN | P24941)

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:0035173	histone kinase activity	Catalysis of the transfer of a phosphate group to a histone. Histones are any of a group of water-soluble proteins found in association with the DNA of eukaroytic chromosomes.
	GO:0016301	kinase activity	Catalysis of the transfer of a phosphate group, usually from ATP, to a substrate molecule.
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
	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:0032403	protein complex binding	Interacting selectively and non-covalently with any 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:0006977	DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest	A cascade of processes induced by the cell cycle regulator phosphoprotein p53, or an equivalent protein, in response to the detection of DNA damage and resulting in the stopping or reduction in rate of the cell cycle.
	GO:0006281	DNA repair	The process of restoring DNA after damage. Genomes are subject to damage by chemical and physical agents in the environment (e.g. UV and ionizing radiations, chemical mutagens, fungal and bacterial toxins, etc.) and by free radicals or alkylating agents endogenously generated in metabolism. DNA is also damaged because of errors during its replication. A variety of different DNA repair pathways have been reported that include direct reversal, base excision repair, nucleotide excision repair, photoreactivation, bypass, double-strand break repair pathway, and mismatch repair pathway.
	GO:0006260	DNA replication	The cellular metabolic process in which a cell duplicates one or more molecules of DNA. DNA replication begins when specific sequences, known as origins of replication, are recognized and bound by initiation proteins, and ends when the original DNA molecule has been completely duplicated and the copies topologically separated. The unit of replication usually corresponds to the genome of the cell, an organelle, or a virus. The template for replication can either be an existing DNA molecule or RNA.
	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:0000086	G2/M transition of mitotic cell cycle	The mitotic cell cycle transition by which a cell in G2 commits to M phase. The process begins when the kinase activity of M cyclin/CDK complex reaches a threshold high enough for the cell cycle to proceed. This is accomplished by activating a positive feedback loop that results in the accumulation of unphosphorylated and active M cyclin/CDK complex.
	GO:0007265	Ras protein signal transduction	A series of molecular signals within the cell that are mediated by a member of the Ras superfamily of proteins switching to a GTP-bound active state.
	GO:0031100	animal organ regeneration	The regrowth of a lost or destroyed animal organ.
	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: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:0006974	cellular response to DNA damage stimulus	Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus indicating damage to its DNA from environmental insults or errors during metabolism.
	GO:0032869	cellular response to insulin stimulus	Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an insulin stimulus. Insulin is a polypeptide hormone produced by the islets of Langerhans of the pancreas in mammals, and by the homologous organs of other organisms.
	GO:0071732	cellular response to nitric oxide	Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a nitric oxide stimulus.
	GO:0007099	centriole replication	The cell cycle process in which a daughter centriole is formed perpendicular to an existing centriole. An immature centriole contains a ninefold radially symmetric array of single microtubules; mature centrioles consist of a radial array of nine microtubule triplets, doublets, or singlets depending upon the species and cell type. Duplicated centrioles also become the ciliary basal body in cells that form cilia during G0.
	GO:0051298	centrosome duplication	The replication of a centrosome, a structure comprised of a pair of centrioles and peri-centriolar material from which a microtubule spindle apparatus is organized.
	GO:0016572	histone phosphorylation	The modification of histones by addition of phosphate groups.
	GO:0002088	lens development in camera-type eye	The process whose specific outcome is the progression of the lens over time, from its formation to the mature structure. The lens is a transparent structure in the eye through which light is focused onto the retina. An example of this process is found in Mus musculus.
	GO:0051321	meiotic cell cycle	Progression through the phases of the meiotic cell cycle, in which canonically a cell replicates to produce four offspring with half the chromosomal content of the progenitor cell via two nuclear divisions.
	GO:0031571	mitotic G1 DNA damage checkpoint	A mitotic cell cycle checkpoint that detects and negatively regulates progression through the G1/S transition of the cell cycle in response to DNA damage.
	GO:0051436	negative regulation of ubiquitin-protein ligase activity involved in mitotic cell cycle	Any process that stops, prevents, or reduces the frequency, rate or extent of ubiquitin ligase activity that contributes to the mitotic cell cycle.
	GO:0018105	peptidyl-serine phosphorylation	The phosphorylation of peptidyl-serine to form peptidyl-O-phospho-L-serine.
	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:0032298	positive regulation of DNA-dependent DNA replication initiation	Any process that activates or increases the frequency, rate or extent of initiation of DNA-dependent DNA replication.
	GO:0008284	positive regulation of cell proliferation	Any process that activates or increases the rate or extent of cell proliferation.
	GO:0045893	positive regulation of transcription, DNA-templated	Any process that activates or increases the frequency, rate or extent of cellular DNA-templated transcription.
	GO:0006813	potassium ion transport	The directed movement of potassium ions (K+) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
	GO:0006468	protein phosphorylation	The process of introducing a phosphate group on to a protein.
	GO:0051726	regulation of cell cycle	Any process that modulates the rate or extent of progression through the cell cycle.
	GO:0060968	regulation of gene silencing	Any process that modulates the rate, frequency, or extent of gene silencing, the transcriptional or post-transcriptional process carried out at the cellular level that results in long-term gene inactivation.
	GO:1901796	regulation of signal transduction by p53 class mediator	Any process that modulates the frequency, rate or extent of signal transduction by p53 class mediator.
	GO:0051439	regulation of ubiquitin-protein ligase activity involved in mitotic cell cycle	A cell cycle process that modulates the frequency, rate or extent of ubiquitin ligase activity that contributes to the mitotic cell cycle.
	GO:0051591	response to cAMP	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 cAMP (cyclic AMP, adenosine 3',5'-cyclophosphate) stimulus.
	GO:0046686	response to cadmium ion	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 cadmium (Cd) ion stimulus.
	GO:0042493	response to drug	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 drug stimulus. A drug is a substance used in the diagnosis, treatment or prevention of a disease.
	GO:0051602	response to electrical stimulus	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 an electrical stimulus.
	GO:0032355	response to estradiol	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 stimulus by estradiol, a C18 steroid hormone hydroxylated at C3 and C17 that acts as a potent estrogen.
	GO:0045471	response to ethanol	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 an ethanol stimulus.
	GO:0009636	response to toxic substance	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 toxic stimulus.
cellular component
	GO:0015030	Cajal body	A class of nuclear body, first seen after silver staining by Ramon y Cajal in 1903, enriched in small nuclear ribonucleoproteins, and certain general RNA polymerase II transcription factors; ultrastructurally, they appear as a tangle of coiled, electron-dense threads roughly 0.5 micrometers in diameter; involved in aspects of snRNP biogenesis; the protein coilin serves as a marker for Cajal bodies. Some argue that Cajal bodies are the sites for preassembly of transcriptosomes, unitary particles involved in transcription and processing of RNA.
	GO:0000805	X chromosome	The sex chromosome present in both sexes of species in which the male is the heterogametic sex. Two copies of the X chromosome are present in each somatic cell of females and one copy is present in males.
	GO:0000806	Y chromosome	The sex chromosome present in males of species in which the male is the heterogametic sex; generally, the sex chromosome that pairs with the X chromosome in the heterogametic sex. The Y chromosome is absent from the cells of females and present in one copy in the somatic cells of males.
	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:0000781	chromosome, telomeric region	The terminal region of a linear chromosome that includes the telomeric DNA repeats and associated proteins.
	GO:0000793	condensed chromosome	A highly compacted molecule of DNA and associated proteins resulting in a cytologically distinct structure.
	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:0005768	endosome	A vacuole to which materials ingested by endocytosis are delivered.
	GO:0043231	intracellular membrane-bounded organelle	Organized structure of distinctive morphology and function, bounded by a single or double lipid bilayer membrane and occurring within the cell. Includes the nucleus, mitochondria, plastids, vacuoles, and vesicles. Excludes the plasma membrane.
	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:0005667	transcription factor complex	A protein complex that is capable of associating with DNA by direct binding, or via other DNA-binding proteins or complexes, and regulating transcription.

Asymmetric/Biological Unit
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	2r3m
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	CDK2_HUMAN \| P24941
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Description

Compounds

Structural Features

Chains, Units

Ligands, Modified Residues, Ions (3, 3)

Sites (1, 1)

SS Bonds (0, 0)

Cis Peptide Bonds (1, 1)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (4, 4)

PROSITE Motifs (2, 2)

Exons (7, 7)

Sequences/Alignments

Classification and Annotation

SCOP Domains (1, 1)

CATH Domains (2, 2)

Pfam Domains (1, 1)

Gene Ontology (65, 65)

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Still Images

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Databases

Analysis Tools

Related Entries

Entries Sharing at Least One Protein Chain (UniProt ID)

Related Entries Specified in the PDB File