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Cao S, Yang Y, He L, Hang Y, Yan X, Shi H, Wu J, Ouyang Z. Cryo-EM structures of mitochondrial ABC transporter ABCB10 in apo and biliverdin-bound form. Nat Commun 2023; 14:2030. [PMID: 37041204 PMCID: PMC10090120 DOI: 10.1038/s41467-023-37851-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 04/03/2023] [Indexed: 04/13/2023] Open
Abstract
ABCB10, a member of ABC transporter superfamily that locates in the inner membrane of mitochondria, plays crucial roles in hemoglobin synthesis, antioxidative stress and stabilization of the iron transporter mitoferrin-1. Recently, it was found that ABCB10 is a mitochondrial biliverdin exporter. However, the molecular mechanism of biliverdin export by ABCB10 remains elusive. Here we report the cryo-EM structures of ABCB10 in apo (ABCB10-apo) and biliverdin-bound form (ABCB10-BV) at 3.67 Å and 2.85 Å resolution, respectively. ABCB10-apo adopts a wide-open conformation and may thus represent the apo form structure. ABCB10-BV forms a closed conformation and biliverdin situates in a hydrophobic pocket in one protomer and bridges the interaction through hydrogen bonds with the opposing one. We also identify cholesterols sandwiched by BVs and discuss the export dynamics based on these structural and biochemical observations.
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Affiliation(s)
- Sheng Cao
- Wuxi Biortus Biosciences Co. Ltd., 6 Dongsheng Western Road, 214437, Jiangyin, Jiangsu, China
| | - Yihu Yang
- Wuxi Biortus Biosciences Co. Ltd., 6 Dongsheng Western Road, 214437, Jiangyin, Jiangsu, China
| | - Lili He
- Department of Pathogen Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, 430030, Wuhan, Hubei Province, China
| | - Yumo Hang
- Department of Pathogen Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, 430030, Wuhan, Hubei Province, China
| | - Xiaodong Yan
- Wuxi Biortus Biosciences Co. Ltd., 6 Dongsheng Western Road, 214437, Jiangyin, Jiangsu, China
| | - Hui Shi
- Wuxi Biortus Biosciences Co. Ltd., 6 Dongsheng Western Road, 214437, Jiangyin, Jiangsu, China
| | - Jiaquan Wu
- Wuxi Biortus Biosciences Co. Ltd., 6 Dongsheng Western Road, 214437, Jiangyin, Jiangsu, China
| | - Zhuqing Ouyang
- Department of Pathogen Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, 430030, Wuhan, Hubei Province, China.
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Yan Q, Shen Y, Yang X. Cryo-EM Structure of AMP-PNP-bound Human Mitochondrial ATP-binding cassette transporter ABCB7. J Struct Biol 2022; 214:107832. [PMID: 35041979 DOI: 10.1016/j.jsb.2022.107832] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 01/06/2022] [Accepted: 01/10/2022] [Indexed: 12/31/2022]
Abstract
ATP-binding cassette subfamily B member 7 (ABCB7) is localized in the inner membrane of mitochondria, playing a critical role in iron metabolism. Here, we determined the structure of the nonhydrolyzable ATP analog adenosine-5'-(β-γ-imido) triphosphate (AMP-PNP) bound human ABCB7 at 3.3 Å by single-particle electron cryo-microscopy (cryo-EM). The AMP-PNP-bound human ABCB7 shows an inverted V-shaped homodimeric architecture with an inward-facing open conformation. One AMP-PNP molecule and Mg2+ were identified in each nucleotide-binding domain (NBD) of the hABCB7 monomer. Moreover, four disease-causing missense mutations of human ABCB7 have been mapped to the structure, creating a hotspot map for X-linked sideroblastic anemia and ataxia disease. Our results provide a structural basis for further understanding the transport mechanism of the mitochondrial ABC transporter.
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Affiliation(s)
- Qinqin Yan
- State Key Laboratory of Medicinal Chemical Biology and College of Life Sciences, Nankai University, Tianjin 300350, China
| | - Yuequan Shen
- State Key Laboratory of Medicinal Chemical Biology and College of Life Sciences, Nankai University, Tianjin 300350, China; Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China
| | - Xue Yang
- State Key Laboratory of Medicinal Chemical Biology and College of Life Sciences, Nankai University, Tianjin 300350, China.
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Conneely LJ, Mauleon R, Mieog J, Barkla BJ, Kretzschmar T. Characterization of the Cannabis sativa glandular trichome proteome. PLoS One 2021; 16:e0242633. [PMID: 33793557 PMCID: PMC8016307 DOI: 10.1371/journal.pone.0242633] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 03/13/2021] [Indexed: 12/15/2022] Open
Abstract
Cannabis sativa has been cultivated since antiquity as a source of fibre, food and medicine. The recent resurgence of C. sativa as a cash crop is mainly driven by the medicinal and therapeutic properties of its resin, which contains compounds that interact with the human endocannabinoid system. Compared to other medicinal crops of similar value, however, little is known about the biology of C. sativa. Glandular trichomes are small hair-like projections made up of stalk and head tissue and are responsible for the production of the resin in C. sativa. Trichome productivity, as determined by C. sativa resin yield and composition, is only beginning to be understood at the molecular level. In this study the proteomes of glandular trichome stalks and heads, were investigated and compared to the proteome of the whole flower tissue, to help further elucidate C. sativa glandular trichome biochemistry. The data suggested that the floral tissue acts as a major source of carbon and energy to the glandular trichome head sink tissue, supplying sugars which drive secondary metabolite biosynthesis. The trichome stalk seems to play only a limited role in secondary metabolism and acts as both source and sink.
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Affiliation(s)
- Lee James Conneely
- Southern Cross Plant Science, Southern Cross University, Lismore, NSW, Australia
| | - Ramil Mauleon
- Southern Cross Plant Science, Southern Cross University, Lismore, NSW, Australia
| | - Jos Mieog
- Southern Cross Plant Science, Southern Cross University, Lismore, NSW, Australia
| | - Bronwyn J. Barkla
- Southern Cross Plant Science, Southern Cross University, Lismore, NSW, Australia
| | - Tobias Kretzschmar
- Southern Cross Plant Science, Southern Cross University, Lismore, NSW, Australia
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Peng M, Ostrovsky J, Kwon YJ, Polyak E, Licata J, Tsukikawa M, Marty E, Thomas J, Felix CA, Xiao R, Zhang Z, Gasser DL, Argon Y, Falk MJ. Inhibiting cytosolic translation and autophagy improves health in mitochondrial disease. Hum Mol Genet 2015; 24:4829-47. [PMID: 26041819 DOI: 10.1093/hmg/ddv207] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Accepted: 06/01/2015] [Indexed: 01/03/2023] Open
Abstract
Mitochondrial respiratory chain (RC) disease therapies directed at intra-mitochondrial pathology are largely ineffective. Recognizing that RC dysfunction invokes pronounced extra-mitochondrial transcriptional adaptations, particularly involving dysregulated translation, we hypothesized that translational dysregulation is itself contributing to the pathophysiology of RC disease. Here, we investigated the activities, and effects from direct inhibition, of a central translational regulator (mTORC1) and its downstream biological processes in diverse genetic and pharmacological models of RC disease. Our data identify novel mechanisms underlying the cellular pathogenesis of RC dysfunction, including the combined induction of proteotoxic stress, the ER stress response and autophagy. mTORC1 inhibition with rapamycin partially ameliorated renal disease in B6.Pdss2(kd/kd) mice with complexes I-III/II-III deficiencies, improved viability and mitochondrial physiology in gas-1(fc21) nematodes with complex I deficiency, and rescued viability across a variety of RC-inhibited human cells. Even more effective was probucol, a PPAR-activating anti-lipid drug that we show also inhibits mTORC1. However, directly inhibiting mTORC1-regulated downstream activities yielded the most pronounced and sustained benefit. Partial inhibition of translation by cycloheximide, or of autophagy by lithium chloride, rescued viability, preserved cellular respiratory capacity and induced mitochondrial translation and biogenesis. Cycloheximide also ameliorated proteotoxic stress via a uniquely selective reduction of cytosolic protein translation. RNAseq-based transcriptome profiling of treatment effects in gas-1(fc21) mutants provide further evidence that these therapies effectively restored altered translation and autophagy pathways toward that of wild-type animals. Overall, partially inhibiting cytosolic translation and autophagy offer novel treatment strategies to improve health across the diverse array of human diseases whose pathogenesis involves RC dysfunction.
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Affiliation(s)
- Min Peng
- Division of Human Genetics, Department of Pediatrics and Department of Genetics and
| | | | | | | | - Joseph Licata
- Division of Human Genetics, Department of Pediatrics and
| | - Mai Tsukikawa
- Division of Human Genetics, Department of Pediatrics and
| | - Eric Marty
- Division of Human Genetics, Department of Pediatrics and
| | - Jeffrey Thomas
- Division of Cell Pathology, Department of Pathology, The Children's Hospital of Philadelphia and Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA and
| | - Carolyn A Felix
- Division of Oncology, Department of Pediatrics, The Children's Hospital of Philadelphia and University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Rui Xiao
- Department of Biostatistics and Epidemiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Zhe Zhang
- Center for Biomedical Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | | | - Yair Argon
- Division of Cell Pathology, Department of Pathology, The Children's Hospital of Philadelphia and Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA and
| | - Marni J Falk
- Division of Human Genetics, Department of Pediatrics and
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Knöller AS, Murphy AS. ABC Transporters and Their Function at the Plasma Membrane. THE PLANT PLASMA MEMBRANE 2011. [DOI: 10.1007/978-3-642-13431-9_16] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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