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Sokolová M, Šestáková H, Truksa M, Šafařík M, Hadravová R, Bouř P, Šebestík J. Photochemical synthesis of pink silver and its use for monitoring peptide nitration via surface enhanced Raman spectroscopy (SERS). Amino Acids 2022; 54:1261-1274. [PMID: 35731286 DOI: 10.1007/s00726-022-03178-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 05/31/2022] [Indexed: 12/01/2022]
Abstract
Oxidative stress may cause extended tyrosine posttranslational modifications of peptides and proteins. The 3-nitro-L-tyrosine (Nit), which is typically formed, affects protein behavior during neurodegenerative processes, such as Alzheimer's and Parkinson's diseases. Such metabolic products may be conveniently detected at very low concentrations by surface enhanced Raman spectroscopy (SERS). Previously, we have explored the SERS detection of the Nit NO2 bending vibrational bands in a presence of hydrogen chloride (Niederhafner et al., Amino Acids 53:517-532, 2021, ibid). In this article, we describe performance of a new SERS substrate, "pink silver", synthesized photochemically. It provides SERS even without the HCl induction, and the acid further decreases the detection limit about 9 times. Strong SERS bands were observed in the asymmetric (1550-1475 cm-1) and symmetric (1360-1290 cm-1) NO stretching in the NO2 group. The bending vibration was relatively weak, but appeared stronger when HCl was added. The band assignments were supported by density functional theory modeling.
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Affiliation(s)
- Marina Sokolová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Hana Šestáková
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Martin Truksa
- Mensa Gymnázium O.P.S., Španielova 1111/19, 163 00, Prague 6, Czech Republic
| | - Martin Šafařík
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Romana Hadravová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Petr Bouř
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic
| | - Jaroslav Šebestík
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 16610, Prague 6, Czech Republic. .,Mensa Gymnázium O.P.S., Španielova 1111/19, 163 00, Prague 6, Czech Republic.
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Mannino MH, Patel RS, Eccardt AM, Perez Magnelli RA, Robinson CLC, Janowiak BE, Warren DE, Fisher JS. Myoglobin as a versatile peroxidase: Implications for a more important role for vertebrate striated muscle in antioxidant defense. Comp Biochem Physiol B Biochem Mol Biol 2019; 234:9-17. [PMID: 31051268 DOI: 10.1016/j.cbpb.2019.04.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 03/29/2019] [Accepted: 04/23/2019] [Indexed: 12/17/2022]
Abstract
Myoglobins (Mb) are ubiquitous proteins found in striated muscle of nearly all vertebrate taxa. Although their function is most commonly associated with facilitating oxygen storage and diffusion, Mb has also been implicated in cellular antioxidant defense. The oxidized (Fe3+) form of Mb (metMB) can react with hydrogen peroxide (H2O2) to produce ferrylMb. FerrylMb can be reduced back to metMb for another round of reaction with H2O2. In the present study, we have shown that horse skeletal muscle Mb displays peroxidase activity using 2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid (ABTS) and 3,3',5,5'-tetramethylbenzidine (TMB) as reducing substrates, as well as the biologically-relevant substrates NADH/NADPH, ascorbate, caffeic acid, and resveratrol. We have also shown that ferrylMb can be reduced by both ethanol and acetaldehyde, which are known to accumulate in some vertebrate tissues under anaerobic conditions, such as anoxic goldfish and crucian carp, implying a potential mechanism for ethanol detoxification in striated muscle. We found that metMb peroxidase activity is pH-dependent, increasing as pH decreases from 7.4 to 6.1, which is biologically relevant to anaerobic vertebrate muscle when incurring intracellular lactic acidosis. Finally, we found that metMb reacts with hypochlorite in a heme-dependent fashion, indicating that Mb could play a role in hypochlorite detoxification. Taken together, these data suggest that Mb peroxidase activity might be an important antioxidant mechanism in vertebrate cardiac and skeletal muscle under a variety of physiological conditions, such as those that might occur in contracting skeletal muscle or during hypoxia.
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Genetic Code Expansion: A Powerful Tool for Understanding the Physiological Consequences of Oxidative Stress Protein Modifications. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:7607463. [PMID: 29849913 PMCID: PMC5937447 DOI: 10.1155/2018/7607463] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Accepted: 03/19/2018] [Indexed: 12/17/2022]
Abstract
Posttranslational modifications resulting from oxidation of proteins (Ox-PTMs) are present intracellularly under conditions of oxidative stress as well as basal conditions. In the past, these modifications were thought to be generic protein damage, but it has become increasingly clear that Ox-PTMs can have specific physiological effects. It is an arduous task to distinguish between the two cases, as multiple Ox-PTMs occur simultaneously on the same protein, convoluting analysis. Genetic code expansion (GCE) has emerged as a powerful tool to overcome this challenge as it allows for the site-specific incorporation of an Ox-PTM into translated protein. The resulting homogeneously modified protein products can then be rigorously characterized for the effects of individual Ox-PTMs. We outline the strengths and weaknesses of GCE as they relate to the field of oxidative stress and Ox-PTMs. An overview of the Ox-PTMs that have been genetically encoded and applications of GCE to the study of Ox-PTMs, including antibody validation and therapeutic development, is described.
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Protein nitrotryptophan: formation, significance and identification. J Proteomics 2011; 74:2300-12. [PMID: 21679780 DOI: 10.1016/j.jprot.2011.05.032] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 05/17/2011] [Accepted: 05/23/2011] [Indexed: 12/31/2022]
Abstract
Reactive nitrogen species are formed during a variety of disease states and have been shown to modify several amino acids on proteins. To date, the majority of research in this area has focused on the nitration of tyrosine residues to form 3-nitrotyrosine. However, emerging evidence suggests that another modification, nitration of tryptophan residues, to form nitrotryptophan (NO(2)-Trp), may also play a significant role in the biology of nitrosative stress. This review takes an in-depth look at NO(2)-Trp, presenting the current research about its formation, prevalence and biological significance, as well as the methods used to identify NO(2)-Trp-modified proteins. Although more research is needed to understand the full biological role of NO(2)-Trp, the data presented herein suggest a contribution to nitrosative stress-induced cell dysregulation and perhaps even in physiological cell processes.
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BRESLOW ESTHER, LABORDE THIRLEEN, SAAYMAN HESTAS, OELOFSEN WILLEM, NAUDÉ RYNOJ. Binding and spectroscopic properties of ostrich neurophysins. ACTA ACUST UNITED AC 2009. [DOI: 10.1111/j.1399-3011.1992.tb01599.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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ABERCROMBIE DAVIDM, KANMERA TATSUHIKO, ANGAL SAROJANI, TAMAOKI HIDETSUNE, CHAIKEN IRWINM. Cooperative interactions in neurophysin-neuropeptide hormonecomplexes. ACTA ACUST UNITED AC 2009. [DOI: 10.1111/j.1399-3011.1984.tb00950.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kirschenbaum DM. Molar absorptivity and A-1 -1cm values for proteins at selected wavelengths of the ultraviolet and visible region. I. INTERNATIONAL JOURNAL OF PROTEIN RESEARCH 2009; 3:109-15. [PMID: 5165566 DOI: 10.1111/j.1399-3011.1971.tb01700.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Breslow E, Burman S. Molecular, thermodynamic, and biological aspects of recognition and function in neurophysin-hormone systems: a model system for the analysis of protein-peptide interactions. ADVANCES IN ENZYMOLOGY AND RELATED AREAS OF MOLECULAR BIOLOGY 2006; 63:1-67. [PMID: 2407063 DOI: 10.1002/9780470123096.ch1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- E Breslow
- Department of Biochemistry, Cornell University Medical College, New York, New York
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Breslow E. The neurophysins. ADVANCES IN ENZYMOLOGY AND RELATED AREAS OF MOLECULAR BIOLOGY 2006; 40:271-333. [PMID: 4599939 DOI: 10.1002/9780470122853.ch7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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10
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Ruvo M, Fassina G. End-group modified retro-inverso isomers of tripeptide oxytocin analogues: binding to neurophysin II and enhancement of its self-association properties. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1995; 45:356-65. [PMID: 7601609 DOI: 10.1111/j.1399-3011.1995.tb01049.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The importance of peptide backbone structure in peptide/protein recognition events has been tested evaluating the binding properties of end-group modified retro-inverso isomers of MYF and LYF amides, tripeptides able to mimic oxytocin in binding neurophysin II and in potentiating its self-association. The isomers, topochemically related to their parent peptides, have been prepared respectively from all-D N-acetyl-FYM and N-acetyl-FYL amides via the Hofmann-type rearrangement mediated by iodobenzene bis-trifluoroacetate. Retro-inverso isomers recognised neurophysin II with similar affinity as the parent peptides, as determined by analytical affinity chromatography on columns prepared immobilising neurophysin II on preactivated supports. In addition, their effect on neurophysin II self-association was similar to the tripeptide oxytocin analogues, potentiating neurophysin II dimerization to the same extent, as evaluated by solid-phase binding assays on microtiter plates coated with neurophysin II. Recognition specificity of retro-inverso isomers was further demonstrated by their inhibitory effect on the interaction between neurophysin II and oxytocin tripeptide analogues. Results suggest that only the proper orientation of the alpha-amino group and of the side chains plays a dominant role in the binding of tripeptide analogues to neurophysin II and potentiation of its self-association, while the peptide backbone topology has little influence on the recognition process.
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Affiliation(s)
- M Ruvo
- Protein Engineering, TECNOGEN S.c.p.A., Parco Scientifico, Piana di Monte Verna (CE), Italy
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Chen LQ, Rose JP, Breslow E, Yang D, Chang WR, Furey WF, Sax M, Wang BC. Crystal structure of a bovine neurophysin II dipeptide complex at 2.8 A determined from the single-wavelength anomalous scattering signal of an incorporated iodine atom. Proc Natl Acad Sci U S A 1991; 88:4240-4. [PMID: 2034668 PMCID: PMC51634 DOI: 10.1073/pnas.88.10.4240] [Citation(s) in RCA: 106] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The crystal structure of a dipeptide complex of bovine neurophysin II has been solved at 2.8 A resolution solely by using single-wavelength anomalous scattering data from a single iodinated derivative. The asymmetric unit is an elongated tetramer of dimensions 110 x 40 x 30 A, composed of two dimers related by pseudo twofold symmetry. Each monomer consists of two homologous layers, each with four antiparallel beta-strands. The two regions are connected by a helix followed by a long loop. Monomer-monomer contacts involve antiparallel beta-sheet interactions, which form a dimer with two layers of eight beta-strands. One peptide per monomer occupies the principal hormone-binding pocket formed by part of the amino-terminal region and parts of the connecting helix and loop, with binding to protein consistent with conclusions drawn from solution studies. Dimer-dimer contacts involve the Tyr49 region adjacent to this site. A fifth dipeptide, of unknown biological significance, helps to stabilize one of the monomer-monomer interfaces and the tetramer-tetramer network in the crystal.
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Affiliation(s)
- L Q Chen
- Department of Crystallography, University of Pittsburgh, PA 15260
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Burman S, Wellner D, Chait B, Chaudhary T, Breslow E. Complete assignment of neurophysin disulfides indicates pairing in two separate domains. Proc Natl Acad Sci U S A 1989; 86:429-33. [PMID: 2911588 PMCID: PMC286483 DOI: 10.1073/pnas.86.2.429] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The pairing of the 14 half-cystine residues of bovine neurophysin was established by sequential proteolytic digestion. Purified released peptides and the residual disulfide-linked core were monitored at each step by use of amino acid analysis, gas-phase sequencing, and mass spectrometry. The approach included application of gas-phase sequencing to assign disulfide pairs in peptides containing multiple disulfides. The results demonstrate that neurophysin disulfides are paired in two distinct domains--an NH2 domain (residues 10-54) containing four disulfides and a COOH domain (residues 61-85) containing three disulfides. The specific disulfide bridges are Cys-10 to Cys-54, Cys-13 to Cys-27, Cys-21 to Cys-44, Cys-28 to Cys-34, Cys-61 to Cys-73, Cys-74 to Cys-79, and Cys-67 to Cys-85. The results place the internally duplicated segments of neurophysin (residues 12-31 and 60-77) in separate domains. Disulfide-pairing patterns within each domain are homologous with the exception of the Cys-10 to Cys-54 bond, which is unique to the NH2 domain and which links the two ends of this domain together. The potential role of the Cys-10 to Cys-54 bond in organizing the hormone-binding site is discussed.
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Affiliation(s)
- S Burman
- Department of Biochemistry, Cornell University Medical College, New York, NY 10021
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Structural requirements of peptide hormone binding for peptide-potentiated self-association of bovine neurophysin II. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(18)68275-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Lazure C, Saayman HS, Naudé RJ, Oelofsen W, Chrétien M. Complete amino acid sequence of a VLDV-type neurophysin from ostrich differs markedly from known mammalian neurophysins. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1987; 30:634-45. [PMID: 3436699 DOI: 10.1111/j.1399-3011.1987.tb03374.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The neurohypophyseal hormones vasopressin and oxytocin are known to be synthesized in eutherian mammals as part of larger precursors containing either MSEL- or VLDV-neurophysins. A neurophysin has been isolated from ostrich neurohypophyses and shown by partial amino acid sequence determination to be related to mammalian VLDV-neurophysin. The present report describes the complete amino acid sequence of this ostrich neurophysin containing 93 residues. This amino acid sequence, the first reported in birds, differs in a remarkable manner from its mammalian homolog. Indeed, it contains a large number of substitutions, including one insertion, distributed throughout the polypeptide chain when compared to known VLDV-neurophysins. Whereas many of these substitutions are localized inside the so-called constant region of the neurophysin, the highest variation can be found in the COOH-terminal region.
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Affiliation(s)
- C Lazure
- Laboratory of Biochemical Neuroendocrinology, Clinical Research Institute of Montreal, Canada
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Rabbani LD, Pagnozzi M, Chang P, Breslow E. Partial digestion of neurophysins with proteolytic enzymes: unusual interactions between bovine neurophysin II and chymotrypsin. Biochemistry 1982; 21:817-26. [PMID: 7074053 DOI: 10.1021/bi00534a001] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Bovine neurophysin II was partially digested by chymotrypsin and by chymotrypsin followed by carboxy-peptidase B to produce large fragments collectively representing deletions of residues 1-5 and 91-95. All such fragments were capable of binding peptides to the principal hormone-binding site of neurophysin with normal or near-normal affinity, indicating that residues 1-5 and 91-95 do not directly participate in binding. In addition, preliminary results with thermolysin-derived fragments suggested that residue 6 does not participate in peptide binding. During the course of chymotrypsin studies, it was demonstrated that bovine neurophysin II behaves as a transient competitive inhibitor of chymotrypsin; for neurophysin-peptide complexes, Ki congruent to 8 x 10(-6) M. This inhibition is dependent on neurophysin conformation and is relieved by the anomalous preferential splitting by chymotrypsin of Arg-Arg and Phe-Pro bonds near the carboxyl terminus of neurophysin II. It is suggested that this phenomenon might reflect the interaction of neurophysin II with a chymotrypsin-related enzyme in the pituitary. One approach used in the study of binding properties of proteolytically modified neurophysin was affinity chromatography; the preparation and properties of a conveniently prepared affinity column for neurophysin are described.
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Abercrombie DM, McCormick WM, Chaiken IM. Photoaffinity labeling of the hormone binding site of neurophysin. J Biol Chem 1982. [DOI: 10.1016/s0021-9258(18)34917-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Lord ST, Breslow E. Synthesis of peptide spin-labels that bind to neurophysin and their application to distance measurements within neurophysin complexes. Biochemistry 1980; 19:5593-602. [PMID: 7459333 DOI: 10.1021/bi00565a021] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The synthesis of two spin-labels capable of binding to the hormone-binding site(s) of neurophysin is described. The two spin-labels are 4-(glycyl-L-phenylalanylamido)-2,2,6,6-tetramethylpiperidinyl-1-oxy and S-[[[3-(2,2,5,5-tetramethylpyrrolidine-1-oxy)amino]carbonyl]methyl]-L-cysteinyl -L-tyrosine amide; synthesis of the former is achieved by a novel route to circumvent problems associated with nitroxide instability under standard conditions of peptide deblocking. NMR studies of the effects of binding these spin-labels on relaxation rates of individual proton resonances of neurophysin were used to calculate correlation times and distances between the bound nitroxides and the observed protons. The results indicate that residue 3 of peptides bound to the strong site of neurophysin is greater than or equal to 14 A from Tyr-49 and argue against a distance of < 5 A between the ortho ring protons of Tyr-49 and those of residue 2 of peptides bound to the strong site. Alternatively, the data suggest that the previously observed nuclear Overhauser effect between these protons reflects spin diffusion at the strong site and a contribution of uncertain magnitude from a second but very weak binding site; this second site is close to Tyr-49 and is detected by the increased relaxation rate of Tyr-49 ring protons when 4-(glycyl-L-phenylalanylamido)-2,2,6,6-tetramethylpiperidinyl-1-oxy is displaced from the strong site by competing diamagnetic peptide. Additionally, the data indicate that residue 3 of bound peptides at the strong site is distant from His-80 but approximately 12 A from the amino terminus. The extended side chain of residue 1 of peptides at the strong site is calculated as less than or equal to 10 A from Tyr-49.
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Pearlmutter AF, Dalton EJ. Stopped-flow investigation of nitrated bovine neurophysin monomer binding to oxytocin. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1980; 16:477-81. [PMID: 7216623 DOI: 10.1111/j.1399-3011.1980.tb02972.x] [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: 01/24/2023]
Abstract
By use of stopped-flow kinetic data, we have measured the kinetics of mononitrated neurophysin I monomer binding to oxytocin. The association constant was 1.3(+/-0.3) x 10(5) M-1s-1 and the dissociation rate constant was 2.0(+/-0.5)s-1 for protonated oxytocin binding. Both rates are significantly slower than those observed for neurophysin dimer. These data suggest that the binding process by which the monomer binds oxytocin is not identical to that of dimer.
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Acher R. Neurophysins: molecular and cellular aspects. ANGEWANDTE CHEMIE (INTERNATIONAL ED. IN ENGLISH) 1979; 18:846-60. [PMID: 118684 DOI: 10.1002/anie.197908461] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Cohen P, Nicolas P, Camier M. Biochemical aspects of neurosecretion: neurophysin--neurohypophyseal hormone complexes. CURRENT TOPICS IN CELLULAR REGULATION 1979; 15:263-318. [PMID: 527370 DOI: 10.1016/b978-0-12-152815-7.50011-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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CHAUVET MT, CHAUVET J, ACHER R. The Neurohypophysial Hormone-Binding Proteins: Complete Amino-Acid Sequence of Ovine and Bovine MSEL-Neurophysins. ACTA ACUST UNITED AC 1976. [DOI: 10.1111/j.1432-1033.1976.tb10932.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chauvet M, Chauvet J, Acher R. The complete amino acid sequence of the major ovine neurophysin (MSEL-neurophysin); comparison with a re-investigated bovine MSEL-neurophysin. FEBS Lett 1975; 58:234-7. [PMID: 1225586 DOI: 10.1016/0014-5793(75)80267-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Schlesinger DH, Ernst M, Nicholas A, Watkins WB, Walter R. Complete amino acid sequence of ovine neurophysin-III. FEBS Lett 1975; 57:55-9. [PMID: 1236812 DOI: 10.1016/0014-5793(75)80151-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Interactions of bovine neurophysins with neurohypophyseal hormones. On the role of tyrosine-49. J Biol Chem 1975. [DOI: 10.1016/s0021-9258(19)41298-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Ramasamy I, Butterworth PJ. Nicotinamide-adenine dinucleotide inhibition of pig kidney alkaline phosphatase. BIOCHIMICA ET BIOPHYSICA ACTA 1975; 384:146-58. [PMID: 236767 DOI: 10.1016/0005-2744(75)90104-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
1. The interaction of NAD+, NADH and various nucleotide analogues with pig kidney alkaline phosphatase (orthophosphoric-monoester phosphohydrolase (alkaline optimum) EC 3.1.3.1) has been investigated by kinetic means. Some inhibitors act uncompetitively whereas others markedly increase the slopes of double reciprocal plots suggesting they have some affinity for the free enzyme. 2. The compounds seem to bind to alkaline phosphatase through interactions of their bases with a relatively non-specific region of the enzyme, although it is likely that for those nucleotides having some affinity for the free enzyme there is some attraction between the pyrophosphate backbone and the active site. 3. From studies of the effect of NAD+ and NADH on ATPase activity it was concluded that the substrate inhibition that is characteristic of the ATPase activity of alkaline phosphatase originates from binding of ATP to the site assumed to exist for NAD+ and NADH. The potentiation of NAD+-inhibition of ATPase activity by Mg-2+ is probably a result of the depletion of [ATP-4-] the true substrate. The depletion allows NAD+ to complete more effectively for the active site. 4. Binding of NADH is favoured by protonation of an enzymic group with a pK of approx. 9.0 belonging possibly to a tyrosine residue or a zinc hydrate. 5. A large entropy decrease was found to accompany the binding of NAD+ and NADH to alkaline phosphatase. This may be further evidence of an "induced-fit" mechanism previously suspected because of the synergistic inhibitory effects of adenosine and nicotinamide.
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Livett BG. Immunochemical studies on the storage and axonal transport of neurophysins in the hypothalamo-neurohypophyseal system. Ann N Y Acad Sci 1975; 248:112-33. [PMID: 804289 DOI: 10.1111/j.1749-6632.1975.tb34180.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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30
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Cohen P, Camier M, Wolff J, Alazard R, Cohen JS, Griffin JH. Studies of bovine neurophysin-neurohypophyseal hormone interactions. Ann N Y Acad Sci 1975; 248:463-79. [PMID: 235235 DOI: 10.1111/j.1749-6632.1975.tb34207.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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31
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Breslow E. On the mechanism of binding of neurohypophyseal hormones and analogs to neurophysins. Ann N Y Acad Sci 1975; 248:423-41. [PMID: 1054557 DOI: 10.1111/j.1749-6632.1975.tb34203.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Di Bello C, Griffin JH. Circular dichroism and absorbance properties of nitrotyrosyl chromophores in staphylococcal nuclease and in a model diketopiperazine. J Biol Chem 1975. [DOI: 10.1016/s0021-9258(19)41833-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Alazard R, Cohen P, Cohen JS, Griffin JH. Interactions of Bovine Neurophysin II with Oxytocin and [8-Lysine] Vasopressin. J Biol Chem 1974. [DOI: 10.1016/s0021-9258(19)42142-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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34
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Complex Formation between Bovine Neurophysin-I and Oxytocin, Vasopressin, and Tripeptide Analogs of Their NH2-terminal Region. J Biol Chem 1973. [DOI: 10.1016/s0021-9258(19)43181-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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35
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Glasel JA, Hruby VJ, McKelvy JF, Spatola AF. Deuteron magnetic resonance studies on the microdynamical behavior of partially deuterated oxytocin with neurophysin. J Mol Biol 1973; 79:555-75. [PMID: 4758065 DOI: 10.1016/0022-2836(73)90406-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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36
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Hope DB, Wálti M. (2-(3-Nitrotyrosine))oxytocin, a wealky activity analogue of the hormone bound by neurophysin. Biochem J 1973; 135:241-3. [PMID: 4776869 PMCID: PMC1165810 DOI: 10.1042/bj1350241] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
An analogue of oxytocin containing a nitro group ortho to the phenolic hydroxyl group of the tyrosyl residue was prepared by nitration of the hormone with tetranitromethane. [2-(3-Nitro-l-tyrosine)]oxytocin was bound by neurophysin although its pharmacological activity was virtually abolished. The oxytocic activity of the analogue on the isolated rat uterus was 1.1i.u./mg.
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Pickup JC, Johnston CI, Nakamura S, Uttenthal LO, Hope DB. Subcellular organization of neurophysins, oxytocin, (8-lysine)-vasopressin and adenosine triphosphatase in porcine posterior pituitary lobes. Biochem J 1973; 132:361-71. [PMID: 4269306 PMCID: PMC1177599 DOI: 10.1042/bj1320361] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Posterior pituitary lobes from young pigs were fractionated by differential and sucrose-density-gradient centrifugation. The distributions of oxytocin and [8-lysine]-vasopressin were measured by bioassay and the distributions of neurophysin-I and -II by radioimmunoassays specific for each of these two proteins. Most of the hormone and neurophysin applied to the density gradient was localized in particles with the density expected of neurosecretory granules. However, the neurosecretory granules were separated into two bands (D and E). A close statistical correlation between the distributions of [8-lysine]-vasopressin and neurophysin-I, and of oxytocin and neurophysin-II on the gradients, suggested that in vivo porcine neurophysin-I binds [8-lysine]-vasopressin within one population of granules and porcine neurophysin-II binds oxytocin within another type of granule. However, there was no significant separation of oxytocin and vasopressin in fractions D and E. The molar ratios of hormones and neurophysins indicated that there was insufficient of either neurophysin to bind the [8-lysine]-vasopressin in the granule fractions or in the whole gland. Polyacrylamide-gel electrophoresis showed that only bands corresponding in mobility to porcine neurophysins-I, -II and -III were present in large amounts in the whole gland and in the granule fractions. The component with the mobility of neurophysin-III was, however, relatively enriched in whole young glands and granule fractions compared with adult gland extracts. It is suggested that the vasopressin that cannot be assigned to neurophysin-I may occur in (a) vesicles containing vasopressin but no neurophysin, (b) vesicles containing vasopressin and a protein that cannot be quantified by the radioimmunoassays used, such as porcine neurophysin-III, or (c) normal vasopressin-neurophysin granules which have accumulated extra vasopressin. Band E of the gradient was rich in adenosine triphosphatase activity, whereas band D possessed very little of this enzyme.
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Cohen P, Griffin JH, Camier M, Caizergues M, Fromageot P, Cohen JS. Hormonal interactions at the molecular level: A high resolution proton magnetic resonance study of bovine neurophysins and their interactions with oxytocin. FEBS Lett 1972; 25:282-286. [PMID: 11946770 DOI: 10.1016/0014-5793(72)80504-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- P Cohen
- Laboratoire de Biochimie de la Faculté des Sciences de Rouen, 76, Mt. St. Aignan, France
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Breslow E, Weis J. Contribution of tyrosine to circular dichroism changes accompanying neurophysin-hormone interaction. Biochemistry 1972; 11:3474-82. [PMID: 5066443 DOI: 10.1021/bi00768a023] [Citation(s) in RCA: 45] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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40
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Hope DB, Wälti M. (1-(1-2-Hydroxy-3-mercaptopropanoic acid))-oxytocin, a highly potent analogue of oytocin not bound by neurophysin. Biochem J 1971; 125:909-11. [PMID: 5169441 PMCID: PMC1178197 DOI: 10.1042/bj1250909] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Sachs H, Goodman R, Osinchak J, McKelvy J. Supraoptic neurosecretory neurons of the guinea pig in organ culture. Biosynthesis of vasopressin and neurophysin. Proc Natl Acad Sci U S A 1971; 68:2782-6. [PMID: 5288257 PMCID: PMC389524 DOI: 10.1073/pnas.68.11.2782] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Fragments of the anterior hypothalamus that contain supraoptic nuclei and short axonal segments from adult guinea pigs have been kept in organ culture for up to 15 days. Electron micrographs displayed intact nuclei, Nissl substance, Golgi bodies, and an ultrastructure characteristic of viable neurosecretory cells; by contrast, the surrounding neurophil showed extensive degeneration. The cultured hypothalamic tissues of the guinea pig that were pulsed with [(3)H]uridine incorporated label into the RNA of neurosecretory neurons, as determined by radioautography and chemical analysis. Furthermore, and most important, these cells retained a complement of hormones and the ability to incorporate (3)H- and (35)S-labeled amino acids into vasopressin, neurophysin, and other polypeptides. This incorporation was inhibited by either puromycin or cycloheximide.
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42
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Norström A, Sjöstrand J, Livett BG, Uttenthal LO, Hope DB. Electrophoretic and immunological characterization of rat neurophysin. Biochem J 1971; 122:671-6. [PMID: 5001954 PMCID: PMC1176835 DOI: 10.1042/bj1220671] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
1. The electrophoretic properties of rat posterior pituitary proteins have been compared on starch gel with those of bovine and porcine neurophysins. 2. [(35)S]-Cysteine was injected into the supraoptic nucleus of male rats and 16-24h later the distribution of labelled neural-lobe protein in starch and polyacrylamide gels was determined. In both systems a single major protein component was found to contain more than 80% of the total recovered radioactivity. Between 5 and 10% of the radioactivity was found in a minor component in polyacrylamide gel. 3. In agar, microimmuno-diffusion and -electrophoresis of the rat neural-lobe proteins gave a single arc with neurophysin antiserum, and after starch-gel electrophoresis this arc was shown to be due to the major labelled component. 4. The molecular weights of the rat neural-lobe proteins were estimated by polyacrylamide-gel electrophoresis in the presence of sodium dodecyl sulphate. The molecular weight of the major labelled component was found to be 12000. 5. It is concluded that the rat neurophysin consists of one major and possibly one minor component.
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45
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Schlesinger DH, Capra JD, Schwartz IL, Walter R. Position of the methionine residue in bovine neurophysin II. EXPERIENTIA 1971; 27:213. [PMID: 5101649 DOI: 10.1007/bf02145902] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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46
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Breslow E. Optical activity of bovine neurophysins and their peptide complexes in the near ultraviolet. Proc Natl Acad Sci U S A 1970; 67:493-500. [PMID: 5289004 PMCID: PMC283234 DOI: 10.1073/pnas.67.2.493] [Citation(s) in RCA: 42] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Circular dichroism studies of the bovine neurophysins in the near ultraviolet show a strong negative band at 280 nm and a strong positive band at 248 nm, both of which are attributable almost exclusively to disulfide transitions. The ellipticities per disulfide bond of the unresolved bands in neurophysin-II are -2900 deg cm(2)/decimole and +2300 deg cm(2)/decimole at 280 nm and 248 nm, respectively. Binding of oxytocin, vasopressin, or the peptide S-methyl-L-cysteinyl-L-tyrosyl-L-phenylalanine amide lead to large changes in optical activity in the near and far ultraviolet. Of these circular dichroism changes above 290 nm are attributed to changes in the optical activity of neurophysin disulfides, while changes elsewhere are more generally ascribed to changes in either disulfide, tyrosine, or peptide bond transitions. Optical rotatory dispersion studies show that calcium ion, at concentrations of 0.01 M, has only trivial effects on the affinity of bovine neurophysins for oxytocin.
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