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Title: Mouse fat storage‐inducing transmembrane protein 2 ( FIT 2) promotes lipid droplet accumulation in plants

Journal Article · · Plant Biotechnology Journal
DOI:https://doi.org/10.1111/pbi.12678· OSTI ID:1339585
 [1];  [1];  [1];  [2];  [2];  [2];  [3];  [3];  [1];  [2];  [3];  [1]
  1. Center for Plant Lipid Research University of North Texas Denton TX USA
  2. Department of Molecular and Cellular Biology University of Guelph Guelph ON Canada
  3. US Arid‐Land Agricultural Research Center USDA‐ARS Maricopa AZ USA

Summary Fat storage‐inducing transmembrane protein 2 ( FIT 2) is an endoplasmic reticulum ( ER )‐localized protein that plays an important role in lipid droplet ( LD ) formation in animal cells. However, no obvious homologue of FIT 2 is found in plants. Here, we tested the function of FIT 2 in plant cells by ectopically expressing mouse ( Mus musculus ) FIT 2 in Nicotiana tabacum suspension‐cultured cells, Nicotiana benthamiana leaves and Arabidopsis thaliana plants. Confocal microscopy indicated that the expression of FIT 2 dramatically increased the number and size of LD s in leaves of N. benthamiana and Arabidopsis, and lipidomics analysis and mass spectrometry imaging confirmed the accumulation of neutral lipids in leaves. FIT 2 also increased seed oil content by ~13% in some stable, overexpressing lines of Arabidopsis . When expressed transiently in leaves of N. benthamiana or suspension cells of N. tabacum , FIT 2 localized specifically to the ER and was often concentrated at certain regions of the ER that resembled ER ‐ LD junction sites. FIT 2 also colocalized at the ER with other proteins known to be involved in triacylglycerol biosynthesis or LD formation in plants, but not with ER resident proteins involved in electron transfer or ER ‐vesicle exit sites. Collectively, these results demonstrate that mouse FIT 2 promotes LD accumulation in plants, a surprising functional conservation in the context of a plant cell given the apparent lack of FIT 2 homologues in higher plants. These results suggest also that FIT 2 expression represents an effective synthetic biology strategy for elaborating neutral lipid compartments in plant tissues for potential biofuel or bioproduct purposes.

Research Organization:
Univ. of North Texas, Denton, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Natural Sciences and Engineering Research Council of Canada (NSERC)
Grant/Contract Number:
DE‐SC0016536; SC0016536; FG02-09ER64812
OSTI ID:
1339585
Alternate ID(s):
OSTI ID: 1339586; OSTI ID: 1374537
Journal Information:
Plant Biotechnology Journal, Journal Name: Plant Biotechnology Journal Vol. 15 Journal Issue: 7; ISSN 1467-7644
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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