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Science 18 February 2000:
Vol. 287. no. 5456, pp. 1245 - 1247
DOI: 10.1126/science.287.5456.1245
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Reports
Self-Assembling Amphiphilic Siderophores from Marine Bacteria
J. S. Martinez,
1
G. P. Zhang,
1
P. D. Holt,
1
H.-T. Jung,
2
C. J. Carrano,
3
M. G. Haygood,
4
Alison Butler
1*
Most aerobic bacteria secrete siderophores to facilitate
iron acquisition. Two families of siderophores were isolated from strains belonging to two different genera of marine bacteria. The
aquachelins, from Halomonas aquamarina strain DS40M3, and the marinobactins, from Marinobacter sp. strains DS40M6 and
DS40M8, each contain a unique peptidic head group that coordinates
iron(III) and an appendage of one of a series of fatty acid moieties.
These siderophores have low critical micelle concentrations (CMCs). In
the absence of iron, the marinobactins are present as micelles at
concentrations exceeding their CMC; upon addition of iron(III), the
micelles undergo a spontaneous phase change to form vesicles. These
observations suggest that unique iron acquisition mechanisms may have
evolved in marine bacteria.
1 Department of Chemistry and Biochemistry,
University of California, Santa Barbara, CA 93106-9510, USA.
2 Department of Chemical Engineering, University of
California, Santa Barbara, CA 93106, USA.
3 Department of Chemistry, Southwest Texas State
University, San Marcos, TX 78666, USA.
4 Marine
Biology Research Division, Scripps Institution of Oceanography,
University of California, San Diego, La Jolla, CA 92093-0202, USA.
*
To whom correspondence should be addressed. E-mail:
Butler{at}chem.ucsb.edu
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