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- W1768395344 endingPage "635" @default.
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- W1768395344 abstract "In Pseudomonas sp. strain M114, the outer membrane receptor for ferric pseudobactin M114 was shown to transport ferric pseudobactins B10 and A225, in addition to its own. The gene encoding this receptor, which was previously cloned on pCUP3, was localized by Tn 5 mutagenesis to a region comprising >1.6 kb of M114 DNA. A mutant (strain M114R1) lacking this receptor was then created by a marker exchange technique. Characterization of this mutant by using purified pseudobactin M114 in radiolabeled ferric iron uptake studies confirmed that it was completely unable to utilize this siderophore for acquisition of iron. In addition, it lacked an outer membrane protein band of 89 kDa when subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis. As a result, growth of the mutant was severely restricted under low-iron conditions. However, this phenotype was reversed in the presence of another fluorescent siderophore (pseudobactin MT3A) from Pseudomonas sp. strain MT3A, suggesting the presence of a second receptor in strain M114. Furthermore, wild-type Pseudomonas sp. strain B24 was not able to utilize ferric pseudobactin MT3A, and this phenotype was not reversed upon expression of the M114 receptor encoded on pCUP3. However, a cosmid clone (pMS1047) that enabled strain B24 to utilize ferric pseudobactin MT3A was isolated from an M114 gene bank. Radiolabel transport assays with purified pseudobactin MT3A confirmed this event. Plasmid pMS1047 was shown to encode an outer membrane protein of 81 kDa in strain B24 under iron-limiting conditions; this protein corresponds to a similar protein in strain M114." @default.
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- W1768395344 date "1992-02-01" @default.
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- W1768395344 title "Characterization of Fluorescent Siderophore-Mediated Iron Uptake in <i>Pseudomonas</i> sp. Strain M114: Evidence for the Existence of an Additional Ferric Siderophore Receptor" @default.
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- W1768395344 doi "https://doi.org/10.1128/aem.58.2.630-635.1992" @default.
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