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Flesher DA, Liu J, Wiwczar JM, Reiss K, Yang KR, Wang J, Askerka M, Gisriel CJ, Batista VS, Brudvig GW. Glycerol binding at the narrow channel of photosystem II stabilizes the low-spin S 2 state of the oxygen-evolving complex. Photosynth Res 2022; 152:167-175. [PMID: 35322325 PMCID: PMC9427693 DOI: 10.1007/s11120-022-00911-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Accepted: 03/02/2022] [Indexed: 05/11/2023]
Abstract
The oxygen-evolving complex (OEC) of photosystem II (PSII) cycles through redox intermediate states Si (i = 0-4) during the photochemical oxidation of water. The S2 state involves an equilibrium of two isomers including the low-spin S2 (LS-S2) state with its characteristic electron paramagnetic resonance (EPR) multiline signal centered at g = 2.0, and a high-spin S2 (HS-S2) state with its g = 4.1 EPR signal. The relative intensities of the two EPR signals change under experimental conditions that shift the HS-S2/LS-S2 state equilibrium. Here, we analyze the effect of glycerol on the relative stability of the LS-S2 and HS-S2 states when bound at the narrow channel of PSII, as reported in an X-ray crystal structure of cyanobacterial PSII. Our quantum mechanics/molecular mechanics (QM/MM) hybrid models of cyanobacterial PSII show that the glycerol molecule perturbs the hydrogen-bond network in the narrow channel, increasing the pKa of D1-Asp61 and stabilizing the LS-S2 state relative to the HS-S2 state. The reported results are consistent with the absence of the HS-S2 state EPR signal in native cyanobacterial PSII EPR spectra and suggest that the narrow water channel hydrogen-bond network regulates the relative stability of OEC catalytic intermediates during water oxidation.
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Affiliation(s)
- David A Flesher
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA
| | - Jinchan Liu
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA
| | - Jessica M Wiwczar
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA
| | - Krystle Reiss
- Department of Chemistry, Yale University, New Haven, CT, 05620, USA
| | - Ke R Yang
- Department of Chemistry, Yale University, New Haven, CT, 05620, USA
| | - Jimin Wang
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA
| | - Mikhail Askerka
- Department of Chemistry, Yale University, New Haven, CT, 05620, USA
| | | | - Victor S Batista
- Department of Chemistry, Yale University, New Haven, CT, 05620, USA
| | - Gary W Brudvig
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA.
- Department of Chemistry, Yale University, New Haven, CT, 05620, USA.
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Wiwczar JM, LaFountain AM, Wang J, Frank HA, Brudvig GW. Chlorophyll a with a farnesyl tail in thermophilic cyanobacteria. Photosynth Res 2017; 134:175-182. [PMID: 28741056 DOI: 10.1007/slll20-017-0425-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 07/16/2017] [Indexed: 05/25/2023]
Abstract
Photosystem II (PSII) of oxygenic photosynthetic organisms normally contains exclusively chlorophyll a (Chl a) as its major light-harvesting pigment. Chl a canonically consists of the chlorin headgroup with a 20-carbon, 4-isoprene unit, phytyl tail. We have examined the 1.9 Å crystal structure of PSII from thermophilic cyanobacteria reported by Shen and coworkers in 2012 (PDB accession of 3ARC/3WU2). A newly refined electron density map from this structure, presented here, reveals that some assignments of the cofactors may be different from those modeled in the 3ARC/3WU2 structure, including a specific Chl a that appears to have a truncated tail by one isoprene unit. We provide experimental evidence using high-performance liquid chromatography and mass spectrometry for a small population of Chl a esterified to a 15-carbon farnesyl tail in PSII of thermophilic cyanobacteria.
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Affiliation(s)
- Jessica M Wiwczar
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520-8107, USA
| | - Amy M LaFountain
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269-3060, USA
| | - Jimin Wang
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520-8107, USA
| | - Harry A Frank
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269-3060, USA
| | - Gary W Brudvig
- Department of Chemistry, Yale University, New Haven, CT, 06520-8107, USA.
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Wiwczar JM, LaFountain AM, Wang J, Frank HA, Brudvig GW. Chlorophyll a with a farnesyl tail in thermophilic cyanobacteria. Photosynth Res 2017; 134:175-182. [PMID: 28741056 PMCID: PMC5832022 DOI: 10.1007/s11120-017-0425-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 07/16/2017] [Indexed: 05/19/2023]
Abstract
Photosystem II (PSII) of oxygenic photosynthetic organisms normally contains exclusively chlorophyll a (Chl a) as its major light-harvesting pigment. Chl a canonically consists of the chlorin headgroup with a 20-carbon, 4-isoprene unit, phytyl tail. We have examined the 1.9 Å crystal structure of PSII from thermophilic cyanobacteria reported by Shen and coworkers in 2012 (PDB accession of 3ARC/3WU2). A newly refined electron density map from this structure, presented here, reveals that some assignments of the cofactors may be different from those modeled in the 3ARC/3WU2 structure, including a specific Chl a that appears to have a truncated tail by one isoprene unit. We provide experimental evidence using high-performance liquid chromatography and mass spectrometry for a small population of Chl a esterified to a 15-carbon farnesyl tail in PSII of thermophilic cyanobacteria.
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Affiliation(s)
- Jessica M Wiwczar
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520-8107, USA
| | - Amy M LaFountain
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269-3060, USA
| | - Jimin Wang
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520-8107, USA
| | - Harry A Frank
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269-3060, USA
| | - Gary W Brudvig
- Department of Chemistry, Yale University, New Haven, CT, 06520-8107, USA.
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Shah DI, Takahashi-Makise N, Cooney JD, Li L, Schultz IJ, Pierce EL, Narla A, Seguin A, Hattangadi SM, Medlock AE, Langer NB, Dailey TA, Hurst SN, Faccenda D, Wiwczar JM, Heggers SK, Vogin G, Chen W, Chen C, Campagna DR, Brugnara C, Zhou Y, Ebert BL, Danial NN, Fleming MD, Ward DM, Campanella M, Dailey HA, Kaplan J, Paw BH. Mitochondrial Atpif1 regulates haem synthesis in developing erythroblasts. Nature 2012; 491:608-12. [PMID: 23135403 PMCID: PMC3504625 DOI: 10.1038/nature11536] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Accepted: 08/23/2012] [Indexed: 12/18/2022]
Abstract
Defects in the availability of haem substrates or the catalytic activity of the terminal enzyme in haem biosynthesis, ferrochelatase (Fech), impair haem synthesis and thus cause human congenital anaemias. The interdependent functions of regulators of mitochondrial homeostasis and enzymes responsible for haem synthesis are largely unknown. To investigate this we used zebrafish genetic screens and cloned mitochondrial ATPase inhibitory factor 1 (atpif1) from a zebrafish mutant with profound anaemia, pinotage (pnt (tq209)). Here we describe a direct mechanism establishing that Atpif1 regulates the catalytic efficiency of vertebrate Fech to synthesize haem. The loss of Atpif1 impairs haemoglobin synthesis in zebrafish, mouse and human haematopoietic models as a consequence of diminished Fech activity and elevated mitochondrial pH. To understand the relationship between mitochondrial pH, redox potential, [2Fe-2S] clusters and Fech activity, we used genetic complementation studies of Fech constructs with or without [2Fe-2S] clusters in pnt, as well as pharmacological agents modulating mitochondrial pH and redox potential. The presence of [2Fe-2S] cluster renders vertebrate Fech vulnerable to perturbations in Atpif1-regulated mitochondrial pH and redox potential. Therefore, Atpif1 deficiency reduces the efficiency of vertebrate Fech to synthesize haem, resulting in anaemia. The identification of mitochondrial Atpif1 as a regulator of haem synthesis advances our understanding of the mechanisms regulating mitochondrial haem homeostasis and red blood cell development. An ATPIF1 deficiency may contribute to important human diseases, such as congenital sideroblastic anaemias and mitochondriopathies.
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Affiliation(s)
- Dhvanit I. Shah
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Naoko Takahashi-Makise
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah 84312, USA
| | - Jeffrey D. Cooney
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Liangtao Li
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah 84312, USA
| | - Iman J. Schultz
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Eric L. Pierce
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Anupama Narla
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
- Department of Medicine, Division of Hematology-Oncology, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Alexandra Seguin
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah 84312, USA
| | - Shilpa M. Hattangadi
- Department of Medicine, Division of Hematology-Oncology, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
- Whitehead Institute for Biomedical Research and Massachusetts Institute of Technology, Cambridge, Massachusetts 02142, USA
| | - Amy E. Medlock
- Biomedical and Health Sciences Institute, Departments of Microbiology, Biochemistry & Molecular Biology, University of Georgia, Athens, Georgia 30602, USA
| | - Nathaniel B. Langer
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Tamara A. Dailey
- Biomedical and Health Sciences Institute, Departments of Microbiology, Biochemistry & Molecular Biology, University of Georgia, Athens, Georgia 30602, USA
| | - Slater N. Hurst
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Danilo Faccenda
- Royal Veterinary College, University of London and University College London Consortium for Mitochondrial Research, London, NW1 0TU, UK
| | - Jessica M. Wiwczar
- Department of Cancer Biology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Spencer K. Heggers
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Guillaume Vogin
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Wen Chen
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Caiyong Chen
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Dean R. Campagna
- Department of Pathology, Boston Children’s Hospital, Harvard Medical School, Boston Massachusetts 02115, USA
| | - Carlo Brugnara
- Department of Laboratory Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Yi Zhou
- Department of Medicine, Division of Hematology-Oncology, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Benjamin L. Ebert
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Nika N. Danial
- Department of Cancer Biology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Mark D. Fleming
- Department of Pathology, Boston Children’s Hospital, Harvard Medical School, Boston Massachusetts 02115, USA
| | - Diane M. Ward
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah 84312, USA
| | - Michelangelo Campanella
- Royal Veterinary College, University of London and University College London Consortium for Mitochondrial Research, London, NW1 0TU, UK
| | - Harry A. Dailey
- Biomedical and Health Sciences Institute, Departments of Microbiology, Biochemistry & Molecular Biology, University of Georgia, Athens, Georgia 30602, USA
| | - Jerry Kaplan
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah 84312, USA
| | - Barry H. Paw
- Department of Medicine, Division of Hematology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
- Department of Medicine, Division of Hematology-Oncology, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
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