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Patel MN, Chhasatia MR, Patel SH, Bariya HS, Thakkar VR. DNA cleavage, binding and intercalation studies of drug-based oxovanadium(IV) complexes. J Enzyme Inhib Med Chem 2009; 24:715-21. [DOI: 10.1080/14756360802361423] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- M. N. Patel
- Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, 388 120, Gujarat, India
| | - M. R. Chhasatia
- Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, 388 120, Gujarat, India
| | - S. H. Patel
- Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, 388 120, Gujarat, India
| | - H. S. Bariya
- B & R Doshi School of Biosciences, Sardar Patel University, Vallabh Vidyanagar, 388 120, Gujarat, India
| | - V. R. Thakkar
- B & R Doshi School of Biosciences, Sardar Patel University, Vallabh Vidyanagar, 388 120, Gujarat, India
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52
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Hirose E, Ohtake SI, Azumi K. Morphological characterization of the tunic in the edible ascidian, Halocynthia roretzi (Drasche), with remarks on 'soft tunic syndrome' in aquaculture. JOURNAL OF FISH DISEASES 2009; 32:433-445. [PMID: 19364388 DOI: 10.1111/j.1365-2761.2009.01034.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
'Soft tunic syndrome' is a serious problem in the aquaculture of the edible ascidian, Halocynthia roretzi (Drasche), and often leads to mass mortality. Here, we describe the tunic morphology of intact and diseased ascidians to reveal structural differences between them. Morphologically, diseased tunics are not very different from intact tunics, although the former are thinner and softer than the latter. While several types of cells are distributed in the tunic, the cell types and their cytomorphologies were almost identical in both groups. As bacterial/protozoan cells were not found in either intact or diseased tunics, they are not the direct cause of soft tunic syndrome. The most remarkable difference was in the bundles of tunic fibres that compose the tunic matrix; in intact tunics, the thick bundles interlace to form a firm matrix, whereas in soft tunics, the tunic fibres do not form thick bundles. Furthermore, areas of low fibre density were found in diseased tunics. Therefore, soft tunic syndrome probably causes inhibition of bundle formation and degradation of tunic bundles, creating areas of low fibre density, although the causes remain unknown.
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Affiliation(s)
- E Hirose
- Department of Chemistry, Biology and Marine Science, University of the Ryukyus, Nishihara, Okinawa, Japan.
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53
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Chatterjee PB, Bhattacharya K, Kundu N, Choi KY, Clérac R, Chaudhury M. Vanadium-Induced Nucleophilic IPSO Substitutions in a Coordinated Tetrachlorosemiquinone Ring: Formation of the Chloranilate Anion as a Bridging Ligand. Inorg Chem 2009; 48:804-6. [DOI: 10.1021/ic801985g] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pabitra Baran Chatterjee
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Chemistry Education, Kongju National University, Kongju 314-701, South Korea, CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France, and Université de Bordeaux, UPR 8641, Pessac, F-33600, France
| | - Kisholoy Bhattacharya
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Chemistry Education, Kongju National University, Kongju 314-701, South Korea, CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France, and Université de Bordeaux, UPR 8641, Pessac, F-33600, France
| | - Nabanita Kundu
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Chemistry Education, Kongju National University, Kongju 314-701, South Korea, CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France, and Université de Bordeaux, UPR 8641, Pessac, F-33600, France
| | - Ki-Young Choi
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Chemistry Education, Kongju National University, Kongju 314-701, South Korea, CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France, and Université de Bordeaux, UPR 8641, Pessac, F-33600, France
| | - Rodolphe Clérac
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Chemistry Education, Kongju National University, Kongju 314-701, South Korea, CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France, and Université de Bordeaux, UPR 8641, Pessac, F-33600, France
| | - Muktimoy Chaudhury
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India, Department of Chemistry Education, Kongju National University, Kongju 314-701, South Korea, CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France, and Université de Bordeaux, UPR 8641, Pessac, F-33600, France
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54
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Wright S, Raab A, Tabudravu J, Feldmann J, Long P, Battershill C, Dunlap W, Milne B, Jaspars M. Marine Metabolites and Metal Ion Chelation: Intact Recovery and Identification of an Iron(II) Complex in the Extract of the Ascidian Eudistoma gilboviride. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200802060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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55
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Wright S, Raab A, Tabudravu J, Feldmann J, Long P, Battershill C, Dunlap W, Milne B, Jaspars M. Marine Metabolites and Metal Ion Chelation: Intact Recovery and Identification of an Iron(II) Complex in the Extract of the AscidianEudistoma gilboviride. Angew Chem Int Ed Engl 2008; 47:8090-2. [DOI: 10.1002/anie.200802060] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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56
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Cai M, Sugumaran M, Robinson WE. The crosslinking and antimicrobial properties of tunichrome. Comp Biochem Physiol B Biochem Mol Biol 2008; 151:110-7. [DOI: 10.1016/j.cbpb.2008.06.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2008] [Revised: 06/02/2008] [Accepted: 06/07/2008] [Indexed: 10/22/2022]
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57
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58
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Jelikić-Stankov M, Uskoković-Marković S, Holclajtner-Antunović I, Todorović M, Djurdjević P. Compounds of Mo, V and W in biochemistry and their biomedical activity. J Trace Elem Med Biol 2007; 21:8-16. [PMID: 17317520 DOI: 10.1016/j.jtemb.2006.11.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2006] [Accepted: 11/13/2006] [Indexed: 10/23/2022]
Abstract
Molybdenum, vanadium and tungsten compounds are widely applied as analytical reagents for determination of numerous pharmacologically active substances and different biochemical parameters. Recent data from the available literature pointed to a very potent biomedical activity of compounds containing these trace elements. The present paper represents a survey on the structure and chemical properties of these compounds, as well as on their biological activity, mostly based on their interaction with cations of biomolecules, such as phospholipids and proteins. Besides, their potent inhibitory effects on cellular targets, bacterial and viral DNA and RNA polymerases will be discussed, as well. Numerous authors clearly demonstrated the antiviral (especially anti-HIV), anticoagulant and antineoplastic properties of the compounds containing the above trace elements. It has been also shown that these compounds act on some cellular enzymatic systems leading to the normalisation of blood pressure, blood glucose and serum lipid levels. Also, compounds of these trace elements represent potent antiobesity agents and express hepatoprotective and antioxidative stress activity.
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59
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Parsons Z, Leavitt C, Duong T, Groenewold GS, Gresham GL, Van Stipdonk MJ. Generation of Gas-Phase VO2+, VOOH+, and VO2+−Nitrile Complex Ions by Electrospray Ionization and Collision-Induced Dissociation. J Phys Chem A 2006; 110:11627-35. [PMID: 17034156 DOI: 10.1021/jp062769p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cationic metal species normally function as Lewis acids, accepting electron density from bound electron-donating ligands, but they can be induced to function as electron donors relative to dioxygen by careful control of the oxidation state and ligand field. In this study, cationic vanadium(IV) oxohydroxy complexes were induced to function as Lewis bases, as demonstrated by addition of O2 to an undercoordinated metal center. Gas-phase complex ions containing the vanadyl (VO2+), vanadyl hydroxide (VOOH+), or vanadium(V) dioxo (VO2+) cation and nitrile (acetonitrile, propionitrile, butyronitrile, or benzonitrile) ligands were generated by electrospray ionization (ESI) for study by multiple-stage tandem mass spectrometry. The principal species generated by ESI were complexes with the formula [VO(L)n]2+, where L represents the respective nitrile ligands and n=4 and 5. Collision-induced dissociation (CID) of [VO(L)5]2+ eliminated a single nitrile ligand to produce [VO(L)4]2+. Two distinct fragmentation pathways were observed for the subsequent dissociation of [VO(L)4]2+. The first involved the elimination of a second nitrile ligand to generate [VO(L)3]2+, which then added neutral H2O via an association reaction that occurred for all undercoordinated vanadium complexes. The second [UO(L)4]2+ fragmentation pathway led instead to the formation of [VOOH(L)2]+ through collisions with gas-phase H2O and concomitant losses of L and [L+H]+. CID of [VOOH(L)2]+ caused the elimination of a single nitrile ligand to generate [VOOH(L)]+, which rapidly added O2 (in addition to H2O) by a gas-phase association reaction. CID of [VONO3(L)2]+, generated from spray solutions created by mixing VOSO4 and Ba(NO3)2 (and precipitation of BaSO4), caused elimination of NO2 to produce [VO2(L)2]+. CID of [VO2(L)2]+ produced elimination of a single nitrile ligand to form [VO2(L)]+, a V(V) analogue to the O2-reactive V(IV) species [VOOH(L)]+; however, this V(V) complex was unreactive with O2, which indicates the requirement for an unpaired electron in the metal valence shell for O2 addition. In general, the [VO2(L)2]+ species required higher collisions energies to liberate the nitrile ligand, suggesting that they are more strongly bound than the [VOOH(L)2]+ counterparts.
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Affiliation(s)
- Zack Parsons
- Department of Chemistry, Wichita State University, Wichita, Kansas 67260-0051, and Idaho National Laboratory, Idaho Falls, Idaho 83415-2208, USA
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60
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Avecilla F, Geraldes CFGC, Macedo AL, Castro MMCA. Crystal Structure of the VV Dimer [V2O2(μ-O)(dmpp)2(OCH3)2] and Its Equilibrium with the VV Trimer [V3O3(μ-O)3(dmpp)3(H2O)](H2O)2 in Methanol/Water Solutions. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600301] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Fernando Avecilla
- Departamento de Química Fundamental, Universidade daCoruña, Campus de A Zapateira s/n, 15071, A Coruña, Spain
| | - Carlos F. G. C. Geraldes
- Departamento de Bioquímica, Centro de Espectroscopia RMN e Centro de Neurociências e Biologia Celular, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, Apartado 3126, 3001‐401 Coimbra, Portugal
| | - Anjos L. Macedo
- REQUIMTE, C.Q.F.B., Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829‐516 Caparica, Portugal
| | - M. Margarida C. A. Castro
- Departamento de Bioquímica, Centro de Espectroscopia RMN e Centro de Neurociências e Biologia Celular, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, Apartado 3126, 3001‐401 Coimbra, Portugal
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61
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Frank P, DeTomaso A, Hedman B, Hodgson KO. A new structural motif for biological iron: iron K-edge XAS reveals a [Fe4-mu-(OR)5(OR)(9-10)] cluster in the ascidian Perophora annectens. Inorg Chem 2006; 45:3920-31. [PMID: 16676950 DOI: 10.1021/ic051445x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Phlebobranch ascidian Perophora annectens surprisingly exhibited a biological Fe/V ratio of approximately 15:1 on multichannel X-ray fluorescence analysis of two independent collections of organisms. Iron K-edge X-ray absorption spectroscopy (XAS) indicated a single form of iron. The XAS K-edge of the first collection of blood cells was shifted approximately +1 eV relative to that of the second, indicating redox activity with average iron oxidation states of 2.67+ and 2.60+. The first-derivative iron XAS K-edge features at 7120.5, 7124, and 7128 eV resembled the XAS of magnetite but not of ferritin or of dissolved Fe(II) or Fe(III). Pseudo-Voigt fits to blood-cell iron K-edge XAS spectra yielded 12.4 integrated units of preedge intensity, indicating a noncentrosymmetric environment. The non-phase-corrected extended X-ray absorption fine structure (EXAFS) Fourier transform spectrum showed a first-shell O/N peak at 1.55 angstroms and an intense Fe-Fe feature at 2.65 angstroms. Fits to the EXAFS required a split first shell with two O at 1.93 angstroms and three O at 2.07 angstroms, consistent with terminal and bridging alkoxide ligands, respectively. More distant shells included three C at 2.87 angstroms, two Fe at 3.08 angstroms, three O at 3.29 angstroms, and one Fe at 3.8 angstroms. Structural models consistent with these findings include a [Fe4(OR)13](2-/3-) broken-edged Fe4O5 cuboid or a [Fe4(OR)14](3-/4-) "Jacob's ladder" with three edge-fused Fe2(OR)2 rhombs. Either of these models represents an entirely new structural motif for biological iron. Vanadium domination of blood-cell metals cannot be a defining trait of Phlebobranch tunicates so long as P. annectens is included among them.
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Affiliation(s)
- Patrick Frank
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA
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62
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Hsu HF, Su CL, Gopal NO, Wu CC, Chu WC, Tsai YF, Chang YH, Liu YH, Kuo TS, Ke SC. Redox Chemistry in the Reaction of Oxovanadium(V) with Thiolate-Containing Ligands: the Isolation and Characterization of Non-Oxo Vanadium(IV) Complexes Containing Disulfide and Thioether Groups. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200500874] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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63
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Sever MJ, Wilker JJ. Absorption spectroscopy and binding constants for first-row transition metal complexes of a DOPA-containing peptide. Dalton Trans 2006:813-22. [PMID: 16437176 DOI: 10.1039/b509586g] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A diverse array of biological systems incorporate 3,4-dihydroxyphenlyalanine (DOPA) into proteins and small molecules for cross-linking and material generation. Marine worm eggshells, sea squirt wound plugs, and marine mussel adhesives may all be formed by combining DOPA-containing molecules with high levels of metals. In order to provide model systems for characterizing these biomaterials, we carried out a study on metal binding to a DOPA-containing peptide. Ultraviolet-visible absorption spectra are presented for the AdopaTP peptide binding to Fe3+, V3+, VO2+, Mn3+, Ti4+, Cu2+, Co2+, and Ni2+ in mono, bis, and where applicable, tris coordination modes. Association constants were determined for selected metal ions binding to the peptide. In general, the spectroscopic and binding properties of this DOPA-containing peptide were found to be similar to those of catechol.
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Affiliation(s)
- Mary J Sever
- Department of Chemistry, Purdue University, West Lafayette, IN, USA
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64
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Affiliation(s)
- J Andy Tincu
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, 8602 La Jolla Shores Dr., MC 0204, San Diego, La Jolla, CA 92093-0204.
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65
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Saleh MB, Kerr RG. Oxidation of tyrosine diketopiperazine to DOPA diketopiperazine with tyrosine hydroxylase. JOURNAL OF NATURAL PRODUCTS 2004; 67:1390-1391. [PMID: 15332860 DOI: 10.1021/np034083j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The diketopiperazine of DOPA was synthesized in high yield from the diketopiperazine of tyrosine using PC12 cell lysate, which expresses high levels of tyrosine hydroxylase. This represents the first use of this enzyme to prepare DOPA-containing peptides.
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Affiliation(s)
- Maysoon B Saleh
- Department of Chemistry and Biochemistry, Center of Excellence in Biomedical and Marine Biotechnology, Florida Atlantic University, 777 Glades Road, Boca Raton, Florida 33431, USA
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66
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Crans DC, Smee JJ, Gaidamauskas E, Yang L. The chemistry and biochemistry of vanadium and the biological activities exerted by vanadium compounds. Chem Rev 2004; 104:849-902. [PMID: 14871144 DOI: 10.1021/cr020607t] [Citation(s) in RCA: 987] [Impact Index Per Article: 49.4] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Debbie C Crans
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA.
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67
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Rao MR, Faulkner DJ. Botryllamides E-H, four new tyrosine derivatives from the ascidian Botrylloides tyreum. JOURNAL OF NATURAL PRODUCTS 2004; 67:1064-6. [PMID: 15217298 DOI: 10.1021/np0499618] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
A specimen of the ascidian Botrylloides tyreum from Palau contained the known metabolites botryllamides A (5) and C (7) together with four new tyrosine derivatives, botryllamides E-H (1-4), the structures of which were elucidated by interpretation of spectroscopic data. The botryllamides exhibited weak cytotoxicity against the HCT-116 cell line.
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Affiliation(s)
- M Rama Rao
- Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0212, USA.
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68
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Nette G, Scippa S, De Candia A, de Vincentiis M. Cytochemical localisation of vanadium (III) in the blood cells of the ascidian Phallusia fumigata. Comp Biochem Physiol C Toxicol Pharmacol 2004; 137:271-9. [PMID: 15171951 DOI: 10.1016/j.cca.2004.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2004] [Revised: 01/28/2004] [Accepted: 02/04/2004] [Indexed: 10/26/2022]
Abstract
Most recent studies of vanadium in ascidian blood indicate the signet ring cell as the cell type that stores vanadium. However, in Phallusia fumigata the situation is less clear, with contradictory reports. Therefore, the blood cells of the ascidian P. fumigata were stained with the vanadium(III) specific ligand 2,2'-bipyridine. The presence of vanadium was revealed in the vacuolated amoebocyte, the second compartment cell type or pluri-vacuolated cell, as well as the bivacuolated cell and the signet ring cell. Staining was not observed in either the morula cells or the compartment cells, the predominant cell types in the mature animal.
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Affiliation(s)
- Geoffrey Nette
- Dipartimento di Genetic Biologia, Generale E Molecolare, Facolta di Scienze, Università di Napoli, via Mezzacanone 8, I-80134 Naples, Zoological Station 'A. Dohrn', Villa comunale, 80121 Naples, Italy
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69
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Mono and oligonuclear vanadium complexes as catalysts for alkane oxidation: synthesis, molecular structure, and catalytic potential. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2003.05.005] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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70
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Sever MJ, Wilker JJ. Visible absorption spectra of metal–catecholate and metal–tironate complexes. Dalton Trans 2004:1061-72. [PMID: 15252685 DOI: 10.1039/b315811j] [Citation(s) in RCA: 178] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interactions between metals and catechol (1,2-dihydroxybenzene) or other ortho-dihydroxy moieties are being found in an increasing number of biological systems with functions ranging from metal ion internalization to biomaterial synthesis. Although metal-catecholate interactions have been studied in the past, we present the first systematic study of an array of these compounds, all prepared under identical conditions. We report the ultraviolet-visible absorption (UV-vis) spectra for catecholate and tironate complexes of the first row transition elements. Generation and identification of these species were accomplished by preparing aqueous solutions with varied ligand:metal ratios and subsequently titrating with base (NaOH). Controlled ligand deprotonation and metal binding resulted in sequential formation of complexes with one, two, and sometimes three catecholate or tironate ligands bound to a metal ion. We prepared the mono-, bis- and tris-catecholates and -tironates of Fe(3+), V(3+), V(4+)and Mn(3+), the mono- and bis-catecholates and -tironates of Cu(2+), Co(2+), Ni(2+), Zn(2+), Cr(2+) and Mn(2+), and several Ti(4+) and Cr(3+) species. The UV-vis spectra of each complex are described, some of which have not been reported previously. These data can now be applied to characterization of biological metal-catecholate systems.
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Affiliation(s)
- Mary J Sever
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084, USA
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71
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Preparation and characterisation of vanadium complexes derived from salicylaldehyde or pyridoxal and sugar derivatives. Inorganica Chim Acta 2003. [DOI: 10.1016/s0020-1693(03)00395-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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72
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73
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Taylor SW, Kassel DB, Tincu JA, Craig AG. Fragmentation of tunichrome Sp-1 is dominated by an unusual gas-phase intramolecular rearrangement. JOURNAL OF MASS SPECTROMETRY : JMS 2003; 38:1105-1109. [PMID: 14595860 DOI: 10.1002/jms.530] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Tunichrome Sp-1 is a modified pentapeptide from the ascidian Styela plicata, having the structure H-DOPA-DOPA-Gly-Pro-dcDeltaDOPA (where DOPA = 3,4-dihydroxyphenylalanine and dcDeltaDOPA = decarboxy-(E)-alpha,beta-dehydro-DOPA). The tandem mass spectrum of the peptide is dominated by a number of abundant fragment ions that involve a gas-phase rearrangement where the dcDeltaDOPA group becomes covalently attached to the N-terminus. The high degree of rearrangement in Sp-1 compared with a related octapeptide, plicatamide, allowed for detailed multiple mass spectrometric (MS(n)) (up to n = 6) experiments, and hence permitted a detailed assessment of the origin and routes to the formation of the various rearrangement ions. Analyses on both a triple-quadrupole and a quadrupole time-of-flight mass spectrometer were made to ascertain whether the gas-phase rearrangements observed for tunichrome Sp-1 were unique to an ion trap mass spectrometer (i.e. the hypothesis being that perhaps the extended trapping times were required to facilitate this unusual gas-phase rearrangement). Interestingly, analyses on both the triple-quadrupole and quadruple time-of-flight mass spectrometers revealed an identical phenomenon, with the rearrangement fragment ions present at approximately the same abundance as the non-rearranged a-, b- and y-type sequence ions. We suggest that the smaller size of tunichrome Sp-1 compared with plicatamide facilitates the transfer of the dcDeltaDOPA group in this gas-phase rearrangement. This rearrangement was not observed for peptide analogs of tunichrome Sp-1 that did not contain the dcDeltaDOPA at the C-terminus, confirming that the presence of dcDeltaDOPA is critical for the rearrangement.
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Affiliation(s)
- Steven W Taylor
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California-San Diego, La Jolla, CA 92093-0204, USA.
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74
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Rikkou M, Manos M, Tolis E, Sigalas MP, Kabanos TA, Keramidas AD. NMR and theoretical investigations on the structures and dynamics of octahedral bis(chelate)dichloro V(III) compounds isolated by an unusual reduction of non-oxo V(IV) species. Inorg Chem 2003; 42:4640-9. [PMID: 12870955 DOI: 10.1021/ic034221s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reaction of the non-oxo V(IV) species [V(IV)Cl(2)(L(OO))(2)] [L(OO) = acetylacetonate (acac(-)) or benzoylacetonate (bzac(-))] with a chelate nitrogen-donor ligand L(NN) in acetonitrile leads to the reduction of V(IV) to V(III) and the formation of the mononuclear V(III) compounds of the general formula [V(III)Cl(2)(L(OO))(L(NN))] (L(OO) and L(NN) are acac(-) and bipy for 1; acac- and 5,5'-me(2)bipy for 2; acac(-) and 4,4'-tb(2)bipy for 3; acac(-) and phen for 4; bzac(-) and bipy for 5; bzac(-) and phen for 6). The reduction of the V(IV) complexes was monitored by GC-MS and (1)H NMR spectroscopy. Both one- and two-dimensional (2D COSY and 2D EXSY) (1)H NMR techniques were used to assign the observed (1)H NMR resonances of 1-6 in CD(2)Cl(2) or CDCl(3) solution. It appeared that in solution these V(III) complexes form two isomers which are in equilibrium: cis-[V(III)Cl(2)(L(OO))(L(NN))] <==> trans-[V(III)Cl(2)(L(OO))(L(NN))]. 2D EXSY cross-peaks were clearly observed between bipy- and acac-hydrogen atoms of the two geometrical isomers of 1-3 as well as between bipy and acac(-) protons of the cis isomer, indicating a dynamic process that corresponds to cis-trans isomerization and a cis-cis racemization. The thermodynamic and kinetic parameters of the equilibrium between these two isomers were calculated for compounds 1 and 2 by using variable temperature (VT) NMR data. Both cis-trans isomerization and cis-cis racemization processes probably proceed with an intramolecular twist mechanism involving a trigonal prismatic transition state. Density functional calculations (DFT) also indicated such a rearrangement mechanism.
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Affiliation(s)
- Maria Rikkou
- Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus
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75
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Abstract
Hydroxylation of peptidyl-3,4-dihydroxyphenyl-l-alanine (Dopa) was observed during tyrosinase incubation of a decapeptide related to the mussel adhesive protein mefp1. The reaction was carried out at high enzyme concentrations (700 units tyrosinase/micromol of tyrosine). The hydroxylation of tyrosines in the decapeptide proceeds sequentially. First, Tyr-9 is hydroxylated to Dopa, followed by hydroxylation of Tyr-5; finally, Dopa-9 is hydroxylated to Topa. Topa was identified as 3,4,5-trihydroxyphenylalanine (3,4,5-Topa) by comparison to known standards using amino acid analysis, derivatization with phenylisothiocyanate in combination with Edman sequencing, and matrix-assisted laser desorption mass spectrometry with time-of-flight. Two other peptides, not related to mussel proteins, were also found to form peptidyl-Topa upon incubation with tyrosinase. Although 3,4,5-Topa has been reported in the primary sequence of several peptides, its formation in vitro from tyrosine-containing peptides is novel. The formation of Topa would appear to be a function of tyrosinase rather than the nucleophilic addition of water to dopaquinone.
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Affiliation(s)
- Luis A Burzio
- Surgical Sealants, Inc., Woburn, Massachusetts 01801, USA
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77
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Bhattacharyya S, Mukhopadhyay S, Samanta S, Weakley TJR, Chaudhury M. Synthesis, characterization, and reactivity of mononuclear O,N-chelated vanadium(IV) and -(III) complexes of methyl 2-Aminocyclopent-1-ene-1-dithiocarboxylate based ligand: reporting an example of conformational isomerism in the solid state. Inorg Chem 2002; 41:2433-40. [PMID: 11978110 DOI: 10.1021/ic0108639] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Vanadium(IV) and -(III) complexes of a tetradentate N(2)OS Schiff base ligand H(2)L [derived from methyl 2-((beta-aminoethyl)amino)cyclopent-1-ene-1-dithiocarboxylate and salicylaldehyde] are reported. In all the complexes, the ligand acts in a bidentate (N,O) fashion leaving a part containing the N,S donor set uncoordinated. The oxovanadium(IV) complex [VO(HL)(2)] (1) is obtained by the reaction between [VO(acac)(2)] and H(2)L. In the solid state, compound 1 has two conformational isomers 1a and 1b; both have been characterized by X-ray crystallography. Compound 1a has the syn conformation that enforces the donor atoms around the metal center to adopt a distorted tbp structure (tau = 0.55). Isomer 1b on the other hand has an anti conformation with almost a regular square pyramidal geometry (tau = 0.06) around vanadium. In solution, however, 1 prefers to be in the square pyramidal form. A second variety of vanadyl complex [VO(L(cyclic))(2)](I(3))(2) (2) with a new bidentate O,N donor ligand involving isothiazolium moiety has been obtained by a ligand-based oxidation of the precursor complex 1 with iodine. Preliminary X-ray and FAB mass spectroscopic data of 2 have supported the formation of a heterocyclic moiety by a ring closure reaction involving a N-S bond. Vanadium(III) complex [V(acac)(HL)(2)] (3) has been obtained through partial ligand displacement of [V(acac)(3)] with H(2)L. Compound 3 has almost a regular octahedral structure completed by two bidentate HL ligands along with an acetylacetonate molecule. Electronic spectra, magnetism, EPR, and redox properties of these compounds are reported.
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Affiliation(s)
- Sudeep Bhattacharyya
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India
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78
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Tincu JA, Taylor SW. Tunichrome sp-1: new pentapeptide tunichrome from the hemocytes of Styela plicata. JOURNAL OF NATURAL PRODUCTS 2002; 65:377-378. [PMID: 11908983 DOI: 10.1021/np010352z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A modified pentapeptide has been isolated from the hemocytes of the ascidian Styela plicata. The structure of the peptide was determined by Edman sequence analysis, mass spectrometry, and NMR spectroscopy with the stereochemistry assigned by acid hydrolysis followed by both (a) GC-MS of the volatile amino acid derivatives on a chiral column and (b) ultrasensitive detection of fluorescent diasteromeric derivatives of the component amino acids after reversed-phase HPLC. The peptide L-DOPA-L-DOPA-Gly-L-Pro-dcdeltaDOPA (where DOPA = 3,4-dihydroxyphenylalanine and dcdeltaDOPA = decarboxy-(E)-alpha,beta-dehydro-3,4-dihydroxyphenylalanine) we designate as tunichrome Sp-1.
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Affiliation(s)
- J Andy Tincu
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0204, USA
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79
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Taylor SW. Chemoenzymatic synthesis of peptidyl 3,4-dihydroxyphenylalanine for structure-activity relationships in marine invertebrate polypeptides. Anal Biochem 2002; 302:70-4. [PMID: 11846377 DOI: 10.1006/abio.2001.5522] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An improved method for hydroxylating tyrosine-containing sequences in polypeptides to peptidyl 3,4-dihydroxyphenylalanine (DOPA) using mushroom tyrosinase at relatively high enzyme-to-substrate ratios is described. The new method involves incorporating borate into the reaction mixture to stop formation of the unwanted side product 3,4,5-trihydroxyphenylalanine. Using this method, a model for the palindromic central sequence for the antimicrobial peptide family, the styelins, Y*Y*KHKY*Y* (where Y* is DOPA), was successfully synthesized in high yield from YYKHKYY. This sequence represents a particularly challenging target because of the cluster of four precursor tyrosine residues are in close proximity. The method should be readily applied to larger polypeptides produced by either solid-phase synthesis or recombinant techniques and give greater insight into the roles of this unusual posttranslational modification in marine invertebrates such as mussels and ascidians.
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Affiliation(s)
- Steven W Taylor
- Center for Marine Biotechnology and Biomedicine, University of California, San Diego, La Jolla, California, 92093-0204, USA.
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80
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Maurya MR, Khurana S, Zhang W, Rehder D. Biomimetic oxo-, dioxo- and oxo-peroxo-hydrazonato-vanadium(iv/v) complexes. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b202852m] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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81
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Costa Pessoa J, Correia I, Kiss T, Jakusch T, Castro MMCA, Geraldes CFGC. Oxovanadium(iv and v) and copper(ii) complexes of N-salicyl-glycylglycine and N-salicyl-glycylglycylglycine. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b206835b] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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82
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Frank P, Robinson WE, Kustin K, Hodgson KO. Unprecedented forms of vanadium observed within the blood cells of Phallusia nigra using K-edge X-ray absorption spectroscopy. J Inorg Biochem 2001; 86:635-48. [PMID: 11583781 DOI: 10.1016/s0162-0134(01)00231-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Fits to the vanadium K-edge X-ray absorption spectra (XAS) of five whole blood cell samples from the tunicate Phallusia nigra revealed unprecedented forms of intracellular vanadium. Endogenous vanadium was divided between the V(III) ion (74.2+/-5.1% of total V) and the vanadyl ion [V(IV)=O](2+) (25.2+/-5.4% of total V). The V(III) fraction included both [V(H(2)O)(6)](3+) (36.7+/-5.5%) modeled as VCl(3) in 1 M HCl, and three previously unprecedented chelated V(III) forms (37.5+/-4.6%). Two of these could be represented by the model ligand environments V(acetylacetonate)(3) (17.9+/-3.2%) and K(3)V(catecholate)(3) (13.1+/-4.7%), implying DOPA-like complexation. The third chelated form was represented by the 7-coordinate N(2)O(5) complex Na[V(edta)(H(2)O)] (8.0+/-1.8%). This coordination array, suggestive of a novel mononuclear V(III) protein site, contributed only to fits to samples 1, 2, 3 and 5, which were prepared in the presence of DTT. Endogenous V(IV) (25.2+/-5.4%) was principally modeled as VOCl(2) in 1 M HCl. EPR spectra (averages: A(parallel)=(1.842+/-0.006)x10(-2) cm(-1); A( perpendicular)=(0.718+/-0.007)x10(-2) cm(-1); g(parallel)=1.936+/-0.002; g( perpendicular)=1.990+/-0.001) confirmed the predominance of the aquated vanadyl ion. Blood cell sample five uniquely required the XAS spectrum of VOSO(4) in 0.1 M H(2)SO(4) solution (13.0%) and of [OV(V)(pivalate)(3)] (3.1%) to successfully fit the XAS pre-edge energy region. This endogenous V(V) signal is also unprecedented. These results are compared with those of analogous fits to the blood cells of Ascidia ceratodes and may support assignment of P. nigra to a different genus.
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Affiliation(s)
- P Frank
- Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Stanford, CA 94309, USA
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83
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Wang D, Ebel M, Schulzke C, Grüning C, Hazari S, Rehder D. Vanadium(IV and V) Complexes ContainingSNO (Dithiocarbonylhydrazone; Thiosemicarbazone) Donor Sets. Eur J Inorg Chem 2001. [DOI: 10.1002/1099-0682(200104)2001:4<935::aid-ejic935>3.0.co;2-j] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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84
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Frank P, Hodgson KO. Defining chemical species in complex environments using K-edge X-ray absorption spectroscopy: vanadium in intact blood cells and Henze solution from the tunicate Ascidia ceratodes. Inorg Chem 2000; 39:6018-27. [PMID: 11151502 DOI: 10.1021/ic000546m] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A K-edge X-ray absorption spectrum (XAS) fitting approach has been developed to speciate elements of interest in complex materials and used here to model the storage of biological vanadium within whole blood cells from the tunicate Ascidia ceratodes. The response of the K-edge XAS of solution-phase V(III) to increasing c(sulfate) at constant pH 1.8 produced specific and systematic effects in the preedge transition at 5468.8 eV (preedge transitions: 1s-->4A2 at 5464.9 +/- 0.1 eV, 1s-->4T2 at 5466.9 +/- 0.1 eV, and 1s-->4T1 at 5468.8 +/- 0.1 eV for 11 different V(III)/sulfate solutions). In contrast, variations in acidity (as pH) at constant c(sulfate) systematically modified the V(III) preedge XAS at 5466.9 eV. The energy position of the K-edge absorption maximum also serially shifted -0.32 eV/pH unit, from 5483.7 eV (pH 3.0) to 5484.7 eV (pH 0.3). Fits to the V-K XAS of two samples of A. ceratodes whole blood cells representing dozens of animals implied storage of V(III) ions in four predominant solution regimes: approximately 10% high sulfate/pH 0 acid; approximately 40% high sulfate/pH 1.8 acid; approximately 40% moderate sulfate/pH 1.8 acid; approximately 10% moderate sulfate/pH 3 acid. For lysed blood cells, the best fit represented 63% of the V(III) in a pH 1.6 sulfate-free environment and a further 16% in acidic sulfate solution. Nearly 18% of lysed cells vanadium(III) appeared in a tris(catecholate)-like environment. A detailed speciation of biological vanadium complex ions was calculated from these fits by application of the known equilibrium constants governing V(III) and sulfate in acidic aqueous solution. The utility of blood cell V(III) to ascidians is discussed. Fits to K-edge XAS spectra using the XAS spectra of appropriate models are suggested to be generally applicable to elucidating the state of metal ions in a wide variety of complex environments.
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Affiliation(s)
- P Frank
- Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Stanford, California 94309, USA
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85
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Vlahos AT, Tolis EI, Raptopoulou CP, Tsohos A, Sigalas MP, Terzis A, Kabanos TA. Model investigations of vanadium-protein interactions: novel vanadium(III) and oxovanadium(IV) compounds with the diamidate ligand 1,2-bis(2-pyridinecarboxamide)benzene (H2bpb). Inorg Chem 2000; 39:2977-85. [PMID: 11196892 DOI: 10.1021/ic990837z] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Novel vanadium(III) and oxovanadium(IV) compounds with the diamidate ligand 1,2-bis(2-pyridinecarboxamide)benzene (H2bpb) were synthesized and structurally characterized. H2bpb is capable of binding to vanadium in either its anionic (dianionic-monoanionic) or its neutral form, resulting in complexes of various geometries and stoichiometries. The dianionic form (bpb2-), in NHEt3(trans-[VCl2(bpb)]) (1) and [VO(bpb)(H2O)]05dmso036CH3OH013H2O (6x05dmsox036CH3OHx013H2O), acts as a planar tetradentate bis[N-amidate-N-pyridine] equatorial ligand. The monoanionic form (Hbpb-) behaves as an (Npy,Oam) or (Npy,Nam) chelator in [V(Hbpb)3]2CHCl3 (22CHCl3) as well as a mu 2-bridging-eta 4-(Npy,Oam-Npy,Nam) in [VOCl(Hbpb)](2)x2CH3NO2 (3x2CH3NO2), while the neutral H2bpb behaves as a mu 2-bridging-eta 4-bis(Npy,Oam) in [VOCl(H2bpb)](2)x104CH3OHx123thfx074H2O (4x104CH3OH123thf074H2O). Compound 4x104CH3OHx123thfx074H2O crystallizes in the triclinic system P1, with (at 25 degrees C) a = 9140(2) A, b = 11058(2) A, c = 14175(2) A, alpha = 99013(5) degrees, beta = 104728(7) degrees, gamma = 102992(7) degrees, V = 13149(4) A3, Z = 1, while compound 605dmso036CH3OH013H2O crystallizes in the monoclinic space group P2(1)/n with (at 25 degrees C) a = 11054(5) A, b = 11407(5) A, c = 16964(7) A, beta = 932(1) degrees, V = 2136(2) A3, Z = 4. Variable temperature magnetic susceptibility studies of the dimeric compounds 3x2CH3NO2 and 4x104CH3OH show g values for the V(IV) centers that are slightly smaller than 20 (as expected for d1 ions) and indicate small antiferromagnetic coupling between the two vanadium(IV) centers. Ab initio calculations were also carried out, providing results concerning the effect of the relative strength and the deformation energy involved in the eta 2-(Npy,Nam) and eta 2-(Npy,Oam) bonding modes in the ligation of Hbpb- to vanadium.
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Affiliation(s)
- A T Vlahos
- Department of Chemistry, Section of Inorganic and Analytical Chemistry, University of Ioannina, 451 10 Ioannina, Greece
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86
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Abstract
One-electron reduction and oxidation induced by vanadium complexes are demonstrated to be useful in oxidative and reductive transformations of carbonyl compounds. The redox interaction between vanadium complexes and redox-active ligands is achieved with coenzyme PQQ and polyanilines that afford the corresponding redox systems.
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Affiliation(s)
- T Hirao
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Japan
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87
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Tincu JA, Craig AG, Taylor SW. Plicatamide: A lead to the biosynthetic origins of the tunichromes? Biochem Biophys Res Commun 2000; 270:421-4. [PMID: 10753640 DOI: 10.1006/bbrc.2000.2449] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Plicatamide is a modified octapeptide from the ascidian Styela plicata having the structure Phe-Phe-His-Leu-His-Phe-His-decarboxyDeltaDOPA (where decarboxyDeltaDOPA = decarboxy-(E)-alpha,beta-dehydro-3, 4-dihydroxyphenylalanine). Edman sequencing, tandem mass spectrometry, and proton NMR have been used to characterize 100 microg of the compound. Plicatamide represents an important link between two classes of biomolecules: the tunichromes which share an oxidatively decarboxylated C-terminus and higher molecular weight DOPA-polypeptides. The 8-residue sequence provides the first opportunity to investigate the biosynthetic origins of the tunichrome family by molecular biological techniques.
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Affiliation(s)
- J A Tincu
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0204, USA
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88
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Bowden BF. Aromatic alkaloids from ascidians. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1572-5995(00)80131-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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89
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90
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Frank P, Hedman B, Hodgson KO. Sulfur Allocation and Vanadium−Sulfate Interactions in Whole Blood Cells from the Tunicate Ascidia ceratodes, Investigated Using X-ray Absorption Spectroscopy. Inorg Chem 1998. [DOI: 10.1021/ic980792m] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Patrick Frank
- Department of Chemistry, Stanford University, Stanford, California 94305, and Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Stanford, California 94309
| | - Britt Hedman
- Department of Chemistry, Stanford University, Stanford, California 94305, and Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Stanford, California 94309
| | - Keith O. Hodgson
- Department of Chemistry, Stanford University, Stanford, California 94305, and Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Stanford, California 94309
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91
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Frank P, Hodgson KO, Kustin K, Robinson WE. Vanadium K-edge x-ray absorption spectroscopy reveals species differences within the same ascidian genera. A comparison of whole blood from Ascidia nigra and Ascidia ceratodes. J Biol Chem 1998; 273:24498-503. [PMID: 9733743 DOI: 10.1074/jbc.273.38.24498] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Vanadium K-edge x-ray absorption spectroscopy (XAS) was used to examine whole blood preparations from the tunicates Ascidia nigra and Ascidia ceratodes. Each XAS spectrum exhibits a rising edge inflection near 5480 eV characteristic of vanadium(III) and an intensity maximum at 5484.0 eV. In A. ceratodes blood cells, intrinsic aquo-VSO4+ complex ion is indicated by an inflection feature at 5476 eV in the first derivative of the vanadium K-edge XAS spectrum, but this feature is notably absent from the first derivative of the vanadium K-edge spectrum of blood cells from A. nigra. A strong pre-edge feature at 5468.6 eV also uniquely distinguishes the vanadium K-edge XAS spectrum of A. nigra blood cells, implying that vanadyl ion represents approximately 25% of the endogenous vanadium. However, the energy position of the rising edge inflection of the vanadium K-edge XAS spectrum of A. nigra (5479.5 eV) is 1 eV lower than that of A. ceratodes (5480.5 eV), the reverse of any expected shift arising from the endogenous vanadyl ion. Thus, in contrast to A. ceratodes, a significant fraction of the blood cell vanadium(III) in A. nigra is apparently in a ligation environment substantially different from that provided by water. These novel species-related differences may have taxonomic significance.
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Affiliation(s)
- P Frank
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA
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92
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Wipf P. Synthesis and Structure-Activity Studies of Lissoclinum Peptide Alkaloids. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0735-8210(98)80005-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
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93
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Taylor SW, Kammerer B, Nicholson GJ, Pusecker K, Walk T, Bayer E, Scippa S, de Vincentiis M. Morulin Pm: a modified polypeptide containing TOPA and 6-bromotryptophan from the morula cells of the ascidian, Phallusia mammillata. Arch Biochem Biophys 1997; 348:278-88. [PMID: 9434739 DOI: 10.1006/abbi.1997.0371] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A novel polypeptide containing the unusual posttranslationally modified amino acids L-3,4,5-trihydroxyphenylalanine (TOPA) and L-6-bromotryptophan (6-BrW) has been isolated from the morula cells of the vanadium-accumulating ascidian, Phallusia mammillata. The polypeptide, designated Morulin Pm, has a molecular weight of 3825 +/- 0.6 and has a simple amino acid composition consisting mainly of TOPA and 6-BrW as well as Ser, Leu, Phe, and Ala. To our knowledge, this is the first reported example of multiple sites of brominated tryptophan in a polypeptide of this size. Edman degradation revealed the N-terminal sequence to be BrW-Leu-Phe-BrW before sequencing was blocked. While the N-terminal tripeptide could be isolated from chymotrypsin digests of Morulin Pm, the rest of the polypeptide resisted further cleavage by the proteases, a feature common among this class of peptides. However, unlike other ascidian blood cell peptides examined to date, microheterogeneity was minimal. For the first time a detailed NMR investigation could be undertaken on a member of this class of polypeptides. In addition to signals assignable to the constituent amino acids by extensive 2D experiments, resonances were present both in the 13C and 1H spectra not typical of a simple linear peptide. Two proton resonances were identified with a cross peak in the correlation spectrum strongly indicative of a C-terminal decarboxy-delta 2,3-unsaturated TOPA residue as observed in certain tunichromes and clionamide. Chemical degradation experiments were undertaken in an effort to produce identifiable fragments to which these signals could be assigned, including full and partial acid hydrolysis and tryptophan-targeted BNPS-skatole treatment. However, the nature of the modification remains unknown. Possible structures for the modification, which may represent the source of the difficulties encountered in the structural elucidation of this and related peptides, are assessed. Conjecture is made as to the biological relevance of Morulin Pm, based on its localization and chemical characteristics.
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Affiliation(s)
- S W Taylor
- Institut für Organische Chemie, Universität Tübingen, Germany
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94
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Henkel B, Zhang L, Bayer E. Investigations on Solid-Phase Peptide Synthesis in N-to-C Direction (Inverse Synthesis). ACTA ACUST UNITED AC 1997. [DOI: 10.1002/jlac.199719971019] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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