1
|
Basinski JJ, Bone SE, Klein AR, Thongsomboon W, Mitchell V, Shukle JT, Druschel GK, Thompson A, Aristilde L. Unraveling iron oxides as abiotic catalysts of organic phosphorus recycling in soil and sediment matrices. Nat Commun 2024; 15:5930. [PMID: 39025840 PMCID: PMC11258345 DOI: 10.1038/s41467-024-47931-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Accepted: 04/16/2024] [Indexed: 07/20/2024] Open
Abstract
In biogeochemical phosphorus cycling, iron oxide minerals are acknowledged as strong adsorbents of inorganic and organic phosphorus. Dephosphorylation of organic phosphorus is attributed only to biological processes, but iron oxides could also catalyze this reaction. Evidence of this abiotic catalysis has relied on monitoring products in solution, thereby ignoring iron oxides as both catalysts and adsorbents. Here we apply high-resolution mass spectrometry and X-ray absorption spectroscopy to characterize dissolved and particulate phosphorus species, respectively. In soil and sediment samples reacted with ribonucleotides, we uncover the abiotic production of particulate inorganic phosphate associated specifically with iron oxides. Reactions of various organic phosphorus compounds with the different minerals identified in the environmental samples reveal up to ten-fold greater catalytic reactivities with iron oxides than with silicate and aluminosilicate minerals. Importantly, accounting for inorganic phosphate both in solution and mineral-bound, the dephosphorylarion rates of iron oxides were within reported enzymatic rates in soils. Our findings thus imply a missing abiotic axiom for organic phosphorus mineralization in phosphorus cycling.
Collapse
Affiliation(s)
- Jade J Basinski
- Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL, USA
| | - Sharon E Bone
- Stanford Synchrotron Radiation Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - Annaleise R Klein
- Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL, USA
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, Clayton, VIC, Australia
| | - Wiriya Thongsomboon
- Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL, USA
- Department of Chemistry, Mahasarakham University, Mahasarakham, Thailand
| | - Valerie Mitchell
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, Clayton, VIC, Australia
| | - John T Shukle
- Department of Earth Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
- ZevRoss Spatial Analysis, Ithaca, NY, USA
| | - Gregory K Druschel
- Department of Earth Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Aaron Thompson
- Department of Crop and Soil Sciences, University of Georgia, Athens, GA, USA
| | - Ludmilla Aristilde
- Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL, USA.
| |
Collapse
|
2
|
Guanidine- and purine-functionalized ligands of FeIIIZnII complexes: effects on the hydrolysis of DNA. J Biol Inorg Chem 2019; 24:675-691. [DOI: 10.1007/s00775-019-01680-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 06/21/2019] [Indexed: 01/01/2023]
|
3
|
Dutta N, Haldar S, Vijaykumar G, Paul S, Chattopadhyay AP, Carrella L, Bera M. Phosphatase-like Activity of Tetranuclear Iron(III) and Zinc(II) Complexes. Inorg Chem 2018; 57:10802-10820. [PMID: 30130107 DOI: 10.1021/acs.inorgchem.8b01441] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nityananda Dutta
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal-741235, India
| | - Shobhraj Haldar
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal-741235, India
| | - Gonela Vijaykumar
- Department of Chemical Sciences, Indian Institute of Science Education & Research Kolkata, Mohanpur, West Bengal-741246, India
| | - Suvendu Paul
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal-741235, India
| | | | - Luca Carrella
- Institut fur Anorganische Chemie und Analytische Chemie, Johannes-Gutenberg Universitat Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Manindranath Bera
- Department of Chemistry, University of Kalyani, Kalyani, West Bengal-741235, India
| |
Collapse
|
4
|
Ji JN, Chen SL. μ3-Oxo stabilized by three metal cations is a sufficient nucleophile for enzymatic hydrolysis of phosphate monoesters. Dalton Trans 2016; 45:2517-22. [PMID: 26699843 DOI: 10.1039/c5dt03899e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Diverse species have previously been proposed to be effective nucleophiles in the enzymatic hydrolysis of phosphate esters. A novel penta-metal cluster (two Fe(3+) and three Ca(2+)) was recently discovered in the active site of PhoX alkaline phosphatase, with the revelation of the architecture of μ3-oxo bridging one Ca(2+) and two antiferromagnetically coupled Fe(3+). In this work, using density functional theory calculations, the μ3-oxo stabilized by three cations has been demonstrated to be a new type of effective nucleophile. The calculations give strong support to the "ping-pong" mechanism involving the nucleophilic attack of the μ3-oxo on the substrate phosphor and the subsequent hydrolysis of the covalent phospho-enzyme intermediate. A base mechanism with the μ3-oxo acting as a general base to activate an additional water molecule has further been demonstrated to be inaccessible. The results advance the understanding of the enzymatic hydrolysis of phosphate esters and may give important inspiration for the exploration of multinuclear biomimetic catalysts.
Collapse
Affiliation(s)
- Jian-Nan Ji
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry, Beijing Institute of Technology, Beijing 100081, China.
| | | |
Collapse
|
5
|
Bosch S, Comba P, Gahan LR, Hanson GR, Noble C, Schenk G, Wadepohl H. Selective Coordination of Gallium(III), Zinc(II), and Copper(II) by an Asymmetric Dinucleating Ligand: A Model for Metallophosphatases. Chemistry 2015; 21:18269-79. [DOI: 10.1002/chem.201503348] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Indexed: 01/09/2023]
|
6
|
Shangpung S, Kumar A, Asthana M, Dey A, Kurbah SD, Basumatary D, Lal R. Crystal structure and catalytic studies of heterodinuclear complex [CuZn(μ-OAc)(μ-OH)(μ-OH2)(bpy)2](ClO4)2. INORG CHEM COMMUN 2015. [DOI: 10.1016/j.inoche.2015.05.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
7
|
Das B, Daver H, Singh A, Singh R, Haukka M, Demeshko S, Meyer F, Lisensky G, Jarenmark M, Himo F, Nordlander E. A Heterobimetallic FeIIIMnIIComplex of an Unsymmetrical Dinucleating Ligand: A Structural and Functional Model Complex for the Active Site of Purple Acid Phosphatase of Sweet Potato. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301375] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
8
|
Zhang H, Ma Y, Yu JG. Theoretical studies on the mechanism of activation of phosphoprotein phosphatases and purple acid phosphatases suggest an evolutionary strategy to survive in acidic environments. J Biol Inorg Chem 2013; 18:1019-26. [DOI: 10.1007/s00775-013-1053-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 10/08/2013] [Indexed: 01/21/2023]
|
9
|
Faridoon, Hussein WM, Ul Islam N, Guddat LW, Schenk G, McGeary RP. Penicillin inhibitors of purple acid phosphatase. Bioorg Med Chem Lett 2012; 22:2555-9. [DOI: 10.1016/j.bmcl.2012.01.123] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 01/26/2012] [Accepted: 01/30/2012] [Indexed: 10/14/2022]
|
10
|
Smith SJ, Peralta RA, Jovito R, Horn A, Bortoluzzi AJ, Noble CJ, Hanson GR, Stranger R, Jayaratne V, Cavigliasso G, Gahan LR, Schenk G, Nascimento OR, Cavalett A, Bortolotto T, Razzera G, Terenzi H, Neves A, Riley MJ. Spectroscopic and Catalytic Characterization of a Functional FeIIIFeII Biomimetic for the Active Site of Uteroferrin and Protein Cleavage. Inorg Chem 2012; 51:2065-78. [DOI: 10.1021/ic201711p] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
| | | | | | | | | | | | | | - Robert Stranger
- Research School of Chemistry, Australian National University, Canberra 0200, Australia
| | - Vidura Jayaratne
- Research School of Chemistry, Australian National University, Canberra 0200, Australia
| | - Germán Cavigliasso
- Research School of Chemistry, Australian National University, Canberra 0200, Australia
| | | | - Gerhard Schenk
- Department of Chemistry, National University of Ireland—Maynooth, Maynooth County, Kildare, Ireland
| | - Otaciro R. Nascimento
- Instituto de Física, Universidade de São Paulo, 13560-970 São
Carlos, São Paulo, Brazil
| | | | | | | | | | | | | |
Collapse
|
11
|
Alberto ME, Marino T, Russo N, Sicilia E, Toscano M. The performance of density functional based methods in the description of selected biological systems and processes. Phys Chem Chem Phys 2012; 14:14943-53. [DOI: 10.1039/c2cp41836c] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
12
|
Structural, spectroscopic, and magnetic properties of a diphenolate-bridged FeIIINiII complex showing excellent phosphodiester cleavage activity. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.09.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
13
|
Bioinspired FeIIICdII and FeIIIHgII complexes: Synthesis, characterization and promiscuous catalytic activity evaluation. J Inorg Biochem 2011; 105:1740-52. [DOI: 10.1016/j.jinorgbio.2011.08.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 08/20/2011] [Accepted: 08/22/2011] [Indexed: 11/19/2022]
|
14
|
Mohd-Pahmi SH, Hussein WM, Schenk G, McGeary RP. Synthesis, modelling and kinetic assays of potent inhibitors of purple acid phosphatase. Bioorg Med Chem Lett 2011; 21:3092-4. [DOI: 10.1016/j.bmcl.2011.03.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2011] [Revised: 03/07/2011] [Accepted: 03/08/2011] [Indexed: 11/26/2022]
|
15
|
Jarenmark M, Haukka M, Demeshko S, Tuczek F, Zuppiroli L, Meyer F, Nordlander E. Synthesis, Characterization, and Reactivity Studies of Heterodinuclear Complexes Modeling Active Sites in Purple Acid Phospatases. Inorg Chem 2011; 50:3866-87. [DOI: 10.1021/ic1020324] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Martin Jarenmark
- Inorganic Chemistry Research Group, Chemical Physics, Center for Chemistry and Chemical Engineering, Lund University, Box 124, SE-221 00 Lund, Sweden
| | - Matti Haukka
- Department of Chemistry, University of Eastern Finland, P.O. Box 111, FI-80101 Joensuu, Finland
| | - Serhiy Demeshko
- Institute for Inorganic Chemistry, Georg-August-University Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
| | - Felix Tuczek
- Institute for Inorganic Chemistry, Christian-Albrechts-University Kiel, Olshausenstrasse 40, D-24098 Kiel, Germany
| | - Luca Zuppiroli
- Dipartimento di Chimica “A. Mangini”, Universita di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy
| | - Franc Meyer
- Institute for Inorganic Chemistry, Georg-August-University Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
| | - Ebbe Nordlander
- Inorganic Chemistry Research Group, Chemical Physics, Center for Chemistry and Chemical Engineering, Lund University, Box 124, SE-221 00 Lund, Sweden
| |
Collapse
|
16
|
|
17
|
|
18
|
Alberto ME, Marino T, Ramos MJ, Russo N. Atomistic details of the Catalytic Mechanism of Fe(III)−Zn(II) Purple Acid Phosphatase. J Chem Theory Comput 2010; 6:2424-33. [DOI: 10.1021/ct100187c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Marta E. Alberto
- Dipartimento di Chimica, Università della Calabria,Via P. Bucci, cubo 14c, 87036 Arcavacata di Rende (CS), Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite−Centro d’Eccellenza MIUR, Italy and REQUIMTE, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Tiziana Marino
- Dipartimento di Chimica, Università della Calabria,Via P. Bucci, cubo 14c, 87036 Arcavacata di Rende (CS), Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite−Centro d’Eccellenza MIUR, Italy and REQUIMTE, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Maria J. Ramos
- Dipartimento di Chimica, Università della Calabria,Via P. Bucci, cubo 14c, 87036 Arcavacata di Rende (CS), Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite−Centro d’Eccellenza MIUR, Italy and REQUIMTE, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Nino Russo
- Dipartimento di Chimica, Università della Calabria,Via P. Bucci, cubo 14c, 87036 Arcavacata di Rende (CS), Centro di Calcolo ad Alte Prestazioni per Elaborazioni Parallele e Distribuite−Centro d’Eccellenza MIUR, Italy and REQUIMTE, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| |
Collapse
|
19
|
|
20
|
Xavier FR, Neves A, Casellato A, Peralta RA, Bortoluzzi AJ, Szpoganicz B, Severino PC, Terenzi H, Tomkowicz Z, Ostrovsky S, Haase W, Ozarowski A, Krzystek J, Telser J, Schenk G, Gahan LR. Unsymmetrical FeIIICoII and GaIIICoII Complexes as Chemical Hydrolases: Biomimetic Models for Purple Acid Phosphatases (PAPs). Inorg Chem 2009; 48:7905-21. [DOI: 10.1021/ic900831q] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Fernando R. Xavier
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Ademir Neves
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Annelise Casellato
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Rosely A. Peralta
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Adailton J. Bortoluzzi
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Bruno Szpoganicz
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Patricia C. Severino
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Hernán Terenzi
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Zbigniew Tomkowicz
- Institute of Physics, Reymonta 4, Jagiellonian University, PL-30-059 Kraków, Poland
- Institut für Physikalische Chemie, Technische Universität Darmstadt, Petersenstrasse 20, D-64287 Darmstadt, Germany
| | - Sergei Ostrovsky
- Institute of Applied Physics, Academy of Sciences of Moldova, Academy Str. 5, 2028 Chisinau, Moldava
- Institut für Physikalische Chemie, Technische Universität Darmstadt, Petersenstrasse 20, D-64287 Darmstadt, Germany
| | - Wolfgang Haase
- Institut für Physikalische Chemie, Technische Universität Darmstadt, Petersenstrasse 20, D-64287 Darmstadt, Germany
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310
| | - Jerzy Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605
| | - Gerhard Schenk
- School of Molecular and Microbial Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Lawrence R. Gahan
- School of Molecular and Microbial Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia
| |
Collapse
|
21
|
Mitić N, Noble CJ, Gahan LR, Hanson GR, Schenk G. Metal-Ion Mutagenesis: Conversion of a Purple Acid Phosphatase from Sweet Potato to a Neutral Phosphatase with the Formation of an Unprecedented Catalytically Competent MnIIMnII Active Site. J Am Chem Soc 2009; 131:8173-9. [DOI: 10.1021/ja900797u] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nataša Mitić
- School of Chemistry and Molecular Biosciences, and Centre of Magnetic Resonance, The University of Queensland, Queensland, Australia, 4072
| | - Christopher J. Noble
- School of Chemistry and Molecular Biosciences, and Centre of Magnetic Resonance, The University of Queensland, Queensland, Australia, 4072
| | - Lawrence R. Gahan
- School of Chemistry and Molecular Biosciences, and Centre of Magnetic Resonance, The University of Queensland, Queensland, Australia, 4072
| | - Graeme R. Hanson
- School of Chemistry and Molecular Biosciences, and Centre of Magnetic Resonance, The University of Queensland, Queensland, Australia, 4072
| | - Gerhard Schenk
- School of Chemistry and Molecular Biosciences, and Centre of Magnetic Resonance, The University of Queensland, Queensland, Australia, 4072
| |
Collapse
|
22
|
Hadler KS, Tanifum EA, Yip SHC, Mitić N, Guddat LW, Jackson CJ, Gahan LR, Nguyen K, Carr PD, Ollis DL, Hengge AC, Larrabee JA, Schenk G. Substrate-promoted formation of a catalytically competent binuclear center and regulation of reactivity in a glycerophosphodiesterase from Enterobacter aerogenes. J Am Chem Soc 2008; 130:14129-38. [PMID: 18831553 PMCID: PMC4887195 DOI: 10.1021/ja803346w] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The glycerophosphodiesterase (GpdQ) from Enterobacter aerogenes is a promiscuous binuclear metallohydrolase that catalyzes the hydrolysis of mono-, di-, and triester substrates, including some organophosphate pesticides and products of the degradation of nerve agents. GpdQ has attracted recent attention as a promising enzymatic bioremediator. Here, we have investigated the catalytic mechanism of this versatile enzyme using a range of techniques. An improved crystal structure (1.9 A resolution) illustrates the presence of (i) an extended hydrogen bond network in the active site, and (ii) two possible nucleophiles, i.e., water/hydroxide ligands, coordinated to one or both metal ions. While it is at present not possible to unambiguously distinguish between these two possibilities, a reaction mechanism is proposed whereby the terminally bound H2O/OH(-) acts as the nucleophile, activated via hydrogen bonding by the bridging water molecule. Furthermore, the presence of substrate promotes the formation of a catalytically competent binuclear center by significantly enhancing the binding affinity of one of the metal ions in the active site. Asn80 appears to display coordination flexibility that may modulate enzyme activity. Kinetic data suggest that the rate-limiting step occurs after hydrolysis, i.e., the release of the phosphate moiety and the concomitant dissociation of one of the metal ions and/or associated conformational changes. Thus, it is proposed that GpdQ employs an intricate regulatory mechanism for catalysis, where coordination flexibility in one of the two metal binding sites is essential for optimal activity.
Collapse
Affiliation(s)
- Kieran S. Hadler
- School of Molecular and Microbial Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Eric A. Tanifum
- Department of Chemistry and Biochemistry, Utah State University, Logan, UT, 84322, USA
| | - Sylvia Hsu-Chen Yip
- Research School of Chemistry, Australian National University, Canberra, ACT, 0200, Australia
| | - Nataša Mitić
- School of Molecular and Microbial Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Luke W. Guddat
- School of Molecular and Microbial Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Colin J. Jackson
- Research School of Chemistry, Australian National University, Canberra, ACT, 0200, Australia
| | - Lawrence R. Gahan
- School of Molecular and Microbial Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Kelly Nguyen
- Research School of Chemistry, Australian National University, Canberra, ACT, 0200, Australia
| | - Paul D. Carr
- Research School of Chemistry, Australian National University, Canberra, ACT, 0200, Australia
| | - David L. Ollis
- Research School of Chemistry, Australian National University, Canberra, ACT, 0200, Australia
| | - Alvan C. Hengge
- Department of Chemistry and Biochemistry, Utah State University, Logan, UT, 84322, USA
| | - James A. Larrabee
- Department of Chemistry and Biochemistry, Middlebury College, Middlebury, VT, 05753, USA
| | - Gerhard Schenk
- School of Molecular and Microbial Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| |
Collapse
|
23
|
Jarenmark M, Kappen S, Haukka M, Nordlander E. Symmetrical and unsymmetrical dizinc complexes as models for the active sites of hydrolytic enzymes. Dalton Trans 2008:993-6. [DOI: 10.1039/b713664a] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
24
|
Buchholz RR, Etienne ME, Dorgelo A, Mirams RE, Smith SJ, Chow SY, Hanton LR, Jameson GB, Schenk G, Gahan LR. A structural and catalytic model for zinc phosphoesterases. Dalton Trans 2008:6045-54. [DOI: 10.1039/b806391e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
25
|
Omi R, Goto M, Miyahara I, Manzoku M, Ebihara A, Hirotsu K. Crystal structure of monofunctional histidinol phosphate phosphatase from Thermus thermophilus HB8. Biochemistry 2007; 46:12618-27. [PMID: 17929834 DOI: 10.1021/bi701204r] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Monofunctional histidinol phosphate phosphatase from Thermus thermophilus HB8, which catalyzes the dephosphorylation of l-histidinol phosphate, belongs to the PHP family, together with the PHP domain of bacterial DNA polymerase III and family X DNA polymerase. We have determined the structures of the complex with a sulfate ion, the complex with a phosphate ion, and the unliganded form at 1.6, 2.1, and 1.8 A resolution, respectively. The enzyme exists as a tetramer, and the subunit consists of a distorted (betaalpha)7 barrel with one linker and one C-terminal tail. Three metal sites located on the C-terminal side of the barrel are occupied by Fe1, Fe2, and Zn ions, respectively, forming a trinuclear metal center liganded by seven histidines, one aspartate, one glutamate, and one hydroxide with two Fe ions bridged by the hydroxide. In the complexes, the sulfate or phosphate ion is coordinated to three metal ions, resulting in octahedral, trigonal bipyramidal, and tetrahedral geometries around the Fe1, Fe2, and Zn ions, respectively. The ligand residues are derived from the four motifs that characterize the PHP family and from two motifs conserved in histidinol phosphate phosphatases. The (betaalpha)7 barrel and the metal cluster are closely related in nature and architecture to the (betaalpha)8 barrel and the mononuclear or dinuclear metal center in the amidohydrolase superfamily, respectively. The coordination behavior of the phosphate ion toward the metal center supports the mechanism in which the bridging hydroxide makes a direct attack on the substrate phosphate tridentately bound to the two Fe ions and Zn ion to hydrolyze the phosphoester bond.
Collapse
Affiliation(s)
- Rie Omi
- RIKEN Spring-8 Center, Harima Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | | | | | | | | | | |
Collapse
|
26
|
Boudalis AK, Aston RE, Smith SJ, Mirams RE, Riley MJ, Schenk G, Blackman AG, Hanton LR, Gahan LR. Synthesis and characterization of the tetranuclear iron(III) complex of a new asymmetric multidentate ligand. A structural model for purple acid phosphatases. Dalton Trans 2007:5132-9. [PMID: 17985020 DOI: 10.1039/b709293h] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ligand, 2-((2-hydroxy-5-methyl-3-((pyridin-2-ylmethylamino)methyl)benzyl)(2-hydroxybenzyl)amino)acetic acid (H(3)HPBA), which contains a donor atom set that mimics that of the active site of purple acid phosphatase is described. Reaction of H(3)HPBA with iron(III) or iron(II) salts results in formation of the tetranuclear complex, [Fe(4)(HPBA)(2)(OAc)(2)(mu-O)(mu-OH)(OH(2))(2)]ClO(4) x 5H(2)O. X-Ray structural analysis reveals the cation consists of four iron(III) ions, two HPBA(3-) ligands, two bridging acetate ligands, a bridging oxide ion and a bridging hydroxide ion. Each binucleating HPBA(3-) ligand coordinates two structurally distinct hexacoordinate iron(III) ions. The two metal ions coordinated to a HPBA(3-) ligand are linked to the two iron(III) metal ions of a second, similar binuclear unit by intramolecular oxide and hydroxide bridging moieties to form a tetramer. The complex has been further characterised by elemental analysis, mass spectrometry, UV-vis and MCD spectroscopy, X-ray crystallography, magnetic susceptibility measurements and variable-temperature Mössbauer spectroscopy.
Collapse
Affiliation(s)
- Athanassios K Boudalis
- Institute of Materials Science, NCSR "Demokritos", 15310 Aghia Paraskevi Attikis, Greece
| | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Mitić N, Smith SJ, Neves A, Guddat LW, Gahan LR, Schenk G. The catalytic mechanisms of binuclear metallohydrolases. Chem Rev 2007; 106:3338-63. [PMID: 16895331 DOI: 10.1021/cr050318f] [Citation(s) in RCA: 362] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Natasa Mitić
- School of Molecular and Microbial Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | | | | | | | | | | |
Collapse
|
28
|
Smith SJ, Casellato A, Hadler KS, Mitić N, Riley MJ, Bortoluzzi AJ, Szpoganicz B, Schenk G, Neves A, Gahan LR. The reaction mechanism of the Ga(III)Zn(II) derivative of uteroferrin and corresponding biomimetics. J Biol Inorg Chem 2007; 12:1207-20. [PMID: 17701232 DOI: 10.1007/s00775-007-0286-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2007] [Accepted: 08/02/2007] [Indexed: 11/24/2022]
Abstract
Purple acid phosphatase from pig uterine fluid (uteroferrin), a representative of the diverse family of binuclear metallohydrolases, requires a heterovalent Fe(III)Fe(II) center for catalytic activity. The active-site structure and reaction mechanism of this enzyme were probed with a combination of methods including metal ion replacement and biomimetic studies. Specifically, the asymmetric ligand 2-bis{[(2-pyridylmethyl)-aminomethyl]-6-[(2-hydroxybenzyl)(2-pyridylmethyl)]aminomethyl}-4-methylphenol and two symmetric analogues that contain the softer and harder sites of the asymmetric unit were employed to assess the site selectivity of the trivalent and divalent metal ions using (71)Ga NMR, mass spectrometry and X-ray crystallography. An exclusive preference of the harder site of the asymmetric ligand for the trivalent metal ion was observed. Comparison of the reactivities of the biomimetics with Ga(III)Zn(II) and Fe(III)Zn(II) centers indicates a higher turnover for the former, suggesting that the M(III)-bound hydroxide acts as the reaction-initiating nucleophile. Catalytically active Ga(III)Zn(II) and Fe(III)Zn(II) derivatives were also generated in the active site of uteroferrin. As in the case of the biomimetics, the Ga(III) derivative has increased reactivity, and a comparison of the pH dependence of the catalytic parameters of native uteroferrin and its metal ion derivatives supports a flexible mechanistic strategy whereby both the mu-(hydr)oxide and the terminal M(III)-bound hydroxide can act as nucleophiles, depending on the metal ion composition, the geometry of the second coordination sphere and the substrate.
Collapse
Affiliation(s)
- Sarah J Smith
- School of Molecular and Microbial Sciences, The University of Queensland, St Lucia, QLD, Australia
| | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
|
30
|
Tong Y, Guo M. Cloning and characterization of a novel periplasmic heme-transport protein from the human pathogen Pseudomonas aeruginosa. J Biol Inorg Chem 2007; 12:735-50. [PMID: 17387526 DOI: 10.1007/s00775-007-0226-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2006] [Accepted: 02/27/2007] [Indexed: 11/25/2022]
Abstract
Successful iron acquisition plays a crucial role in bacterial virulence. Numerous Gram-negative pathogenic bacteria have developed a novel heme-acquisition system to steal iron from hosts. This system involves a cell-surface heme receptor, a periplasmic heme-transport protein (HTP) and inner-membrane proteins typical for ATP binding cassette transporters. We have cloned the gene encoding a periplasmic HTP from Pseudomonas aeruginosa, overexpressed it in Escherichia coli and purified it as a 33-kDa His-tagged protein. Heme-staining and heme-content assays reveal that the isolated HTP contains approximately 50% heme-bound and apo forms. The heme is noncovalently attached and can be transferred to apomyoglobin in vitro. Electron paramagnetic resonance and UV-vis spectroscopies indicate a five-coordinate, high-spin, ferric heme in HTP. HTP is reduced by dithionite but not by either dithiothreitol or ascorbate. Fluorescence and circular dichroism spectroscopies indicate a well-ordered structure for the HTP and a conformational change upon heme binding to apo-HTP. This was confirmed by limited proteolysis assays. Apo-HTP binds heme or protoporphyrin IX at 1:1 ratio with high affinity (K (d) approximately 1.2 and 14 nM, respectively). A BLASTP search revealed approximately 52 putative bacterial periplasmic heme transporters, which can be grouped into six classes, most of which are associated with pathogenic bacteria. Multiple sequence alignment reveals that these HTPs share low sequence similarity and no conserved common binding motif for heme ligation. However, a tyrosine residue (Y71) is highly conserved in the HTP sequences, which is likely an axial heme ligand in HTPs. Mutagenesis studies support Y71-heme iron ligation in the recombinant HTP.
Collapse
Affiliation(s)
- Yong Tong
- Department of Chemistry and Biochemistry, University of Massachusetts, Dartmouth, MA 02747-2300, USA
| | | |
Collapse
|
31
|
Kumaran D, Bonanno JB, Burley SK, Swaminathan S. Crystal structure of phosphatidylglycerophosphatase (PGPase), a putative membrane-bound lipid phosphatase, reveals a novel binuclear metal binding site and two "proton wires". Proteins 2006; 64:851-62. [PMID: 16838328 DOI: 10.1002/prot.21039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Phosphatidylglycerophosphatase (PGPase), an enzyme involved in lipid metabolism, catalyzes formation of phosphatidylglycerol from phosphatidylglycerophosphate. Phosphatidylglycerol is a multifunctional phospholipid, found in the biological membranes of many organisms. Here, we report the crystal structure of Listeria monocytogenes PGPase at 1.8 A resolution. PGPase, an all-helical molecule, forms a homotetramer. Each protomer contains an independent active site with two metal ions, Ca(2+) and Mg(2+), forming a hetero-binuclear center located in a hydrophilic cavity near the surface of the molecule. The binuclear center, conserved ligands, metal-bound water molecules, and an Asp-His dyad form the active site. The catalytic mechanism of this enzyme is likely to proceed via binuclear metal activated nucleophilic water. The binuclear metal-binding active-site environment of this structure should provide insights into substrate binding and metal-dependent catalysis. A long channel with inter-linked linear water chains, termed "proton wires," is observed at the tetramer interface. Comparison of similar water chain structures in photosynthetic reaction centers (RCs), Cytochrome f, gramicidin, and bacteriorhodopsin, suggests that PGPase may conduct protons via proton wires.
Collapse
Affiliation(s)
- Desigan Kumaran
- Biology Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | | | | | | |
Collapse
|
32
|
Biswas P, Ghosh M, Dutta SK, Flörke U, Nag K. Synthesis, Reactivities, and Magnetostructural Properties of FeIII, FeIII−O−FeIII, and ZnIIFeIII−O−FeIIIZnII Complexes of a Tetraiminodiphenolate Macrocycle. Inorg Chem 2006; 45:4830-44. [PMID: 16749848 DOI: 10.1021/ic060183b] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The mononuclear iron(III) complexes [Fe(LH2)(H2O)Cl](ClO4)2.2H2O (1) and [Fe(LH2)(H2O)2](ClO4)3.H2O (2) have been prepared by reacting [Pb(LH(2))](ClO4)2 with FeCl3.6H2O and Fe(ClO(4))(3).6H(2)O, respectively. Complex 2 upon treatment with 1 equiv of alkali produces the oxo-bridged dimer [{Fe(LH2)(H2O)}2(mu-O)](ClO4)4.2H2O (3). In these compounds, LH2 refers to the tetraiminodiphenol macrocycle in the zwitterionic form whose two uncoordinated imine nitrogens are protonated and hydrogen-bonded to the metal-bound phenolate oxygens. The aqua ligands of complexes 1-3 get exchanged in acetonitrile. Reaction equilibria involving binding and exchange of the terminal ligands (Cl-/H2O/CH3CN) in these complexes have been studied spectrophotometrically. The equilibrium constant for the aquation reaction (K(aq)) [1]2+ + H2O <==> [2]3+ + Cl- in acetonitrile is 8.65(5) M, and the binding constant (K(Cl)-) for the reaction [1]2+ + Cl- [1Cl]+ + CH3CN is 4.75(5) M. The pK(D) value for the dimerization reaction 2[2]3+ + 2OH- <==> [3]4+ + 3H(2)O in 1:1 acetonitrile-water is 9.38(10). Complexes 1-3 upon reaction with Zn(ClO4)(2).6H(2)O and sodium acetate (OAc), pivalate (OPiv), or bis(4-nitrophenyl)phosphate (BNPP) produce the heterobimetallic complexes [{FeLZn(mu-X)}2(mu-O)](ClO4)2, where X = OAc (4), OPiv (5), and BNPP (6). The pseudo-first-order rate constant (k(obs)) for the formation of 4 at 25 degrees C from either 1 or 3 with an excess of Zn(OAc)2.2H2O in 1:1 acetonitrile-water at pH 6.6 is found to be the same with k(obs) = 1.6(2) x 10(-4) s(-1). The X-ray crystal structures of 3, 4, and 6 have been determined, although the structure determination of 3 was severely affected because of heavy disordering. In 3, the Fe-O-Fe angle is 168.6(6) degrees, while it is exactly 180.0 degrees in 4 and 6. Cyclic and square-wave voltammetric (CV and SWV) measurements have been carried out for complexes 1-4 in acetonitrile. The variation of the solvent composition (acetonitrile-water) has a profound effect on the E(1/2) and DeltaE(p) values. The binding of an additional chloride ion to an iron(III) center in 1-3 is accompanied by a remarkable shift of E(1/2) to more negative values. The observation of quasi-reversible CV for complexes containing a Fe(III)-O-Fe(III) unit (3 and 4) indicates that in the electrochemical time scale unusual Fe(III)-O-Fe(II) is produced. The 1H NMR spectra of complexes 3-6 exhibit hyperfine-shifted signals in the range 0-90 ppm with similar features. The metal-hydrogen distances obtained from T(1) measurements are in good agreement with the crystallographic data. Variable-temperature (2-300 K) magnetic susceptibility measurements carried out for 3 and 4 indicate strong antiferromagnetic exchange interaction (H = -2JS1.S2) between the high-spin iron(III) centers in the Fe-O-Fe unit with J = -114 cm(-1) (3) and -107 cm(-1) (4).
Collapse
Affiliation(s)
- Papu Biswas
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | | | | | | | | |
Collapse
|
33
|
Ljusberg J, Wang Y, Lång P, Norgård M, Dodds R, Hultenby K, Ek-Rylander B, Andersson G. Proteolytic Excision of a Repressive Loop Domain in Tartrate-resistant Acid Phosphatase by Cathepsin K in Osteoclasts. J Biol Chem 2005; 280:28370-81. [PMID: 15929988 DOI: 10.1074/jbc.m502469200] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Tartrate-resistant acid phosphatase (TRAP) is a metallophosphoesterase participating in osteoclast-mediated bone turnover. Activation of TRAP is associated with the redox state of the di-iron metal center as well as with limited proteolytic cleavage in an exposed loop domain. The cysteine proteinases cathepsin B, L, K, and S as well as the matrix metalloproteinase-2, -9, -13, and -14 are expressed by osteoclasts and/or other bone cells and have been implicated in the turnover of bone and cartilage. To identify proteases that could act as activators of TRAP in bone, we report here that cathepsins K and L, in contrast to the matrix metalloproteinases, efficiently cleaved and activated recombinant TRAP in vitro. Activation of TRAP by cathepsin K/L was because of increases in catalytic activity, substrate affinity, and sensitivity to reductants. Processing by cathepsin K occurred sequentially by an initial excision of the loop peptide Gly(143)-Gly(160) followed by the removal of a Val(161)-Ala(162) dipeptide at the N terminus of the C-terminal 16-kDa TRAP subunit. Cathepsin L initially released a shorter Gln(151)-Gly(160) peptide and completed processing at Ser(145) or Gly(143) at the C terminus of the N-terminal 23-kDa TRAP subunit and at Arg(163) at the N terminus of the C-terminal 16-kDa TRAP subunit. Mutation of Ser(145) to Ala partly mimicked the effect of proteolysis on catalytic activity, identifying Ser(145) as well as Asp(146) (Funhoff, E. G., Ljusberg, J., Wang, Y., Andersson, G., and Averill, B. A. (2001) Biochemistry 40, 11614-11622) as repressive amino acids of the loop region to maintain the TRAP enzyme in a catalytically latent state. The C-terminal sequence of TRAP isolated from rat bone was consistent with cathepsin K-mediated processing in vivo. Moreover, cathepsin K, but not cathepsin L, co-localized with TRAP in osteoclast-resorptive compartments, supporting a role for cathepsin K in the extracellular processing of monomeric TRAP in the resorption lacuna.
Collapse
Affiliation(s)
- Jenny Ljusberg
- Department of Laboratory Medicine, Divisions of Pathology and Clinical Research Centre, Karolinska Institutet, Karolinska University Hospital, S-141 86 Huddinge, Sweden
| | | | | | | | | | | | | | | |
Collapse
|
34
|
Lanznaster M, Neves A, Bortoluzzi AJ, Aires VVE, Szpoganicz B, Terenzi H, Severino PC, Fuller JM, Drew SC, Gahan LR, Hanson GR, Riley MJ, Schenk G. A new heterobinuclear FeIIICuII complex with a single terminal FeIII–O(phenolate) bond. Relevance to purple acid phosphatases and nucleases. J Biol Inorg Chem 2005; 10:319-32. [PMID: 15843985 DOI: 10.1007/s00775-005-0635-7] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2004] [Accepted: 02/17/2005] [Indexed: 10/25/2022]
Abstract
A novel heterobinuclear mixed valence complex [Fe(III)Cu(II)(BPBPMP)(OAc)(2)]ClO(4), 1, with the unsymmetrical N(5)O(2) donor ligand 2-bis[{(2-pyridylmethyl)aminomethyl}-6-{(2-hydroxybenzyl)(2-pyridylmethyl)}aminomethyl]-4-methylphenol (H(2)BPBPMP) has been synthesized and characterized. A combination of data from mass spectrometry, potentiometric titrations, X-ray absorption and electron paramagnetic resonance spectroscopy, as well as kinetics measurements indicates that in ethanol/water solutions an [Fe(III)-(mu)OH-Cu(II)OH(2)](+) species is generated which is the likely catalyst for 2,4-bis(dinitrophenyl)phosphate and DNA hydrolysis. Insofar as the data are consistent with the presence of an Fe(III)-bound hydroxide acting as a nucleophile during catalysis, 1 presents a suitable mimic for the hydrolytic enzyme purple acid phosphatase. Notably, 1 is significantly more reactive than its isostructural homologues with different metal composition (Fe(III)M(II), where M(II) is Zn(II), Mn(II), Ni(II), or Fe(II)). Of particular interest is the observation that cleavage of double-stranded plasmid DNA occurs even at very low concentrations of 1 (2.5 microM), under physiological conditions (optimum pH of 7.0), with a rate enhancement of 2.7 x 10(7) over the uncatalyzed reaction. Thus, 1 is one of the most effective model complexes to date, mimicking the function of nucleases.
Collapse
Affiliation(s)
- Mauricio Lanznaster
- LABINC Laboratório de Bioinorgânica e Cristalografia, Departamento de Química, Universidade Federal de Santa Catarina, Campus Trindade, 88040-900 Florianópolis, SC, Brazil
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Jovito R, Neves A, Bortoluzzi AJ, Lanznaster M, Drago V, Haase W. A new unsymmetrical dinucleating ligand and its first FeIIIZnII complex: Structure and solid state properties of an unexpected tetranuclear complex containing the [FeIII(μ-OH)2FeIII] structural motif. INORG CHEM COMMUN 2005. [DOI: 10.1016/j.inoche.2005.01.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
36
|
Funhoff EG, Bollen M, Averill BA. The Fe(III)Zn(II) form of recombinant human purple acid phosphatase is not activated by proteolysis. J Inorg Biochem 2005; 99:521-9. [PMID: 15621285 DOI: 10.1016/j.jinorgbio.2004.10.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2004] [Revised: 10/21/2004] [Accepted: 10/25/2004] [Indexed: 10/26/2022]
Abstract
The kinetics and spectroscopic properties of the single polypeptide and proteolytically cleaved form of recombinant Fe(3+)Fe(2+) human purple acid phosphatase (recHPAP) exhibit significant differences, primarily due to a difference in pK(es,1) (the value of an acid dissociation constant of the ES complex). These differences are due to the presence or absence, respectively, of an interaction between an aspartate residue in an exposed loop of the protein and one or more active site residues. To further explore the origin of these differences, the ferrous ion of recHPAP has been replaced by zinc. Analysis of the reconstituted Fe(3+)Zn(2+)recHPAP reveals an unexpected catalytic activity versus pH profile, in that the optimal pH is 6.3, similar to that of the proteolytically cleaved form (6.5). Moreover, replacement of the ferrous ion by zinc increases the turnover number more than 10-fold; the pK(es) values are also shifted as expected for the change in the divalent metal ion. Although the EPR spectra of both single polypeptide and proteolytically cleaved Fe(3+)Zn(2+)-recHPAP are independent of pH over the range 4.5-6.2, the visible spectrum of Fe(3+)Zn(2+)-recHPAP is pH dependent. These results suggest that the properties and environment of the divalent metal are important in determining the catalytic properties of mammalian PAPs, and in particular that a solvent molecule coordinated to the divalent metal ion may play a critical role in the catalytic cycle of these enzymes.
Collapse
Affiliation(s)
- Enrico G Funhoff
- SILS, University of Amsterdam, Plantage Muidergracht 12, 1018 TV Amsterdam, The Netherlands
| | | | | |
Collapse
|
37
|
Schenk G, Gahan LR, Carrington LE, Mitic N, Valizadeh M, Hamilton SE, de Jersey J, Guddat LW. Phosphate forms an unusual tripodal complex with the Fe-Mn center of sweet potato purple acid phosphatase. Proc Natl Acad Sci U S A 2004; 102:273-8. [PMID: 15625111 PMCID: PMC544300 DOI: 10.1073/pnas.0407239102] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Purple acid phosphatases (PAPs) are a family of binuclear metalloenzymes that catalyze the hydrolysis of phosphoric acid esters and anhydrides. A PAP in sweet potato has a unique, strongly antiferromagnetically coupled Fe(III)-Mn(II) center and is distinguished from other PAPs by its increased catalytic efficiency for a range of activated and unactivated phosphate esters, its strict requirement for Mn(II), and the presence of a mu-oxo bridge at pH 4.90. This enzyme displays maximum catalytic efficiency (k(cat)/K(m)) at pH 4.5, whereas its catalytic rate constant (k(cat)) is maximal at near-neutral pH, and, in contrast to other PAPs, its catalytic parameters are not dependent on the pK(a) of the leaving group. The crystal structure of the phosphate-bound Fe(III)-Mn(II) PAP has been determined to 2.5-A resolution (final R(free) value of 0.256). Structural comparisons of the active site of sweet potato, red kidney bean, and mammalian PAPs show several amino acid substitutions in the sweet potato enzyme that can account for its increased catalytic efficiency. The phosphate molecule binds in an unusual tripodal mode to the two metal ions, with two of the phosphate oxygen atoms binding to Fe(III) and Mn(II), a third oxygen atom bridging the two metal ions, and the fourth oxygen pointing toward the substrate binding pocket. This binding mode is unique among the known structures in this family but is reminiscent of phosphate binding to urease and of sulfate binding to lambda protein phosphatase. The structure and kinetics support the hypothesis that the bridging oxygen atom initiates hydrolysis.
Collapse
Affiliation(s)
- Gerhard Schenk
- Department of Biochemistry and Molecular Biology, School of Molecular and Microbial Sciences, University of Queensland, Brisbane 4072, Australia.
| | | | | | | | | | | | | | | |
Collapse
|
38
|
Valizadeh M, Schenk G, Nash K, Oddie GW, Guddat LW, Hume DA, de Jersey J, Burke TR, Hamilton S. Phosphotyrosyl peptides and analogues as substrates and inhibitors of purple acid phosphatases. Arch Biochem Biophys 2004; 424:154-62. [PMID: 15047187 DOI: 10.1016/j.abb.2004.01.008] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2003] [Revised: 12/23/2003] [Indexed: 11/15/2022]
Abstract
Purple acid phosphatases are metal-containing hydrolases. While their precise biological role(s) is unknown, the mammalian enzyme has been linked in a variety of biological circumstances (e.g., osteoporosis) with increased bone resorption. Inhibition of the human enzyme is a possible strategy for the treatment of bone-resorptive diseases such as osteoporosis. Previously, we determined the crystal structure of pig purple acid phosphatase to 1.55A and we showed that it is a good model for the human enzyme. Here, a study of the pH dependence of its kinetic parameters showed that the pig enzyme is most efficient at pH values similar to those encountered in the osteoclast resorptive space. Based on the observation that phosphotyrosine-containing peptides are good substrates for pig purple acid phosphatase, peptides containing a range of phosphotyrosine mimetics were synthesized. Kinetic analysis showed that they act as potent inhibitors of mammalian and plant purple acid phosphatases, with the best inhibitors exhibiting low micromolar inhibition constants at pH 3-5. These compounds are thus the most potent organic inhibitors yet reported for the purple acid phosphatases.
Collapse
Affiliation(s)
- Mohsen Valizadeh
- Department of Biochemistry, The University of Queensland, St. Lucia, Qld 4072, Australia
| | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Belle C, Pierre J. Asymmetry in Bridged Binuclear Metalloenzymes: Lessons for the Chemist. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200300231] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Catherine Belle
- LEDSS, Chimie Biomimétique, UMR CNRS 5616, Université J. Fourier, B. P. 53, 38041 Grenoble Cedex, France, Fax: (internat.) +33‐4‐76514836
| | - Jean‐Louis Pierre
- LEDSS, Chimie Biomimétique, UMR CNRS 5616, Université J. Fourier, B. P. 53, 38041 Grenoble Cedex, France, Fax: (internat.) +33‐4‐76514836
| |
Collapse
|
40
|
Westerhausen M, Bollwein T, Karaghiosoff K, Schneiderbauer S, Vogt M, Nöth H. C−N Activation versus Metalation: Reaction of Bis(methylzinc) 1,2-Bis((tert-butyldimethylsilyl)amido)-1,2-dipyridylethane with Acetamide and Aniline. Organometallics 2002. [DOI: 10.1021/om010867l] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthias Westerhausen
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 9 (House D), D-81377 Munich, Germany
| | - Tobias Bollwein
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 9 (House D), D-81377 Munich, Germany
| | - Konstantin Karaghiosoff
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 9 (House D), D-81377 Munich, Germany
| | - Stefan Schneiderbauer
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 9 (House D), D-81377 Munich, Germany
| | - Martin Vogt
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 9 (House D), D-81377 Munich, Germany
| | - Heinrich Nöth
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 9 (House D), D-81377 Munich, Germany
| |
Collapse
|
41
|
Albedyhl S, Averbuch-Pouchot M, Belle C, Krebs B, Pierre J, Saint-Aman E, Torelli S. Dinuclear Zinc(II)−Iron(III) and Iron(II)−Iron(III) Complexes as Models for Purple Acid Phosphatases. Eur J Inorg Chem 2001. [DOI: 10.1002/1099-0682(200106)2001:6<1457::aid-ejic1457>3.0.co;2-f] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
42
|
Zang TM, Hollman DA, Crawford PA, Crowder MW, Makaroff CA. Arabidopsis glyoxalase II contains a zinc/iron binuclear metal center that is essential for substrate binding and catalysis. J Biol Chem 2001; 276:4788-95. [PMID: 11085979 DOI: 10.1074/jbc.m005090200] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Glyoxalase II participates in the cellular detoxification of cytotoxic and mutagenic 2-oxoaldehydes. Because of its role in chemical detoxification, glyoxalase II has been studied as a potential anti-cancer and/or anti-protozoal target; however, very little is known about the active site and reaction mechanism of this important enzyme. To characterize the active site and kinetic mechanism of the enzyme, a detailed mutational study of Arabidopsis glyoxalase II was conducted. Data presented here demonstrate for the first time that the cytoplasmic form of Arabidopsis glyoxalase II contains an iron-zinc binuclear metal center that is essential for activity. Both metals participate in substrate binding, transition state stabilization, and the hydrolysis reaction. Subtle alterations in the geometry and/or electrostatics of the binuclear center have profound effects on the activity of the enzyme. Additional residues important in substrate binding have also been identified. An overall reaction mechanism for glyoxalase II is proposed based on the mutational and kinetic data from this study and crystallographic data on human glyoxalase II. Information presented here provides new insights into the active site and reaction mechanism of glyoxalase II that can be used for the rational design of glyoxalase II inhibitors.
Collapse
Affiliation(s)
- T M Zang
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio 45056, USA
| | | | | | | | | |
Collapse
|