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Medlock AE, Shiferaw MT, Marcero JR, Vashisht AA, Wohlschlegel JA, Phillips JD, Dailey HA. Identification of the Mitochondrial Heme Metabolism Complex. PLoS One 2015; 10:e0135896. [PMID: 26287972 PMCID: PMC4545792 DOI: 10.1371/journal.pone.0135896] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 07/28/2015] [Indexed: 11/21/2022] Open
Abstract
Heme is an essential cofactor for most organisms and all metazoans. While the individual enzymes involved in synthesis and utilization of heme are fairly well known, less is known about the intracellular trafficking of porphyrins and heme, or regulation of heme biosynthesis via protein complexes. To better understand this process we have undertaken a study of macromolecular assemblies associated with heme synthesis. Herein we have utilized mass spectrometry with coimmunoprecipitation of tagged enzymes of the heme biosynthetic pathway in a developing erythroid cell culture model to identify putative protein partners. The validity of these data obtained in the tagged protein system is confirmed by normal porphyrin/heme production by the engineered cells. Data obtained are consistent with the presence of a mitochondrial heme metabolism complex which minimally consists of ferrochelatase, protoporphyrinogen oxidase and aminolevulinic acid synthase-2. Additional proteins involved in iron and intermediary metabolism as well as mitochondrial transporters were identified as potential partners in this complex. The data are consistent with the known location of protein components and support a model of transient protein-protein interactions within a dynamic protein complex.
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Affiliation(s)
- Amy E. Medlock
- Biomedical and Health Sciences Institute, University of Georgia, Athens, Georgia, United States of America
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia, United States of America
- GRU-UGA Medical Partnership, University of Georgia, Athens, Georgia, United States of America
- * E-mail:
| | - Mesafint T. Shiferaw
- Biomedical and Health Sciences Institute, University of Georgia, Athens, Georgia, United States of America
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia, United States of America
- GRU-UGA Medical Partnership, University of Georgia, Athens, Georgia, United States of America
| | - Jason R. Marcero
- Biomedical and Health Sciences Institute, University of Georgia, Athens, Georgia, United States of America
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia, United States of America
| | - Ajay A. Vashisht
- Department of Biological Chemistry and the Institute of Genomics and Proteomics, University of California Los Angeles, Los Angeles, California, United States of America
| | - James A. Wohlschlegel
- Department of Biological Chemistry and the Institute of Genomics and Proteomics, University of California Los Angeles, Los Angeles, California, United States of America
| | - John D. Phillips
- Division of Hematology, Department of Medicine, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
| | - Harry A. Dailey
- Biomedical and Health Sciences Institute, University of Georgia, Athens, Georgia, United States of America
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia, United States of America
- Department of Microbiology, University of Georgia, Athens, Georgia, United States of America
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Conte S, Katayama S, Vesterlund L, Karimi M, Dimitriou M, Jansson M, Mortera-Blanco T, Unneberg P, Papaemmanuil E, Sander B, Skoog T, Campbell P, Walfridsson J, Kere J, Hellström-Lindberg E. Aberrant splicing of genes involved in haemoglobin synthesis and impaired terminal erythroid maturation in SF3B1 mutated refractory anaemia with ring sideroblasts. Br J Haematol 2015; 171:478-90. [PMID: 26255870 PMCID: PMC4832260 DOI: 10.1111/bjh.13610] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 06/25/2015] [Indexed: 02/06/2023]
Abstract
Refractory anaemia with ring sideroblasts (RARS) is distinguished by hyperplastic inefficient erythropoiesis, aberrant mitochondrial ferritin accumulation and anaemia. Heterozygous mutations in the spliceosome gene SF3B1 are found in a majority of RARS cases. To explore the link between SF3B1 mutations and anaemia, we studied mutated RARS CD34+ marrow cells with regard to transcriptome sequencing, splice patterns and mutational allele burden during erythroid differentiation. Transcriptome profiling during early erythroid differentiation revealed a marked up‐regulation of genes involved in haemoglobin synthesis and in the oxidative phosphorylation process, and down‐regulation of mitochondrial ABC transporters compared to normal bone marrow. Moreover, mis‐splicing of genes involved in transcription regulation, particularly haemoglobin synthesis, was confirmed, indicating a compromised haemoglobinization during RARS erythropoiesis. In order to define the phase during which erythroid maturation of SF3B1 mutated cells is most affected, we assessed allele burden during erythroid differentiation in vitro and in vivo and found that SF3B1 mutated erythroblasts showed stable expansion until late erythroblast stage but that terminal maturation to reticulocytes was significantly reduced. In conclusion, SF3B1 mutated RARS progenitors display impaired splicing with potential downstream consequences for genes of key importance for haemoglobin synthesis and terminal erythroid differentiation.
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Affiliation(s)
- Simona Conte
- Karolinska Institutet, Department of Medicine (Huddinge), Centre for Hematology and Regenerative Medicine, Stockholm, Sweden
| | - Shintaro Katayama
- Karolinska Institutet, Department of Biosciences and Nutrition and Center for Innovative Medicine, Stockholm, Sweden
| | - Liselotte Vesterlund
- Karolinska Institutet, Department of Biosciences and Nutrition and Center for Innovative Medicine, Stockholm, Sweden
| | - Mohsen Karimi
- Karolinska Institutet, Department of Medicine (Huddinge), Centre for Hematology and Regenerative Medicine, Stockholm, Sweden
| | - Marios Dimitriou
- Karolinska Institutet, Department of Medicine (Huddinge), Centre for Hematology and Regenerative Medicine, Stockholm, Sweden
| | - Monika Jansson
- Karolinska Institutet, Department of Medicine (Huddinge), Centre for Hematology and Regenerative Medicine, Stockholm, Sweden
| | - Teresa Mortera-Blanco
- Karolinska Institutet, Department of Medicine (Huddinge), Centre for Hematology and Regenerative Medicine, Stockholm, Sweden
| | - Per Unneberg
- Department of Biochemistry and Biophysics, Science for Life Laboratory, Stockholm, Sweden
| | - Elli Papaemmanuil
- Cancer Genetics & Genomics, The Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK
| | - Birgitta Sander
- Karolinska Institutet, Department of Laboratory Medicine, Division of Pathology, Stockholm, Sweden
| | - Tiina Skoog
- Karolinska Institutet, Department of Biosciences and Nutrition and Center for Innovative Medicine, Stockholm, Sweden
| | - Peter Campbell
- Cancer Genetics & Genomics, The Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK
| | - Julian Walfridsson
- Karolinska Institutet, Department of Medicine (Huddinge), Centre for Hematology and Regenerative Medicine, Stockholm, Sweden
| | - Juha Kere
- Karolinska Institutet, Department of Biosciences and Nutrition and Center for Innovative Medicine, Stockholm, Sweden
| | - Eva Hellström-Lindberg
- Karolinska Institutet, Department of Medicine (Huddinge), Centre for Hematology and Regenerative Medicine, Stockholm, Sweden
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53
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Compartmentalization of iron between mitochondria and the cytosol and its regulation. Eur J Cell Biol 2015; 94:292-308. [DOI: 10.1016/j.ejcb.2015.05.003] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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54
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Sun F, Cheng Y, Chen C. Regulation of heme biosynthesis and transport in metazoa. SCIENCE CHINA-LIFE SCIENCES 2015; 58:757-64. [PMID: 26100009 DOI: 10.1007/s11427-015-4885-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 04/22/2015] [Indexed: 02/08/2023]
Abstract
Heme is an iron-containing tetrapyrrole that plays a critical role in regulating a variety of biological processes including oxygen and electron transport, gas sensing, signal transduction, biological clock, and microRNA processing. Most metazoan cells synthesize heme via a conserved pathway comprised of eight enzyme-catalyzed reactions. Heme can also be acquired from food or extracellular environment. Cellular heme homeostasis is maintained through the coordinated regulation of synthesis, transport, and degradation. This review presents the current knowledge of the synthesis and transport of heme in metazoans and highlights recent advances in the regulation of these pathways.
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Affiliation(s)
- FengXiu Sun
- College of Life Sciences and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, 310058, China
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Chung J, Bauer DE, Ghamari A, Nizzi CP, Deck KM, Kingsley PD, Yien YY, Huston NC, Chen C, Schultz IJ, Dalton AJ, Wittig JG, Palis J, Orkin SH, Lodish HF, Eisenstein RS, Cantor AB, Paw BH. The mTORC1/4E-BP pathway coordinates hemoglobin production with L-leucine availability. Sci Signal 2015; 8:ra34. [PMID: 25872869 PMCID: PMC4402725 DOI: 10.1126/scisignal.aaa5903] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
In multicellular organisms, the mechanisms by which diverse cell types acquire distinct amino acids and how cellular function adapts to their availability are fundamental questions in biology. We found that increased neutral essential amino acid (NEAA) uptake was a critical component of erythropoiesis. As red blood cells matured, expression of the amino acid transporter gene Lat3 increased, which increased NEAA import. Inadequate NEAA uptake by pharmacologic inhibition or RNAi-mediated knockdown of LAT3 triggered a specific reduction in hemoglobin production in zebrafish embryos and murine erythroid cells through the mTORC1 (mammalian target of rapamycin complex 1)/4E-BP (eukaryotic translation initiation factor 4E-binding protein) pathway. CRISPR-mediated deletion of members of the 4E-BP family in murine erythroid cells rendered them resistant to mTORC1 and LAT3 inhibition and restored hemoglobin production. These results identify a developmental role for LAT3 in red blood cells and demonstrate that mTORC1 serves as a homeostatic sensor that couples hemoglobin production at the translational level to sufficient uptake of NEAAs, particularly L-leucine.
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MESH Headings
- Adaptor Proteins, Signal Transducing
- Amino Acid Transport Systems, Basic/genetics
- Amino Acid Transport Systems, Basic/metabolism
- Animals
- Animals, Genetically Modified
- CRISPR-Cas Systems
- Carrier Proteins/genetics
- Carrier Proteins/metabolism
- Cell Cycle Proteins
- Cell Line, Tumor
- Cells, Cultured
- Embryo, Mammalian/blood supply
- Embryo, Mammalian/embryology
- Embryo, Mammalian/metabolism
- Embryo, Nonmammalian/embryology
- Embryo, Nonmammalian/metabolism
- Erythroid Cells/metabolism
- Erythropoiesis/genetics
- Eukaryotic Initiation Factors/genetics
- Eukaryotic Initiation Factors/metabolism
- Gene Expression Regulation, Developmental
- HEK293 Cells
- Hemoglobins/genetics
- Hemoglobins/metabolism
- Humans
- Immunoblotting
- Leucine/metabolism
- Mechanistic Target of Rapamycin Complex 1
- Mice
- Microscopy, Confocal
- Multiprotein Complexes/genetics
- Multiprotein Complexes/metabolism
- Phosphoproteins/genetics
- Phosphoproteins/metabolism
- RNA Interference
- Reverse Transcriptase Polymerase Chain Reaction
- Signal Transduction/genetics
- TOR Serine-Threonine Kinases/genetics
- TOR Serine-Threonine Kinases/metabolism
- Zebrafish
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Affiliation(s)
- Jacky Chung
- Division of Hematology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Daniel E Bauer
- Division of Hematology-Oncology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA. Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Alireza Ghamari
- Division of Hematology-Oncology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA. Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Christopher P Nizzi
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Kathryn M Deck
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Paul D Kingsley
- Department of Pediatrics, Center for Pediatric Biomedical Research, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Yvette Y Yien
- Division of Hematology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Nicholas C Huston
- Division of Hematology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Caiyong Chen
- Division of Hematology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Iman J Schultz
- Division of Hematology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Arthur J Dalton
- Division of Hematology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Johannes G Wittig
- Division of Hematology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - James Palis
- Department of Pediatrics, Center for Pediatric Biomedical Research, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Stuart H Orkin
- Division of Hematology-Oncology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA. Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Harvey F Lodish
- Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
| | - Richard S Eisenstein
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Alan B Cantor
- Division of Hematology-Oncology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA. Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Barry H Paw
- Division of Hematology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA. Division of Hematology-Oncology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA. Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.
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