Regulatory Phosphorylation of Ikaros by Bruton's Tyrosine Kinase

Diminished Ikaros function has been implicated in the pathogenesis of acute lymphoblastic leukemia (ALL), the most common form of childhood cancer. Therefore, a stringent regulation of Ikaros is of paramount importance for normal lymphocyte ontogeny. Here we provide genetic and biochemical evidence...

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Published inPloS one Vol. 8; no. 8; p. e71302
Main Authors Ma, Hong, Qazi, Sanjive, Ozer, Zahide, Zhang, Jian, Ishkhanian, Rita, Uckun, Fatih M.
Format Journal Article
LanguageEnglish
Published United States Public Library of Science 19.08.2013
Public Library of Science (PLoS)
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Online AccessGet full text
ISSN1932-6203
1932-6203
DOI10.1371/journal.pone.0071302

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Abstract Diminished Ikaros function has been implicated in the pathogenesis of acute lymphoblastic leukemia (ALL), the most common form of childhood cancer. Therefore, a stringent regulation of Ikaros is of paramount importance for normal lymphocyte ontogeny. Here we provide genetic and biochemical evidence for a previously unknown function of Bruton's tyrosine kinase (BTK) as a partner and posttranslational regulator of Ikaros, a zinc finger-containing DNA-binding protein that plays a pivotal role in immune homeostasis. We demonstrate that BTK phosphorylates Ikaros at unique phosphorylation sites S214 and S215 in the close vicinity of its zinc finger 4 (ZF4) within the DNA binding domain, thereby augmenting its nuclear localization and sequence-specific DNA binding activity. Our results further demonstrate that BTK-induced activating phosphorylation is critical for the optimal transcription factor function of Ikaros.
AbstractList Diminished Ikaros function has been implicated in the pathogenesis of acute lymphoblastic leukemia (ALL), the most common form of childhood cancer. Therefore, a stringent regulation of Ikaros is of paramount importance for normal lymphocyte ontogeny. Here we provide genetic and biochemical evidence for a previously unknown function of Bruton's tyrosine kinase (BTK) as a partner and posttranslational regulator of Ikaros, a zinc finger-containing DNA-binding protein that plays a pivotal role in immune homeostasis. We demonstrate that BTK phosphorylates Ikaros at unique phosphorylation sites S214 and S215 in the close vicinity of its zinc finger 4 (ZF4) within the DNA binding domain, thereby augmenting its nuclear localization and sequence-specific DNA binding activity. Our results further demonstrate that BTK-induced activating phosphorylation is critical for the optimal transcription factor function of Ikaros.Diminished Ikaros function has been implicated in the pathogenesis of acute lymphoblastic leukemia (ALL), the most common form of childhood cancer. Therefore, a stringent regulation of Ikaros is of paramount importance for normal lymphocyte ontogeny. Here we provide genetic and biochemical evidence for a previously unknown function of Bruton's tyrosine kinase (BTK) as a partner and posttranslational regulator of Ikaros, a zinc finger-containing DNA-binding protein that plays a pivotal role in immune homeostasis. We demonstrate that BTK phosphorylates Ikaros at unique phosphorylation sites S214 and S215 in the close vicinity of its zinc finger 4 (ZF4) within the DNA binding domain, thereby augmenting its nuclear localization and sequence-specific DNA binding activity. Our results further demonstrate that BTK-induced activating phosphorylation is critical for the optimal transcription factor function of Ikaros.
Diminished Ikaros function has been implicated in the pathogenesis of acute lymphoblastic leukemia (ALL), the most common form of childhood cancer. Therefore, a stringent regulation of Ikaros is of paramount importance for normal lymphocyte ontogeny. Here we provide genetic and biochemical evidence for a previously unknown function of Bruton's tyrosine kinase (BTK) as a partner and posttranslational regulator of Ikaros, a zinc finger-containing DNA-binding protein that plays a pivotal role in immune homeostasis. We demonstrate that BTK phosphorylates Ikaros at unique phosphorylation sites S214 and S215 in the close vicinity of its zinc finger 4 (ZF4) within the DNA binding domain, thereby augmenting its nuclear localization and sequence-specific DNA binding activity. Our results further demonstrate that BTK-induced activating phosphorylation is critical for the optimal transcription factor function of Ikaros.
Audience Academic
Author Ma, Hong
Ozer, Zahide
Zhang, Jian
Qazi, Sanjive
Ishkhanian, Rita
Uckun, Fatih M.
AuthorAffiliation 2 Department of Biology and Bioinformatics Program, Gustavus Adolphus College, St. Peter, Minnesota, United States of America
5 Department of Pediatrics, University of Southern California Keck School of Medicine, Los Angeles, California, United States of America
4 Medicinal Bioinformatics Center, Shanghai Jiatong University, Shanghai, China
1 Systems Immunobiology Laboratory, Children's Center for Cancer and Blood Diseases, Children's Hospital Los Angeles, Los Angeles, California, United States of America
3 Molecular Oncology Program, Parker Hughes Institute, St. Paul, Minnesota, United States of America
Westmead Millennium Institute, University of Sydney, Australia
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– name: 1 Systems Immunobiology Laboratory, Children's Center for Cancer and Blood Diseases, Children's Hospital Los Angeles, Los Angeles, California, United States of America
– name: 5 Department of Pediatrics, University of Southern California Keck School of Medicine, Los Angeles, California, United States of America
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Conceived and designed the experiments: HM SQ JZ ZO RI FMU. Performed the experiments: HM SQ JZ ZO RI FMU. Analyzed the data: HM SQ JZ FMU. Contributed reagents/materials/analysis tools: JZ. Wrote the paper: HM SQ JZ ZO RI FMU. Reviewed and revised the paper: HM SQ ZO JZ RI FMU.
Competing Interests: The authors have declared that no competing interests exist.
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Snippet Diminished Ikaros function has been implicated in the pathogenesis of acute lymphoblastic leukemia (ALL), the most common form of childhood cancer. Therefore,...
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SubjectTerms Acute lymphoblastic leukemia
Agammaglobulinaemia Tyrosine Kinase
Animals
Apoptosis
B-Lymphocytes - metabolism
B-Lymphocytes - pathology
Bioinformatics
Biology
Biotechnology
Blood diseases
Bruton's tyrosine kinase
Cancer
Cell Line, Tumor
Cell Nucleus - genetics
Cell Nucleus - metabolism
Children
Children & youth
Cooperation
Deoxyribonucleic acid
DNA
DNA binding proteins
DNA-binding protein
Gene Expression Regulation, Leukemic
Genes
Homeostasis
Human subjects
Humans
Ikaros protein
Ikaros Transcription Factor - genetics
Ikaros Transcription Factor - metabolism
Infant
Kinases
Laboratories
Leukemia
Localization
Lymphatic leukemia
Lymphocytes
Lymphoma
Medical prognosis
Medicine
Mice
Nucleotide sequence
Ontogeny
Pathogenesis
Phenols (Class of compounds)
Phosphorylation
Precursor B-Cell Lymphoblastic Leukemia-Lymphoma - genetics
Precursor B-Cell Lymphoblastic Leukemia-Lymphoma - metabolism
Precursor B-Cell Lymphoblastic Leukemia-Lymphoma - pathology
Protein Binding
Protein-tyrosine kinase
Protein-Tyrosine Kinases - genetics
Protein-Tyrosine Kinases - metabolism
Proteins
Signal Transduction
Transcription factors
Tyrosine
Young Adult
Zinc
Zinc finger proteins
Zinc Fingers
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Title Regulatory Phosphorylation of Ikaros by Bruton's Tyrosine Kinase
URI https://www.ncbi.nlm.nih.gov/pubmed/23977012
https://www.proquest.com/docview/1430785914
https://www.proquest.com/docview/1428270453
https://pubmed.ncbi.nlm.nih.gov/PMC3747153
https://doaj.org/article/607ba95772884b01bdd3ba20110abf62
http://dx.doi.org/10.1371/journal.pone.0071302
Volume 8
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