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  • 1
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    Negative regulation by HLA-DO of MHC class II-restricted antigen processing (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-10-06
    Description: HLA-DM is a major histocompatibility complex (MHC) class II-like molecule that facilitates antigen processing by catalyzing the exchange of invariant chain-derived peptides (CLIP) from class II molecules for antigenic peptides. HLA-DO is a second class II-like molecule that physically associates with HLA-DM in B cells. HLA-DO was shown to block HLA-DM function. Purified HLA-DM-DO complexes could not promote peptide exchange in vitro. Expression of HLA-DO in a class II+ and DM+, DO- human T cell line caused the accumulation of class II-CLIP complexes, indicating that HLA-DO blocked DM function in vivo and suggesting that HLA-DO is an important modulator of class II-restricted antigen processing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Denzin, L K -- Sant'Angelo, D B -- Hammond, C -- Surman, M J -- Cresswell, P -- AI14579/AI/NIAID NIH HHS/ -- AI23081/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1997 Oct 3;278(5335):106-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Immunobiology, Howard Hughes Medical Institute, Yale University School of Medicine, 310 Cedar Street, New Haven, CT 06510, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9311912" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Antigen Presentation ; Antigens, Differentiation, B-Lymphocyte/metabolism ; B-Lymphocytes/*immunology ; HLA-D Antigens/*metabolism ; HLA-DR3 Antigen/metabolism ; Histocompatibility Antigens Class II/metabolism ; Humans ; Molecular Sequence Data ; *Nuclear Proteins ; T-Lymphocytes/*immunology ; Trans-Activators/genetics ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Tandem riboswitch architectures exhibit complex gene control functions (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-10-14
    Description: Riboswitches are structured RNAs typically located in the 5' untranslated regions of bacterial mRNAs that bind metabolites and control gene expression. Most riboswitches sense one metabolite and function as simple genetic switches. However, we found that the 5' region of the Bacillus clausii metE messenger RNA includes two riboswitches that respond to S-adenosylmethionine and coenzyme B12. This tandem arrangement yields a composite gene control system that functions as a two-input Boolean NOR logic gate. These findings and the discovery of additional tandem riboswitch architectures reveal how simple RNA elements can be assembled to make sophisticated genetic decisions without involving protein factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sudarsan, Narasimhan -- Hammond, Ming C -- Block, Kirsten F -- Welz, Rudiger -- Barrick, Jeffrey E -- Roth, Adam -- Breaker, Ronald R -- GM 068819/GM/NIGMS NIH HHS/ -- GM 07223-31/GM/NIGMS NIH HHS/ -- R01 GM068819/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Oct 13;314(5797):300-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular, Cellular and Developmental Biology, Yale University, Post Office Box 208103, New Haven, CT 06520-8103, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17038623" target="_blank"〉PubMed〈/a〉
    Keywords: 5' Untranslated Regions/*metabolism ; Aptamers, Nucleotide/chemistry/metabolism ; Bacillus/*genetics/growth & development/metabolism ; Base Sequence ; Cobamides/*metabolism/pharmacology ; *Gene Expression Regulation, Bacterial ; Genes, Bacterial ; Ligands ; Methionine/biosynthesis/pharmacology ; Molecular Sequence Data ; Nucleic Acid Conformation ; RNA, Bacterial/chemistry/genetics/metabolism ; RNA, Messenger/chemistry/genetics/metabolism ; S-Adenosylmethionine/*metabolism ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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    PAPER CURRENT
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