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Ferredoxin and flavodoxin in eastern Antarctica pack ice
Citation
Pankowski, A and McMinn, A, Ferredoxin and flavodoxin in eastern Antarctica pack ice, Polar Biology, 31, (10) pp. 1153-1165. ISSN 0722-4060 (2008) [Refereed Article]
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Copyright Statement
The original publication is available at www.springerlink.com
Official URL: http://www.springerlink.com
DOI: doi:10.1007/s00300-008-0451-y
Abstract
The presence, concentration and distribution of
the iron regulated proteins, ferredoxin and Xavodoxin, was
investigated in pack ice oV eastern Antarctica using SDSPAGE
gels. Bands corresponding to ferredoxin and/or
Xavodoxin were observed in all but eight of the 102 core
sections analysed. Flavodoxin was found in most of the ice
samples and was strongly correlated with chlorophyll a
standing stock. The widespread distribution of Xavodoxin
here is not thought to indicate iron-limitation as many of
the dominant species, such as Fragilariopsis cylindrus,
Cylindrotheca closterium, are known to produce this protein
under iron-replete conditions and thus the signiWcant
correlation between Xavodoxin and biomass is likely to be
the result of widespread constitutive Xavodoxin expression
among the diatoms that commonly inhabit sea ice. High
concentrations of ferredoxin were predominantly derived
from core sections on the Xoes closest to the continent and
also in the upper portion of these Xoes. There was a consistent
lack of ferredoxin expression in the high biomass bottom
communities. The absence of ferredoxin is likely to
indicate a reduced supply of iron but the signiWcance of this
reduced iron supply cannot be inferred on the basis of protein
expression alone. Furthermore, in the present study the
observed variability in the Xavodoxin:ferredoxin ratio may
not simply reXect the iron nutritional status of the community,
but probably results from changes in the abundance of
species capable of expressing ferredoxin.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | Iron · Antarctica · Pack ice · Ferredoxin · Flavodoxin |
| Research Division: | Biological Sciences |
| Research Group: | Ecology |
| Research Field: | Marine and Estuarine Ecology (incl. Marine Ichthyology) |
| Objective Division: | Environment |
| Objective Group: | Ecosystem Assessment and Management |
| Objective Field: | Ecosystem Assessment and Management of Marine Environments |
| Author: | Pankowski, A (Mr Andrew Pankowski) |
| Author: | McMinn, A (Professor Andrew McMinn) |
| ID Code: | 54419 |
| Year Published: | 2008 |
| Web of Science® Times Cited: | 5 |
| Deposited By: | IASOS |
| Deposited On: | 2009-02-19 |
| Last Modified: | 2009-06-03 |
| Downloads: | 2 View Download Statistics |
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