Q13422 (IKZF1_HUMAN) Reviewed, UniProtKB/Swiss-Prot
Last modified
May 1, 2013.
Version 125.
History...
Names·Attributes·General annotation·Ontologies·Alt products·Sequence annotation·Sequences·References·Web links·Cross-refs·Entry info·DocumentsCustomize order
Names·Attributes·General annotation·Ontologies·Alt products·Sequence annotation·Sequences·References·Web links·Cross-refs·Entry info·DocumentsCustomize orderNames and origin
| Protein names | Recommended name: DNA-binding protein Ikaros Alternative name(s): Ikaros family zinc finger protein 1 Lymphoid transcription factor LyF-1 | ||||
| Gene names |
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| Organism | Homo sapiens (Human) [Reference proteome] | ||||
| Taxonomic identifier | 9606 [NCBI] | ||||
| Taxonomic lineage | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo![]() |
Protein attributes
| Sequence length | 519 AA. |
| Sequence status | Complete. |
| Protein existence | Evidence at protein level |
General annotation (Comments)
| Function | Transcription regulator of hematopoietic cell differentiation. Binds gamma-satellite DNA. Binds with higher affinity to gamma satellite A. Plays a role in the development of lymphocytes, B- and T-cells. Binds and activates the enhancer (delta-A element) of the CD3-delta gene. Repressor of the TDT (terminal deoxynucleotidyltransferase) gene during thymocyte differentiation. Regulates transcription through association with both HDAC-dependent and HDAC-independent complexes. Targets the 2 chromatin-remodeling complexes, NuRD and BAF (SWI/SNF), in a single complex (PYR complex), to the beta-globin locus in adult erythrocytes. Increases normal apoptosis in adult erythroid cells. Confers early temporal competence to retinal progenitor cells (RPCs) By similarity. Ref.8 |
| Subunit structure | Heterodimer with other IKAROS family members. Interacts with IKZF4 AND IKZF5 By similarity. Component of the chromatin-remodeling NuRD repressor complex which includes at least HDAC1, HDAC2, RBBP4, RBBP7, IKZF1, MTA2, MBD2, MBD3, MTA1L1, CHD3 and CHD4. Interacts directly with the CHD4 component of the NuRD complex. Component of the BAF (SWI/SNF) gene activator complex which includes ACTB, ARID1A, ARID1B, IKZF1, ARID1A, ARID1B, SMARCA2, SMARCA4 and at least one BAF subunit. Interacts directly with the SMARCA4 component of the BAF complex By similarity. Interacts with SUMO1; the interaction sumoylates IKAROS, promoted by PIAS2 and PIAS3. Interacts with PIAS2 (isoform alpha); the interaction promotes sumoylation and reduces transcription repression. Interacts, to a lesser extent, with PIAS3. Interacts with PPP1CC; the interaction targets PPP1CC to pericentromeric heterochromatin, dephosphorylates IKAROS, stabilizes it and prevents it from degradation. Interacts with IKZF3 By similarity. Ref.8 Ref.9 |
| Subcellular location | Nucleus. Note: In resting lymphocytes, distributed diffusely throughout the nucleus. Localizes to pericentromeric heterochromatin in proliferating cells. This localization requires DNA binding which is regulated by phosphorylation / dephosphorylation events By similarity. Isoform Ik2: Nucleus. Note: In resting lymphocytes, distributed diffusely throughout the nucleus. Localizes to pericentromeric heterochromatin in proliferating cells. This localization requires DNA binding which is regulated by phosphorylation / dephosphorylation events By similarity. |
| Tissue specificity | Abundantly expressed in thymus, spleen and peripheral blood Leukocytes and lymph nodes. Lower expression in bone marrow and small intestine. |
| Domain | The N-terminal zinc-fingers 2 and 3 are required for DNA binding as well as for targeting IKFZ1 to pericentromeric heterochromatin By similarity. The C-terminal zinc-finger domain is required for dimerization By similarity. |
| Post-translational modification | Phosphorylation controls cell-cycle progression from late G1 stage to S stage. Hyperphosphorylated during G2/M phase. Dephosphorylated state during late G1 phase. Phosphorylation on Thr-140 is required for DNA and pericentromeric location during mitosis. CK2 is the main kinase, in vitro. GSK3 and CDK may also contribute to phosphorylation of the C-terminal serine and threonine residues. Phosphorylation on these C-terminal residues reduces the DNA-binding ability. Phosphorylation/dephosphorylation events on Ser-13 and Ser-295 regulate TDT expression during thymocyte differentiation. Dephosphorylation by protein phosphatase 1 regulates stability and pericentromeric heterochromatin location. Phosphorylated in both lymphoid and non-lymphoid tissues By similarity. Sumoylated. Simulataneous sumoylation on the 2 sites results in a loss of both HDAC-dependent and HDAC-independent repression. Has no effect on pericentromeric heterochromatin location. Desumoylated by SENP1 By similarity. Polyubiquitinated By similarity. |
| Involvement in disease | Defects in IKZF1 are frequent occurrences (28.6%) in acute lymphoblasic leukemia (ALL). Such alterations or deletions lead to poor prognosis for ALL. |
| Sequence similarities | Belongs to the Ikaros C2H2-type zinc-finger protein family. Contains 6 C2H2-type zinc fingers. |
Ontologies
Alternative products
| This entry describes 7 isoforms produced by alternative splicing. [Align] [Select] | ||||||
| Isoform Ik1 (identifier: Q13422-1) This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. | ||||||
| Isoform Ik2 (identifier: Q13422-2) The sequence of this isoform differs from the canonical sequence as follows: 54-140: Missing. | ||||||
| Isoform Ik3 (identifier: Q13422-3) The sequence of this isoform differs from the canonical sequence as follows: 197-283: Missing. | ||||||
| Isoform Ik4 (identifier: Q13422-4) The sequence of this isoform differs from the canonical sequence as follows: 10-53: Missing. 197-283: Missing. | ||||||
| Isoform Ik5 (identifier: Q13422-5) The sequence of this isoform differs from the canonical sequence as follows: 141-283: Missing. | ||||||
| Isoform Ik6 (identifier: Q13422-6) The sequence of this isoform differs from the canonical sequence as follows: 54-283: Missing. | ||||||
| Isoform Ik7 (identifier: Q13422-7) The sequence of this isoform differs from the canonical sequence as follows: 197-238: Missing. |
Sequence annotation (Features)
| Feature key | Position(s) | Length | Description | Graphical view | Feature identifier | ||||
Molecule processing | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chain | 1 – 519 | 519 | DNA-binding protein Ikaros | PRO_0000047094 | |||||
Regions | |||||||||
| Zinc finger | 117 – 139 | 23 | C2H2-type 1 | ||||||
| Zinc finger | 145 – 167 | 23 | C2H2-type 2 | ||||||
| Zinc finger | 173 – 195 | 23 | C2H2-type 3 | ||||||
| Zinc finger | 201 – 224 | 24 | C2H2-type 4 | ||||||
| Zinc finger | 462 – 484 | 23 | C2H2-type 5 | ||||||
| Zinc finger | 490 – 514 | 25 | C2H2-type 6 | ||||||
| Region | 154 – 163 | 10 | Required for both high-affinity DNA binding and pericentromeric heterochromatin localization By similarity | ||||||
| Region | 180 – 195 | 16 | Required for both high-affinity DNA binding and pericentromeric heterochromatin localization By similarity | ||||||
| Region | 468 – 471 | 4 | Required for binding PP1CC By similarity | ||||||
| Compositional bias | 373 – 376 | 4 | Poly-Leu | ||||||
Sites | |||||||||
| Site | 159 | 1 | Required for both pericentromeric heterochromatin localization and complete DNA binding By similarity | ||||||
| Site | 162 | 1 | Required for both pericentromeric heterochromatin localization and complete DNA binding By similarity | ||||||
| Site | 188 | 1 | Required for both pericentromeric heterochromatin localization and DNA binding By similarity | ||||||
Amino acid modifications | |||||||||
| Modified residue | 13 | 1 | Phosphoserine By similarity | ||||||
| Modified residue | 23 | 1 | Phosphothreonine By similarity | ||||||
| Modified residue | 63 | 1 | Phosphoserine Ref.12 | ||||||
| Modified residue | 101 | 1 | Phosphoserine By similarity | ||||||
| Modified residue | 168 | 1 | Phosphoserine By similarity | ||||||
| Modified residue | 196 | 1 | Phosphoserine By similarity | ||||||
| Modified residue | 258 | 1 | Phosphoserine Ref.12 | ||||||
| Modified residue | 261 | 1 | Phosphoserine Ref.12 | ||||||
| Modified residue | 296 | 1 | Phosphoserine By similarity | ||||||
| Modified residue | 361 | 1 | Phosphoserine Ref.12 | ||||||
| Modified residue | 364 | 1 | Phosphoserine Ref.12 | ||||||
| Modified residue | 389 | 1 | Phosphoserine By similarity | ||||||
| Modified residue | 391 | 1 | Phosphoserine By similarity | ||||||
| Modified residue | 393 | 1 | Phosphoserine By similarity | ||||||
| Modified residue | 397 | 1 | Phosphoserine By similarity | ||||||
| Modified residue | 398 | 1 | Phosphothreonine By similarity | ||||||
| Cross-link | 58 | Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in SUMO) By similarity | |||||||
| Cross-link | 241 | Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in SUMO) By similarity | |||||||
Natural variations | |||||||||
| Alternative sequence | 10 – 53 | 44 | Missing in isoform Ik4. | VSP_006847 | |||||
| Alternative sequence | 54 – 283 | 230 | Missing in isoform Ik6. | VSP_006849 | |||||
| Alternative sequence | 54 – 140 | 87 | Missing in isoform Ik2. | VSP_006848 | |||||
| Alternative sequence | 141 – 283 | 143 | Missing in isoform Ik5. | VSP_006852 | |||||
| Alternative sequence | 197 – 283 | 87 | Missing in isoform Ik3 and isoform Ik4. | VSP_006850 | |||||
| Alternative sequence | 197 – 238 | 42 | Missing in isoform Ik7. | VSP_006851 | |||||
Experimental info | |||||||||
| Sequence conflict | 11 – 12 | 2 | QV → FS in AAB50683. Ref.2 | ||||||
| Sequence conflict | 214 | 1 | S → T in AAB50683. Ref.2 | ||||||
| Sequence conflict | 245 | 1 | N → K in AAB50683. Ref.2 | ||||||
| Sequence conflict | 296 | 1 | Missing in AAB50683. Ref.2 | ||||||
| Sequence conflict | 298 | 1 | S → T in AAB50683. Ref.2 | ||||||
| Sequence conflict | 352 – 355 | 4 | KPLA → RRS in AAB50683. Ref.2 | ||||||
| Sequence conflict | 372 | 1 | N → Y in AAB50683. Ref.2 | ||||||
| Sequence conflict | 420 – 426 | 7 | PHARNGL → RRAQRV in AAB50683. Ref.2 | ||||||
Sequences
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References
| « Hide 'large scale' references | |
| [1] | "Cloning and sequencing of hIk-1, a cDNA encoding a human homologue of mouse Ikaros/LyF-1." Nietfeld W., Meyerhans A. Immunol. Lett. 49:139-141(1996) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA], ALTERNATIVE SPLICING. Tissue: Bone marrow. |
| [2] | "The Ikaros gene encodes a family of lymphocyte-restricted zinc finger DNA binding proteins, highly conserved in human and mouse." Molnar A., Wu P., Largespada D.A., Vortkamp A., Scherer S., Copeland N.G., Jenkins N.A., Bruns G., Georgopoulos K. J. Immunol. 156:585-592(1996) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA]. |
| [3] | "Complete sequencing and characterization of 21,243 full-length human cDNAs." Ota T., Suzuki Y., Nishikawa T., Otsuki T., Sugiyama T., Irie R., Wakamatsu A., Hayashi K., Sato H., Nagai K., Kimura K., Makita H., Sekine M., Obayashi M., Nishi T., Shibahara T., Tanaka T., Ishii S. Sugano S.Nat. Genet. 36:40-45(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM IK2). Tissue: Thymus. |
| [4] | "Cloning of human full-length CDSs in BD Creator(TM) system donor vector." Kalnine N., Chen X., Rolfs A., Halleck A., Hines L., Eisenstein S., Koundinya M., Raphael J., Moreira D., Kelley T., LaBaer J., Lin Y., Phelan M., Farmer A. Submitted (AUG-2003) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM IK7). |
| [5] | "Human chromosome 7: DNA sequence and biology." Scherer S.W., Cheung J., MacDonald J.R., Osborne L.R., Nakabayashi K., Herbrick J.-A., Carson A.R., Parker-Katiraee L., Skaug J., Khaja R., Zhang J., Hudek A.K., Li M., Haddad M., Duggan G.E., Fernandez B.A., Kanematsu E., Gentles S. Tsui L.-C.Science 300:767-772(2003) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. |
| [6] | Mural R.J., Istrail S., Sutton G.G., Florea L., Halpern A.L., Mobarry C.M., Lippert R., Walenz B., Shatkay H., Dew I., Miller J.R., Flanigan M.J., Edwards N.J., Bolanos R., Fasulo D., Halldorsson B.V., Hannenhalli S., Turner R. Venter J.C.Submitted (SEP-2005) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. |
| [7] | "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)." The MGC Project Team Genome Res. 14:2121-2127(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM IK7). Tissue: Lymph. |
| [8] | "Ikaros DNA-binding proteins direct formation of chromatin remodeling complexes in lymphocytes." Kim J., Sif S., Jones B., Jackson A., Koipally J., Heller E., Winandy S., Viel A., Sawyer A., Ikeda T., Kingston R., Georgopoulos K. Immunity 10:345-355(1999) [PubMed] [Europe PMC] [Abstract] Cited for: IDENTIFICATION IN THE NURD COMPLEX, IDENTIFICATION IN THE BAF COMPLEX, INTERACTION WITH SMARCA4 AND CHD4, FUNCTION. |
| [9] | "Eos and pegasus, two members of the Ikaros family of proteins with distinct DNA binding activities." Perdomo J., Holmes M., Chong B., Crossley M. J. Biol. Chem. 275:38347-38354(2000) [PubMed] [Europe PMC] [Abstract] Cited for: INTERACTION WITH IKZF4 AND IKZF5. |
| [10] | "Human gamma-satellite DNA maintains open chromatin structure and protects a transgene from epigenetic silencing." Kim J.-H., Ebersole T., Kouprina N., Noskov V.N., Ohzeki J.-I., Masumoto H., Mravinac B., Sullivan B.A., Pavlicek A., Dovat S., Pack S.D., Kwon Y.-W., Flanagan P.T., Loukinov D., Lobanenkov V., Larionov V. Genome Res. 19:533-544(2009) [PubMed] [Europe PMC] [Abstract] Cited for: DNA-BINDING. |
| [11] | "Deletion of IKZF1 and prognosis in acute lymphoblastic leukemia." Mullighan C.G., Su X., Zhang J., Radtke I., Phillips L.A., Miller C.B., Ma J., Liu W., Cheng C., Schulman B.A., Harvey R.C., Chen I.-M., Clifford R.J., Carroll W.L., Reaman G., Bowman W.P., Devidas M., Gerhard D.S. Downing J.R.N. Engl. J. Med. 360:470-480(2009) [PubMed] [Europe PMC] [Abstract] Cited for: INVOLVEMENT IN ACUTE LYMPHOBLASIC LEUKEMIA. |
| [12] | "Quantitative phosphoproteomic analysis of T cell receptor signaling reveals system-wide modulation of protein-protein interactions." Mayya V., Lundgren D.H., Hwang S.-I., Rezaul K., Wu L., Eng J.K., Rodionov V., Han D.K. Sci. Signal. 2:RA46-RA46(2009) [PubMed] [Europe PMC] [Abstract] Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-63; SER-258; SER-261; SER-361 AND SER-364, MASS SPECTROMETRY. Tissue: Leukemic T-cell. |
| [13] | "Initial characterization of the human central proteome." Burkard T.R., Planyavsky M., Kaupe I., Breitwieser F.P., Buerckstuemmer T., Bennett K.L., Superti-Furga G., Colinge J. BMC Syst. Biol. 5:17-17(2011) [PubMed] [Europe PMC] [Abstract] Cited for: IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS]. |
| + | Additional computationally mapped references. |
Cross-references
Sequence databases | |
|---|---|
| EMBL GenBank DDBJ | U40462 mRNA. Translation: AAC50459.1. S80876 mRNA. Translation: AAB50683.1. AK303586 mRNA. Translation: BAG64603.1. BT009836 mRNA. Translation: AAP88838.1. CH471128 Genomic DNA. Translation: EAW60977.1. CH471128 Genomic DNA. Translation: EAW60978.1. CH471128 Genomic DNA. Translation: EAW60981.1. CH236955 Genomic DNA. Translation: EAL23900.1. CH471128 Genomic DNA. Translation: EAW60979.1. BC018349 mRNA. Translation: AAH18349.1. |
| IPI | IPI00013232. IPI00216387. IPI00216388. IPI00216389. IPI00216390. IPI00216391. IPI00216392. |
| RefSeq | NP_001207694.1. NM_001220765.1. NP_001207695.1. NM_001220766.1. NP_001207696.1. NM_001220767.1. NP_001207697.1. NM_001220768.1. NP_001207698.1. NM_001220769.1. NP_001207699.1. NM_001220770.1. NP_001207700.1. NM_001220771.1. NP_001207701.1. NM_001220772.1. NP_001207702.1. NM_001220773.1. NP_001207703.1. NM_001220774.1. NP_001207704.1. NM_001220775.1. NP_001207705.1. NM_001220776.1. NP_006051.1. NM_006060.4. |
| UniGene | Hs.435949. Hs.488251. Hs.731495. |
3D structure databases | |
| ProteinModelPortal | Q13422. |
| ModBase | Search... |
Protein-protein interaction databases | |
| IntAct | Q13422. 5 interactions. |
| STRING | 9606.ENSP00000331614. |
PTM databases | |
| PhosphoSite | Q13422. |
Polymorphism databases | |
| DMDM | 3913926. |
Proteomic databases | |
| PaxDb | Q13422. |
| PRIDE | Q13422. |
Protocols and materials databases | |
| DNASU | 10320. |
| StructuralBiologyKnowledgebase | Search... |
Genome annotation databases | |
| Ensembl | ENST00000331340; ENSP00000331614; ENSG00000185811. ENST00000343574; ENSP00000342750; ENSG00000185811. ENST00000346667; ENSP00000340080; ENSG00000185811. ENST00000349824; ENSP00000342485; ENSG00000185811. ENST00000357364; ENSP00000349928; ENSG00000185811. ENST00000359197; ENSP00000352123; ENSG00000185811. ENST00000438033; ENSP00000396554; ENSG00000185811. ENST00000439701; ENSP00000413025; ENSG00000185811. |
| GeneID | 10320. |
| KEGG | hsa:10320. |
| UCSC | uc003tow.4. human. uc003tox.4. human. uc003tpa.4. human. uc011kck.2. human. uc022acq.1. human. uc022acs.1. human. uc022acx.1. human. |
Organism-specific databases | |
| CTD | 10320. |
| GeneCards | GC07P050343. |
| HGNC | HGNC:13176. IKZF1. |
| HPA | CAB009247. |
| MIM | 603023. gene. |
| neXtProt | NX_Q13422. |
| PharmGKB | PA37748. |
| GenAtlas | Search... |
Phylogenomic databases | |
| eggNOG | NOG244744. |
| HOVERGEN | HBG004752. |
| InParanoid | Q13422. |
| KO | K09220. |
| OMA | GDKCLSD. |
| PhylomeDB | Q13422. |
Enzyme and pathway databases | |
| Pathway_Interaction_DB | nfat_tfpathway. Calcineurin-regulated NFAT-dependent transcription in lymphocytes. |
Gene expression databases | |
| ArrayExpress | Q13422. |
| Bgee | Q13422. |
| CleanEx | HS_IKZF1. |
| Genevestigator | Q13422. |
| GermOnline | ENSG00000185811. Homo sapiens. |
Family and domain databases | |
| Gene3D | 3.30.160.60. 4 hits. |
| InterPro | IPR007087. Znf_C2H2. IPR015880. Znf_C2H2-like. IPR013087. Znf_C2H2/integrase_DNA-bd. [Graphical view] |
| SMART | SM00355. ZnF_C2H2. 6 hits. [Graphical view] |
| PROSITE | PS00028. ZINC_FINGER_C2H2_1. 5 hits. PS50157. ZINC_FINGER_C2H2_2. 4 hits. [Graphical view] |
| ProtoNet | Search... |
Other | |
| ChiTaRS | IKZF1. human. |
| GenomeRNAi | 10320. |
| NextBio | 39123. |
| SOURCE | Search... |
Entry information
| Entry name | IKZF1_HUMAN | ||||||||
| Accession | Primary (citable) accession number: Q13422 Secondary accession number(s): A4D260 Q8WVA3 | ||||||||
| Entry history |
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| Entry status | Reviewed (UniProtKB/Swiss-Prot) | ||||||||
| Annotation program | Chordata Protein Annotation Program | ||||||||
| Disclaimer | Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. | ||||||||
Relevant documents
| Human chromosome 7 Human chromosome 7: entries, gene names and cross-references to MIM |
| MIM cross-references Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot |
| SIMILARITY comments Index of protein domains and families |

Clusters with
