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41.
Critical role of an eight-amino acid sequence of VP1 in neutralization of poliovirus type 3 总被引:1,自引:0,他引:1
The three serotypes of poliovirus are members of the picornaviradae, a group of viruses which cause a variety of diseases of considerable importance in man and animals. We have previously used antigenic mutants resistant to neutralizing monoclonal antibodies to identify a single antigenic site for the neutralization of poliovirus type 3 (ref. 1). Evidence based on oligonucleotide mapping suggested that this site corresponded largely to one physicochemical region of the capsid protein viral polypeptide 1 (VP1). We now present conclusive evidence that most of the mutations conferring resistance to neutralization are confined to an eight-amino acid region of VP1, specified by a sequence of viral RNA 277-300 bases from the start of the region coding for VP1. These data strongly suggest that this small region constitutes a major antigenic site involved in virus neutralization and they provide the most detailed information currently available on the antigenic site of a human virus. 相似文献
42.
The c-erb-A gene encodes a thyroid hormone receptor 总被引:143,自引:0,他引:143
The cDNA sequence of human c-erb-A, the cellular counterpart of the viral oncogene v-erb-A, indicates that the protein encoded by the gene is related to the steroid hormone receptors. Binding studies with the protein show it to be a receptor for thyroid hormones. 相似文献
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M. L. Barrett A. M. Scutt F. J. Evans 《Cellular and molecular life sciences : CMLS》1986,42(4):452-453
Summary Two novel prenylat flavones, termed Cannflavin A and B, were isolated from the cannabinoid free ethanolic extract ofCannabis sativa L. Both compounds inhibited prostaglandin E2 production by human rheumatoid synovial cells in culture.This communication is dedicated to the memory of the late Professor J. W. Fairbairn and the late Dr. J. T. Pickens. We are grateful to the Medical Research Council for a project grant and to Ms J. Elliot of King's College London for NMR spectra. 相似文献
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Structure of mouse kallikrein gene family suggests a role in specific processing of biologically active peptides 总被引:34,自引:0,他引:34
The glandular kallikrein gene family comprises 25-30 highly homologous genes that encode specific proteases involved in the processing of biologically active peptides. In the mouse all the members of this family are closely linked on chromosome 7. The 9.5-kilobase nucleotide sequence of a mouse genomic clone contains one complete kallikrein gene (mGK-1), which is expressed in the male mouse submaxillary gland, and the 3' end of another (mGK-2). Differences in the coding potential of these genes and the amino acid sequences of other known kallikreins seem to be functionally related to the substrate specificity of the different enzymes. 相似文献
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Summary A comparison of antagonism by bicuculline or strychnine of the effects of GABA or etomidate on rat isolated superior cervical ganglia, frog isolated hemisected spinal cords and rat central neurones in vivo indicates that etomidate has GABA-mimetic actions.Acknowledgments. This work was supported by the Medical Research Council and etomidate was provided by Janssen Pharmaceutica. 相似文献
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Possible placental origin of ACTH in normal human pregnancy. 总被引:8,自引:0,他引:8
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