Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Entire DC Network
Isolation And Expression Of A Gene Cluster Responsible For Biosynthesis Of The Glycopeptidolipid Antigens Of Micobacterium Avium, John T. Belisle, Lisa Pascopella, Julia M. Inamine, Patrick J. Brennan, William R. Jacobs Jr.
Isolation And Expression Of A Gene Cluster Responsible For Biosynthesis Of The Glycopeptidolipid Antigens Of Micobacterium Avium, John T. Belisle, Lisa Pascopella, Julia M. Inamine, Patrick J. Brennan, William R. Jacobs Jr.
Public and Community Health Sciences Faculty Publications
Bacteria within the Mycobacterium avium complex are prominent in the environment and are a source of serious disseminated infections in patients with AIDS. Serovars of the M. avium complex are distinguished from all other mycobacteria and from one another by the presence of highly antigenic glycolipids, the glycopeptidolipids, on their surfaces. A genomic library of DNA from serovar 2 of the M. avium complex was constructed in the Escherichia coli-Mycobacterium shuttle cosmid, pYUB18, and used to clone and express in Mycobacterium smegmatis the genes responsible for the biosynthesis of the oligosaccharide segment of the M. avium serovar 2-specific glycopeptidolipid. The …
Interaction Between Tetraethylammonium And Amino Acid Residues In The Pore Of Cloned Voltage-Dependent Potassium Channels, Michael Kavanaugh, Michael D. Varnum, Peregrine B. Osborne, Macdonald J. Christie, Andreas E. Busch, John P. Adelman, R. Alan North
Interaction Between Tetraethylammonium And Amino Acid Residues In The Pore Of Cloned Voltage-Dependent Potassium Channels, Michael Kavanaugh, Michael D. Varnum, Peregrine B. Osborne, Macdonald J. Christie, Andreas E. Busch, John P. Adelman, R. Alan North
Biomedical and Pharmaceutical Sciences Faculty Publications
Extracellular tetraethylammonium (TEA) inhibits currents in Xenopus oocytes that have been injected with mRNAs encoding voltage-dependent potassium channels. Concentration-response curves were used to measure the affinity of TEA; this differed up to 700-fold among channels RBK1 (KD 0.3 mM), RGK5 (KD 11 mM), and RBK2 (KD greater than 200 mM). Studies in which chimeric channels were expressed localized TEA binding to the putative extracellular loop between trans-membrane domains S5 and S6. Site-directed mutagenesis of residues in this region identified the residue Tyr379 of RBK1 as a crucial determinant of TEA sensitivity; substitution of Tyr in the equivalent positions of RBK2 …