FN Archimer Export Format
PT J
TI How haptophytes microalgae mitigate vitamin B-12 limitation
BT 
AF NEF, Charlotte
   JUNG, Sebastien
   MAIRET, Francis
   KAAS, Raymond
   GRIZEAU, Dominique
   GARNIER, Matthieu
AS 1:1;2:1;3:1;4:1;5:2;6:1;
FF 1:PDG-RBE-BRM-LPBA;2:;3:PDG-RBE-BRM-LPBA;4:PDG-RBE-BRM-LPBA;5:;6:PDG-RBE-BRM-LPBA;
C1 IFREMER, Physiol & Biotechnol Algae Lab, Rue Ile Yeu, F-44311 Nantes, France.
   Univ Nantes, CNRS, GEPEA, F-44602 St Nazaire, France.
C2 IFREMER, FRANCE
   UNIV NANTES, FRANCE
SI NANTES
SE PDG-RBE-BRM-LPBA
IN WOS Ifremer UPR
   DOAJ
   copubli-france
   copubli-univ-france
IF 3.998
TC 16
UR https://archimer.ifremer.fr/doc/00504/61523/65398.pdf
   https://archimer.ifremer.fr/doc/00504/61523/65399.xlsx
   https://archimer.ifremer.fr/doc/00504/61523/65400.xlsx
   https://archimer.ifremer.fr/doc/00504/61523/65401.pdf
LA English
DT Article
AB Vitamin B-12 (cobalamin) can control phytoplankton development and community composition, with around half of microalgal species requiring this vitamin for growth. B-12 dependency is determined by the absence of cobalamin-independent methionine synthase and is unrelated across lineages. Despite their important role in carbon and sulphur biogeochemistry, little is known about haptophytes utilization of vitamin B-12 and their ability to cope with its limitation. Here we report the first evaluation of B-12 auxotrophy among this lineage based on molecular data of 19 species from 9 families. We assume that all species encode only a B-12-dependent methionine synthase, suggesting ubiquitous B-12 auxotrophy in this phylum. We further address the effect of different B-12 limitations on the molecular physiology of the model haptophyte Tisochrysis lutea. By coupling growth assays in batch and chemostat to cobalamin quantification and expression analyses, we propose that haptophytes use three strategies to cope with B-12 limitation. Haptophytes may assimilate dissolved methionine, finely regulate genes involved in methionine cycle and B-12 transport and/or limit B-12 transport to the mitochondrion. Taken together, these results provide better understanding of B-12 metabolism in haptophytes and represent valuable data for deciphering how B-12-producing bacteria shape the structure and dynamics of this important phytoplankton community. 
PY 2019
PD JUL
SO Scientific Reports
SN 2045-2322
PU Nature Publishing Group
VL 9
IS 8417
UT 000470847700014
DI 10.1038/s41598-019-44797-W
ID 61523
ER

EF