Helicobacter pylori Physiology Predicted from Genomic Comparison of Two Strains
| Autor: | Peter Doig, Trevor J. Trust, Gilles Carmel, Peter J. Tummino, Boudewijn L. M. de Jonge, Scott D. Mills, Brian Noonan, Eric D. Brown, Maria Uria-Nickelsen, Braydon C. Guild, Richard A. Alm, Gerald F. Vovis, Donald T. Moir |
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| Rok vydání: | 1999 |
| Předmět: |
Genetics
Phase variation Helicobacter pylori biology Sulfur metabolism Physiology Metabolism biology.organism_classification Microbiology Article Helicobacter Infections Transformation (genetics) Infectious Diseases Bacterial Proteins Genes Bacterial Humans Energy Metabolism Bacterial outer membrane Molecular Biology Genome Bacterial Bacteria Genomic organization |
| Zdroj: | Microbiology and Molecular Biology Reviews. 63:675-707 |
| ISSN: | 1098-5557 1092-2172 |
| Popis: | SUMMARY Helicobacter pylori is a gram-negative bacteria which colonizes the gastric mucosa of humans and is implicated in a wide range of gastroduodenal diseases. This paper reviews the physiology of this bacterium as predicted from the sequenced genomes of two unrelated strains and reconciles these predictions with the literature. In general, the predicted capabilities are in good agreement with reported experimental observations. H. pylori is limited in carbohydrate utilization and will use amino acids, for which it has transporter systems, as sources of carbon. Energy can be generated by fermentation, and the bacterium possesses components necessary for both aerobic and anaerobic respiration. Sulfur metabolism is limited, whereas nitrogen metabolism is extensive. There is active uptake of DNA via transformation and ample restriction-modification activities. The cell contains numerous outer membrane proteins, some of which are porins or involved in iron uptake. Some of these outer membrane proteins and the lipopolysaccharide may be regulated by a slipped-strand repair mechanism which probably results in phase variation and plays a role in colonization. In contrast to a commonly held belief that H. pylori is a very diverse species, few differences were predicted in the physiology of these two unrelated strains, indicating that host and environmental factors probably play a significant role in the outocme of H. pylori-related disease. |
| Databáze: | OpenAIRE |
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