Novel Porin genes and modes of Porin regulation in <em>Salmonella typhi</em>
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چکیده
منابع مشابه
Novel mechanism of Escherichia coli porin regulation.
A novel mechanism of Escherichia coli porin regulation was discovered from multicopy suppressors that permitted growth of cells expressing a mutant OmpC protein in the absence of DegP. Analyses of two suppressors showed that both substantially lowered OmpC expression. Suppression activities were confined to a short DNA sequence, which we designated ipeX for inhibition of porin expression, and t...
متن کاملStructure and function of the porin channel.
The outer membrane bilayer of gram-negative bacteria, which encapsulates completely the plasma membrane, seems to act as a protection system against noxious macromolecules like proteases and bile-salt micelles [1]. The external monolayer is composed of lipopolysaccharides with a variable carbohydrat.e composi~i?n. Long oligosaccharide chains protect the cells agamst recogmtlOn by the complement...
متن کاملThe oligogalacturonate-specific porin KdgM of Erwinia chrysanthemi belongs to a new porin family.
The phytopathogenic Gram-negative bacteria Erwinia chrysanthemi secretes pectinases, which are able to degrade the pectic polymers of plant cell walls, and uses the degradation products as a carbon source for growth. We characterized a major outer membrane protein, KdgM, whose synthesis is strongly induced in the presence of pectic derivatives. The corresponding gene was characterized. Analysis...
متن کاملCharacterization of SH groups in porin of bovine heart mitochondria. Porin cysteines are localized in the channel walls.
Porin from bovine heart mitochondria contains probably two cysteines (Cys126 and Cys230 in human porin, Kayser, H., Kratzin, H. D., Thinnes, F. P., Götz, H., Schmidt, W. E., Eckart, K. & Hilschmann, N. (1989) Biol. Chem. Hoppe-Seyler 370, 1265-1278). Reduced and oxidized forms of these cysteines were investigated in purified protein and in intact mitochondria using the agents dithioerythritol, ...
متن کاملHeterologous expression of Escherichia coli porin genes in Salmonella typhi Ty2: regulation by medium osmolarity, temperature and oxygen availability.
Electrophoretic analysis of outer membrane proteins showed that Salmonella typhi OmpC expression is not reciprocally regulated relative to OmpF as described for Escherichia coli and S. typhimurium. When bacteria were grown in minimal media, both OmpC and OmpF were repressed as the osmolarity increased. However, in Luria broth, expression of OmpC was slightly induced by osmolarity up to 0.3 osmM...
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ژورنال
عنوان ژورنال: Medical Journal of Indonesia
سال: 1998
ISSN: 2252-8083,0853-1773
DOI: 10.13181/mji.v7isupp1.1027