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231223s2005 xx ||||| 00| ||eng c |
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|a pubmed25n0532.xml
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|a (NLM)16342981
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Owen, Tate
|e verfasserin
|4 aut
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| 245 |
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|a Micelle-to-vesicle transition of an iron-chelating microbial surfactant, marinobactin E
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|c 2005
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 19.07.2007
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|a Date Revised 03.12.2007
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|a published: Print
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|a Citation Status MEDLINE
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|a Small-angle neutron scattering (SANS) and dynamic light scattering (DLS) techniques have been applied to study the self-assembly processes of a microbially produced siderophore, marinobactin E (ME). ME is one of a series of marinobactins A-E that facilitate Fe(III) acquisition by the source bacterium through coordination of Fe(III) by the marinobactin headgroup. ME is a six-amino-acid peptide amphiphile appended by palmitic acid (C16), and differs only in the nature of the fatty acid moiety from the other marinobactins. Apo-ME (uncoordinated ME) assembles to form micelles with an average diameter of 4.0 nm. Upon coordination of one equivalent of Fe(III), the mean micellar diameter of Fe(III)-ME shrinks to approximately 2.8 nm. However, in the presence of excess Fe(III), Fe(III)-ME undergoes a micelle-to-vesicle transition (MVT). At a small excess of Fe(III) over Fe(III)-ME (i.e., <1.2 Fe(III)/ME), a fraction of the Fe(III)-ME micelles rearrange into approximately 200 nm diameter unilamellar vesicles. At even greater Fe(III)/ME ratios (e.g., 2-3) multilamellar aggregates begin to emerge, consistent with either multilamellar vesicles or lamellar stacks. The MVT exhibited by ME may represent a unique mechanism by which marine bacteria may detect and sequester iron required for growth
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|a Journal Article
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|a Research Support, N.I.H., Extramural
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Iron Chelating Agents
|2 NLM
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|a Micelles
|2 NLM
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|a Oligopeptides
|2 NLM
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|a Palmitic Acids
|2 NLM
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| 650 |
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|a Surface-Active Agents
|2 NLM
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| 650 |
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|a marinobactin E
|2 NLM
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|a Pynn, Roger
|e verfasserin
|4 aut
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1 |
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|a Martinez, Jennifer S
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Butler, Alison
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1991
|g 21(2005), 26 vom: 20. Dez., Seite 12109-14
|w (DE-627)NLM098181009
|x 0743-7463
|7 nnns
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| 773 |
1 |
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|g volume:21
|g year:2005
|g number:26
|g day:20
|g month:12
|g pages:12109-14
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