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Outer membrane protein I is associated with poly-β-hydroxybutyrate granules and is necessary for optimal polymer accumulation in Azotobacter vinelandii on solid medium
is a soil bacterium that is able to synthesize poly-β-hydroxybutyrate (PHB), a polymer used to produce biodegradable plastic. PHB is stored in the cytoplasm as granules surrounded by several proteins such as the major phasin PhbP, PHB synthase and PHB depolymerase, among others. Many studies have re...
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Published in: | Microbiology (Society for General Microbiology) 2019-10, Vol.165 (10), p.1107-1116 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | is a soil bacterium that is able to synthesize poly-β-hydroxybutyrate (PHB), a polymer used to produce biodegradable plastic. PHB is stored in the cytoplasm as granules surrounded by several proteins such as the major phasin PhbP, PHB synthase and PHB depolymerase, among others. Many studies have reported the presence of membrane proteins on PHB granules due to contamination during the polymer extraction procedures. Previously, the outer membrane protein I (OprI) was detected on the polymer granules in
. In this study, by using random transposon mutagenesis, we identified that a mutation in the
gene diminished PHB accumulation in
on solid medium. Electron microscopy confirmed the low polymer production by the
mutant. Analysis of PHB granules by Tricine-SDS-PAGE revealed that the absence of OprI affected the protein profile of the granules, suggesting that OprI could have a structural role in
. Thus, some membrane proteins on PHB granules may not be artefacts as previously described. |
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ISSN: | 1350-0872 1465-2080 |
DOI: | 10.1099/mic.0.000837 |