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    A "silent" polymorphism in the MDR1 gene changes substrate specificity (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-23
    Description: Synonymous single-nucleotide polymorphisms (SNPs) do not produce altered coding sequences, and therefore they are not expected to change the function of the protein in which they occur. We report that a synonymous SNP in the Multidrug Resistance 1 (MDR1) gene, part of a haplotype previously linked to altered function of the MDR1 gene product P-glycoprotein (P-gp), nonetheless results in P-gp with altered drug and inhibitor interactions. Similar mRNA and protein levels, but altered conformations, were found for wild-type and polymorphic P-gp. We hypothesize that the presence of a rare codon, marked by the synonymous polymorphism, affects the timing of cotranslational folding and insertion of P-gp into the membrane, thereby altering the structure of substrate and inhibitor interaction sites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kimchi-Sarfaty, Chava -- Oh, Jung Mi -- Kim, In-Wha -- Sauna, Zuben E -- Calcagno, Anna Maria -- Ambudkar, Suresh V -- Gottesman, Michael M -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2007 Jan 26;315(5811):525-8. Epub 2006 Dec 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA. kimchi@cber.fda.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17185560" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cell Membrane/metabolism ; Cercopithecus aethiops ; Codon ; Cyclosporine/pharmacology ; *Genes, MDR ; Haplotypes ; HeLa Cells ; Humans ; Mutagenesis, Site-Directed ; P-Glycoprotein/antagonists & inhibitors/*chemistry/genetics/*metabolism ; *Polymorphism, Single Nucleotide ; Protein Biosynthesis ; Protein Conformation ; *Protein Folding ; Protein Structure, Tertiary ; RNA, Messenger/genetics/metabolism ; Reverse Transcriptase Polymerase Chain Reaction ; Rhodamine 123/metabolism/pharmacology ; Sirolimus/pharmacology ; Substrate Specificity ; Transfection ; Verapamil/metabolism/pharmacology
    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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    BSKs mediate signal transduction from the receptor kinase BRI1 in Arabidopsis (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-07-26
    Description: Brassinosteroids (BRs) bind to the extracellular domain of the receptor kinase BRI1 to activate a signal transduction cascade that regulates nuclear gene expression and plant development. Many components of the BR signaling pathway have been identified and studied in detail. However, the substrate of BRI1 kinase that transduces the signal to downstream components remains unknown. Proteomic studies of plasma membrane proteins lead to the identification of three homologous BR-signaling kinases (BSK1, BSK2, and BSK3). The BSKs are phosphorylated by BRI1 in vitro and interact with BRI1 in vivo. Genetic and transgenic studies demonstrate that the BSKs represent a small family of kinases that activate BR signaling downstream of BRI1. These results demonstrate that BSKs are the substrates of BRI1 kinase that activate downstream BR signal transduction.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2730546/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2730546/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tang, Wenqiang -- Kim, Tae-Wuk -- Oses-Prieto, Juan A -- Sun, Yu -- Deng, Zhiping -- Zhu, Shengwei -- Wang, Ruiju -- Burlingame, Alma L -- Wang, Zhi-Yong -- R01 GM066258/GM/NIGMS NIH HHS/ -- R01 GM066258-07/GM/NIGMS NIH HHS/ -- R01GM066258/GM/NIGMS NIH HHS/ -- RR012961/RR/NCRR NIH HHS/ -- RR01614/RR/NCRR NIH HHS/ -- RR019934/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2008 Jul 25;321(5888):557-60. doi: 10.1126/science.1156973.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Biology, Carnegie Institution of Washington, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18653891" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/enzymology/genetics/*metabolism ; Arabidopsis Proteins/chemistry/genetics/*metabolism ; Brassinosteroids ; Cell Membrane/metabolism ; Cholestanols/metabolism/pharmacology ; Molecular Sequence Data ; Mutagenesis, Insertional ; Phosphorylation ; Plants, Genetically Modified ; Protein Kinases/chemistry/genetics/*metabolism ; Protein Structure, Tertiary ; Protein-Serine-Threonine Kinases ; Proteomics ; Recombinant Fusion Proteins/metabolism ; *Signal Transduction ; Steroids, Heterocyclic/metabolism/pharmacology
    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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