1
|
Song W, Ao MZ, Shi Y, Yuan LF, Yuan XX, Yu LJ. Interaction between phillygenin and human serum albumin based on spectroscopic and molecular docking. Spectrochim Acta A Mol Biomol Spectrosc 2012; 85:120-126. [PMID: 22000638 DOI: 10.1016/j.saa.2011.09.044] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Revised: 09/18/2011] [Accepted: 09/21/2011] [Indexed: 05/31/2023]
Abstract
In this paper, the interaction of human serum albumin (HSA) with phillygenin was investigated by fluorescence, circular dichroism (CD), UV-vis spectroscopic and molecular docking methods under physiological conditions. The Stern-Volmer analysis indicated that the fluorescence quenching of HSA by phillygenin resulted from static mechanism, and the binding constants were 1.71×10(5), 1.61×10(5) and 1.47×10(4) at 300, 305 and 310K, respectively. The results of UV-vis spectra show that the secondary structure of the protein has been changed in the presence of phillygenin. The CD spectra showed that HSA conformation was altered by phillygenin with a major reduction of α-helix and an increase in β-sheet and random coil structures, indicating a partial protein unfolding. The distance between donor (HSA) and acceptor (phillygenin) was calculated to be 3.52nm and the results of synchronous fluorescence spectra showed that binding of phillygenin to HSA can induce conformational changes in HSA. Molecular docking experiments found that phillygenin binds with HSA at IIIA domain of hydrophobic pocket with hydrogen bond interactions. The ionic bonds were formed with the O (4), O (5) and O (6) of phillygenin with nitrogen of ASN109, ARG186 and LEU115, respectively. The hydrogen bonds are formed between O (2) of phillygenin and SER419. In the presence of copper (II), iron (III) and alcohol, the apparent association constant K(A) and the number of binding sites of phillygenin on HSA were both decreased in the range of 88.84-91.97% and 16.09-18.85%, respectively. In view of the evidence presented, it is expected to enrich our knowledge of the interaction dynamics of phillygenin to the important plasma protein HSA, and it is also expected to provide important information of designs of new inspired drugs.
Collapse
Affiliation(s)
- W Song
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
| | | | | | | | | | | |
Collapse
|
2
|
Charoenvit Y, Fallarme V, Rogers WO, Sacci JB, Kaur M, Aguiar JC, Yuan LF, Corradin G, Andersen E, Wizel B, Houghten RA, Oloo A, De la Vega P, Hoffman SL. Development of two monoclonal antibodies against Plasmodium falciparum sporozoite surface protein 2 and mapping of B-cell epitopes. Infect Immun 1997; 65:3430-7. [PMID: 9234808 PMCID: PMC175485 DOI: 10.1128/iai.65.8.3430-3437.1997] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The Plasmodium yoelii sporozoite surface protein 2 (PySSP2) is the target of protective cellular immunity. Cytotoxic T cells specific for the Plasmodium falciparum analog PfSSP2, also known as thrombospondin-related anonymous protein (TRAP), are induced in human volunteers immunized with irradiated sporozoites. PfSSP2 is an important candidate antigen for a multicomponent malaria vaccine. We generated and characterized three monoclonal antibodies (MAbs) specific for PfSSP2/TRAP. The MAbs PfSSP2.1 (immunoglobulin G1 [IgG1]), PfSSP2.2 (IgG2a), and PfSSP2.3 (IgM) were species specific and identified three distinct B-cell epitopes containing sequences DRYI, CHPSDGKC, and TRPHGR, respectively. PfSSP2.1 partially inhibited P. falciparum liver-stage parasite development in human hepatocyte cultures (42 and 86% in two experiments at 100 microg/ml). Mice immunized with vaccinia virus expressing full-length PfSSP2 protein produced antibodies to (DRYIPYSP)3, and humans living in malaria-endemic areas (Indonesia and Kenya), who have lifelong exposure and partial clinical immunity to malaria, had antibodies to both (DRYIPYSP)3 and (CHPSDGKCN)2. Mice immunized with multiple antigen peptides MAP4 (DRYIPYSP)3P2P30 and MAP4 (CHPSDGKCN)3P2P30 in TiterMax developed antibodies to sporozoites that partially inhibited sporozoite invasion of human hepatoma cells (39 to 71% at a serum dilution of 1:50 in three different experiments). The modest inhibitory activities of the MAbs and the polyclonal antibodies to PfSSP2/TRAP epitopes do not suggest that a single-component vaccine designed to induce antibodies against PfSSP2/TRAP will be protective. Nonetheless, the MAbs directed against PfSSP2, and the peptides recognized by these MAbs, will be essential reagents in the development of PfSSP2/TRAP as a component of a multivalent P. falciparum human malaria vaccine.
Collapse
Affiliation(s)
- Y Charoenvit
- Malaria Program, Naval Medical Research Institute, Bethesda, Maryland 20889-5607, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
3
|
Li J, Eisensmith RC, Wang T, Lo WH, Huang SZ, Zeng YT, Yuan LF, Liu SR, Woo SL. Phenylketonuria in China: identification and characterization of three novel nucleotide substitutions in the human phenylalanine hydroxylase gene. Hum Mutat 1994; 3:312-4. [PMID: 8019568 DOI: 10.1002/humu.1380030323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- J Li
- Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030
| | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Jones TR, Yuan LF, Marwoto HA, Gordon DM, Wirtz RA, Hoffman SL. Low immunogenicity of a Plasmodium vivax circumsporozoite protein epitope bound by a protective monoclonal antibody. Am J Trop Med Hyg 1992; 47:837-43. [PMID: 1471743 DOI: 10.4269/ajtmh.1992.47.837] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The repeat region of the Plasmodium vivax circumsporozoite (CS) protein contains 20 copies of the nine-amino acid sequence DRA A/D GQPAG. A monoclonal antibody that passively protects monkeys against sporozoite challenge recognizes a four-amino acid linear sequence AGDR included within this nonamer, but when monkeys were immunized with a vaccine, NS1(81)V20, which contains 20 copies of the nonamer, they failed to produce antibodies to AGDR. To determine if natural exposure to sporozoites induces antibodies to AGDR, we tested sera from 176 individuals from a malaria-endemic area in Flores, Indonesia. Seventy-one percent of the adults had antibodies to the P. vivax repeat region; only 18% had detectable antibodies to AGDR. None of the subjects had antibodies to the P. vivax variant repeat ANGAGNQPG. We next tested sera from six human volunteers immunized with NS1(81)V20 and found that the vaccine, despite inducing antibodies against the nonamer, as it did in the monkeys, did not induce antibodies against AGDR. To further test our ability to raise anti-AGDR antibodies using synthetic peptides, we immunized Aotus monkeys and BALB/c mice with AGDR. Sera from the mice reacted strongly with both AGDR and a recombinant protein containing the 20 copies of the nonamer. Sera from the monkeys reacted only minimally with a protein (VIVAX-1) that contains monomeric AGDR within its sequence. Sera from the mice also bound air-dried P. vivax sporozoites, while sera from the monkeys did not.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- T R Jones
- Naval Medical Research Institute, Rockville, Maryland
| | | | | | | | | | | |
Collapse
|
5
|
Abstract
Three novel missense mutations have been identified in the phenylalanine hydroxylase (PAH) genes of Chinese individuals afflicted with various degrees of phenylketonuria (PKU). A T-to-C transition was observed in exon 5 of the gene, resulting in the substitution of Phe161 by Ser161. Two substitutions, G-to-T and T-to-G, were observed in exon 7, resulting in the substitution of Gly247 by Val247 and Leu255 by Val255, respectively. Expression analysis demonstrated that these mutant proteins produced between 0 and 15% of normal PAH enzyme activity. Population screening of a Chinese sample population indicates that these mutations are quite rare, together accounting for only about 4% of all PKU alleles among the Chinese. The P161S and G247V mutations were each present on a single PAH RFLP haplotype 4 chromosome in patients form Northern China, while the L255V mutation was present on chromosomes of both haplotypes 18 and 21 in patients from Southern China. These results suggest that the remaining 30% of uncharacterized PKU alleles in the Chinese population may bear a large number of relatively rare PAH mutations.
Collapse
Affiliation(s)
- J Li
- Howard Hughes Medical Institute, Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030
| | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Wang T, Okano Y, Eisensmith RC, Lo WH, Huang SZ, Zeng YT, Yuan LF, Liu SR, Woo SL. Identification of three novel PKU mutations among Chinese: Evidence for recombination or recurrent mutation at the PAH locus. Genomics 1992; 13:230-1. [PMID: 1349576 DOI: 10.1016/0888-7543(92)90229-l] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Three novel mutations have been identified in the phenylalanine hydroxylase (PAH) genes of Chinese classical phenylketonuria (PKU) patients. Two of these substitutions (W326X and Y356X) result in the generation of a premature stop codon, while the third (IVS-7nt2) alters an invariant dinucleotide splicing signal. These mutations together account for about 10% of all PKU alleles in the Chinese population. The W326X mutation is associated with PAH RFLP haplotype 4, the most common haplotype in Orientals, while the IVS-7nt2 mutation occurs once on a haplotype 7 chromosome. The Y356X mutation is associated with multiple haplotypes, possibly due to crossover, gene conversion, or recurrent mutation.
Collapse
Affiliation(s)
- T Wang
- Department of Cell Biology, Howard Hughes Medical Institute, Baylor College of Medicine, Houston, Texas 77030
| | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Wang T, Okano Y, Eisensmith RC, Lo WH, Huang SZ, Zeng YT, Yuan LF, Liu SR, Woo SL. Missense mutations prevalent in Orientals with phenylketonuria: molecular characterization and clinical implications. Genomics 1991; 10:449-56. [PMID: 2071149 DOI: 10.1016/0888-7543(91)90331-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Two missense mutations in the phenylalanine hydroxylase (PAH) genes of Orientals with phenylketonuria (PKU) have been identified. A G-to-A transition in exon 7 of the gene results in the substitution of Gln243 for Arg243 (R243Q) and accounts for 18% of all PKU chromosomes among Chinese. An A-to-G transition in exon 6 of the gene results in the substitution of Cys204 for Tyr204 (Y204C) and identifies about 13 and 5% of all PKU chromosomes in the Chinese and Japanese populations, respectively. The R243Q construct produced less than 10% of normal PAH activity in in vitro expression analysis in a eukaryotic cell system, and patients homozygous for this substitution exhibit a severe clinical phenotype. These results are consistent with previous findings in this expression system. The Y204C construct, however, produced near normal levels of PAH enzyme activity and immunoreactivity in this in vitro expression system. Because this substitution is present only on PKU chromosomes, it is a valuable marker for identifying the corresponding mutant allele for carrier screening of PKU. With the characterization of these two substitutions, about 60% of PKU alleles in China can now be identified. The continuing search for additional PKU mutations will permit effective carrier screening and prenatal gene diagnosis of PKU in East Asia.
Collapse
Affiliation(s)
- T Wang
- Howard Hughes Medical Institute, Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030
| | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Wang T, Okano Y, Eisensmith RC, Harvey ML, Lo WH, Huang SZ, Zeng YT, Yuan LF, Furuyama JI, Oura T. Founder effect of a prevalent phenylketonuria mutation in the Oriental population. Proc Natl Acad Sci U S A 1991; 88:2146-50. [PMID: 2006152 PMCID: PMC51186 DOI: 10.1073/pnas.88.6.2146] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A missense mutation has been identified in the human phenylalanine hydroxylase [PAH; phenylalanine 4-monooxygenase; L-phenylalanine, tetrahydrobiopterin:oxygen oxidoreductase (4-hydroxylating), EC 1.14.16.1] gene in a Chinese patient with classic phenylketonuria (PKU). A G-to-C transition at the second base of codon 413 in exon 12 of the gene results in the substitution of Pro413 for Arg413 in the mutant protein. This mutation (R413P) results in negligible enzymatic activity when expressed in heterologous mammalian cells and is compatible with a classic PKU phenotype in the patient. Population genetic studies reveal that this mutation is tightly linked to restriction fragment length polymorphism haplotype 4, which is the predominant haplotype of the PAH locus in the Oriental population. It accounts for 13.8% of northern Chinese and 27% of Japanese PKU alleles, but it is rare in southern Chinese (2.2%) and is absent in the Caucasian population. The data demonstrate unambiguously that the mutation occurred after racial divergence of Orientals and Caucasians and suggest that the allele has spread throughout the Orient by a founder effect. Previous protein polymorphism studies in eastern Asia have led to the hypothesis that "northern Mongoloids" represented a founding population in Asia. Our results are compatible with this hypothesis in that the PKU mutation might have occurred in northern Mongoloids and subsequently spread to the Chinese and Japanese populations.
Collapse
Affiliation(s)
- T Wang
- Howard Hughes Medical Institute, Department of Cell Biology, Baylor College of Medicine, Houston, TX 77030
| | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Charoenvit Y, Mellouk S, Cole C, Bechara R, Leef MF, Sedegah M, Yuan LF, Robey FA, Beaudoin RL, Hoffman SL. Monoclonal, but not polyclonal, antibodies protect against Plasmodium yoelii sporozoites. J Immunol 1991; 146:1020-5. [PMID: 1988490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
One of the primary strategies for malaria vaccine development has been to design subunit vaccines that induce protective levels of antibodies against the circumsporozoite (CS) protein of malaria sporozoites. In the Plasmodium yoelii mouse model system such vaccines have been uniformly unsuccessful in protecting against sporozoite-induced malaria. To demonstrate that antibodies to P. yoelii CS protein could provide protection we established a passive transfer model. Passive transfer of Navy yoelii sporozoite 1 (NYS1), an IgG3 mAb against the P. yoelii CS protein, protected 100% of mice against challenge with 5000 P. yoelii sporozoites. Binding of NYS1 to sporozoites was inhibited by incubation with (QGPGAP)2, a synthetic peptide derived from the repeat region of the P. yoelii CS protein, indicating that the epitope on sporozoites recognized by this mAb was included within this peptide. The levels of antibodies to (QGPGAP)2 by ELISA, and to sporozoites by indirect fluorescent antibody test and CS precipitation reaction were similar in sera from mice that received NYS1 in passive transfer and were protected against challenge with 5000 sporozoites, and from mice that had been immunized with subunit vaccines containing (QGPGAP)2 but were not protected against challenge with 40-200 sporozoites. To determine if antibody avidity, not absolute concentration could explain the striking differences in protection, we established a thiocyanate elution assay. The results suggest that NYS1, the protective mAb, has a lower avidity for (QGPGAP)2 and for sporozoites than do the vaccine-induced antibodies. Although the results of the conventional antibody assays did not correlate with protection, sera from the protected animals inhibited sporozoite development in mouse hepatocyte cultures significantly more than did the sera from the unprotected, subunit vaccine-immunized animals, correlating with protection. The data clearly demonstrate that antibodies to the CS protein can protect against intense sporozoite infection. Improved understanding of the differences between protective mAb and nonprotective polyclonal antibodies will be important in the further development of malaria vaccines.
Collapse
Affiliation(s)
- Y Charoenvit
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Charoenvit Y, Mellouk S, Cole C, Bechara R, Leef MF, Sedegah M, Yuan LF, Robey FA, Beaudoin RL, Hoffman SL. Monoclonal, but not polyclonal, antibodies protect against Plasmodium yoelii sporozoites. The Journal of Immunology 1991. [DOI: 10.4049/jimmunol.146.3.1020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
One of the primary strategies for malaria vaccine development has been to design subunit vaccines that induce protective levels of antibodies against the circumsporozoite (CS) protein of malaria sporozoites. In the Plasmodium yoelii mouse model system such vaccines have been uniformly unsuccessful in protecting against sporozoite-induced malaria. To demonstrate that antibodies to P. yoelii CS protein could provide protection we established a passive transfer model. Passive transfer of Navy yoelii sporozoite 1 (NYS1), an IgG3 mAb against the P. yoelii CS protein, protected 100% of mice against challenge with 5000 P. yoelii sporozoites. Binding of NYS1 to sporozoites was inhibited by incubation with (QGPGAP)2, a synthetic peptide derived from the repeat region of the P. yoelii CS protein, indicating that the epitope on sporozoites recognized by this mAb was included within this peptide. The levels of antibodies to (QGPGAP)2 by ELISA, and to sporozoites by indirect fluorescent antibody test and CS precipitation reaction were similar in sera from mice that received NYS1 in passive transfer and were protected against challenge with 5000 sporozoites, and from mice that had been immunized with subunit vaccines containing (QGPGAP)2 but were not protected against challenge with 40-200 sporozoites. To determine if antibody avidity, not absolute concentration could explain the striking differences in protection, we established a thiocyanate elution assay. The results suggest that NYS1, the protective mAb, has a lower avidity for (QGPGAP)2 and for sporozoites than do the vaccine-induced antibodies. Although the results of the conventional antibody assays did not correlate with protection, sera from the protected animals inhibited sporozoite development in mouse hepatocyte cultures significantly more than did the sera from the unprotected, subunit vaccine-immunized animals, correlating with protection. The data clearly demonstrate that antibodies to the CS protein can protect against intense sporozoite infection. Improved understanding of the differences between protective mAb and nonprotective polyclonal antibodies will be important in the further development of malaria vaccines.
Collapse
Affiliation(s)
- Y Charoenvit
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | - S Mellouk
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | - C Cole
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | - R Bechara
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | - M F Leef
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | - M Sedegah
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | - L F Yuan
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | - F A Robey
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | - R L Beaudoin
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| | - S L Hoffman
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889-5055
| |
Collapse
|
11
|
Charoenvit Y, Sedegah M, Yuan LF, Gross M, Cole C, Bechara R, Leef MF, Robey FA, Lowell GH, Beaudoin RL. Active and passive immunization against Plasmodium yoelii sporozoites. Bull World Health Organ 1990; 68 Suppl:26-32. [PMID: 1709834 PMCID: PMC2393042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Three subunit vaccines based on the major repeat, (QGPGAP)n, and flanking regions of the Plasmodium yoelii circumsporozoite protein were designed, produced, and tested. All were immunogenic, but none gave consistent protection against a 40-200 sporozoite challenge. To demonstrate that antibodies to P. yoelii CS protein could provide protection we established a passive transfer model. Passive transfer of NYS1, an IgG3 MAb against the P. yoelii CS protein, protected 100% of mice against challenge with 5000 P. yoelii sporozoites. Binding of NYS1 to sporozoites was inhibited by incubation with (QGPGAP)2, indicating that the epitope on sporozoites recognized by this MAb was included within this peptide. The levels of antibodies to (QGPGAP)2 by ELISA, and to sporozoites by IFAT and CS precipitation reaction were similar in sera from mice that received NYS1 in passive transfer and were protected against challenge with 5000 sporozoites, and from mice that had been immunized with subunit vaccines containing QGPGAP but were not protected against challenge with 40-200 sporozoites. To determine if antibody avidity, not the absolute concentration, could explain the striking differences in protection, we established a thiocyanate elution assay. The results suggest that NYS1, the protective MAb, has a lower avidity for (QGPGAP)2 and for sporozoites than do the vaccine-induced antibodies. The data clearly demonstrate that antibodies to the CS protein can protect against intense sporozoite infection. Improved understanding of the differences between protective MAbs and non-protective polyclonal antibodies will be important in the further development of malaria vaccines.
Collapse
Affiliation(s)
- Y Charoenvit
- Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD
| | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Yuan LF, Wirtz RA, Beaudoin RL. The use of dextran as a blocking agent on nitrocellulose membrane in the analysis of sporozoite antigens of Plasmodium vivax. J Biochem Biophys Methods 1988; 17:135-42. [PMID: 2464018 DOI: 10.1016/0165-022x(88)90044-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Dextran (molecular weight, 71,200) has been found to block the unbound sites of the nitrocellulose membrane, to which antigens have been electroblotted from acrylamide gel, for use in assaying monoclonal antibodies. The use of polysaccharide as a blocking agent allows the antigens on the nitrocellulose membrane to be digested with pronase and subsequently reacted with monoclonal antibodies. Sporozoite antigens of Plasmodium vivax, after being digested with pronase, completely lost their antigenicity to bind to the sporozoite-specific monoclonal antibodies, thus suggesting that they are proteins or protein conjugates in nature. The method described here for qualitative determination of protein antigens requires as little as 2000 sporozoites for each assay.
Collapse
Affiliation(s)
- L F Yuan
- Naval Medical Research Institute, Bethesda, MD 20014
| | | | | |
Collapse
|
13
|
Shi HP, Guo YF, Zhang WM, Yuan LF, Luo HY, Sun NH, Zhao SM, Zhu MG. Diagnosis and prenatal diagnosis of lysosomal storage diseases. Chin Med J (Engl) 1988; 101:383-7. [PMID: 3146466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
|
14
|
Zhao Y, Liu CY, Cheng ZY, Ye LZ, Gao CS, Ma SW, Zhang JC, Shi HP, Yuan LF, Luo HY. [Chromosome analysis of 1133 cases in genetic counseling clinic]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1987; 9:157-64. [PMID: 2958156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
15
|
Charoenvit Y, Leef MF, Yuan LF, Sedegah M, Beaudoin RL. Characterization of Plasmodium yoelii monoclonal antibodies directed against stage-specific sporozoite antigens. Infect Immun 1987; 55:604-8. [PMID: 2434426 PMCID: PMC260381 DOI: 10.1128/iai.55.3.604-608.1987] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
A battery of monoclonal antibodies against Plasmodium yoelii sporozoites was produced. Five of these (NYS1 through NYS5) were selected for characterization. All five were positive in the indirect immunofluorescent antibody test with P. yoelii sporozoites; however, each showed a different immunofluorescence pattern. Although NYS1 (immunoglobulin G3 [IgG3]), NYS2 (IgG3), and NYS3 (IgM) were positive in the circumsporozoite precipitation test, only NYS1 and NYS2 were able to neutralize sporozoite infectivity in mice. NYS4 (IgM) and NYS5 (IgG1) were not positive in the precipitation test and did not protect mice from sporozoite infection. All except NYS4 were species as well as stage specific. NYS4 cross-reacted with sporozoites of P. berghei. Electrophoretic immunoblotting analysis showed that these monoclonal antibodies detected sporozoite antigens of various molecular weights. Inhibition enzyme-linked immunosorbent assays indicated that each recognized a different antigenic epitope. The differences in their immunochemical and biological reactivity make them useful for screening a variety of P. yoelii antigens in recombinant DNA libraries. These antigens will be used in an animal model system for vaccine development.
Collapse
|
16
|
Shi HP, Guo YF, Yuan LF, Luo HY, Zhao SM, Sun NH, Zhu MG. [Prenatal diagnosis of lysosomal storage diseases]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1987; 9:76-8. [PMID: 2954695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
17
|
Shi HP, Yuan LF, Zhang GX, Zhang WM, Guo YF, Luo HY. [Laboratory diagnosis of sphingolipidosis]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1984; 6:446-8. [PMID: 6152779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
18
|
Shi HP, Liu CY, Yuan LF, Guo YF, Zhang GX, Zhang WM, Luo HY. [Prenatal diagnosis of sphingolipidosis]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1984; 6:449-50. [PMID: 6152780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
19
|
Yuan LF, Zhou AQ, Zhang WM, Lo HY, He BZ. [A case of homocystinuria]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1983; 5:382-4. [PMID: 6233023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
20
|
Zhou AQ, Yuan LF, Zhang WM, Luo HY, Liu TC, He BZ. [Case of histidinemia]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1983; 5:246-8. [PMID: 6228319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|