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Title: Identifying Aspects of the Post-Transcriptional Program Governing the Proteome of the Green Alga Micromonas pusilla

Journal Article · · PLoS ONE
 [1];  [2];  [2];  [3];  [3];  [2];  [4];  [4];  [3];  [3];  [1];  [5];  [6]
  1. Univ. of California, Santa Cruz, CA (United States)
  2. Monterey Bay Aquarium Research Inst., Moss Landing, CA (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  4. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  5. Monterey Bay Aquarium Research Inst., Moss Landing, CA (United States); Univ. of California, Santa Cruz, CA (United States); Canadian Inst. for Advanced Research, Toronto (Canada)
  6. Queen's Univ., Belfast, Northern Ireland (United Kingdom)

Micromonas is a unicellular green alga that belongs to the prasinophytes, a sister lineage to land plants. This picoeukaryotic (<2 μm diameter) alga is widespread in the marine environment but still not understood at the cellular level. Here, we examine the mRNA and protein level changes that take place over the course of the day-night cycle using mid-exponential nutrient replete cultures of Micromonas pusilla CCMP1545 grown and analyzed in biological triplicate. During the experiment, samples were collected at key transition points during the diel for evaluation using high-throughput LC-MS proteomics. We also sequenced matched mRNA samples from the same time points, using pair-ended directional Illumina RNA-Seq to investigate the dynamics and relationship between the mRNA and protein expression programs of M. pusilla. Similar to a prior study of the marine cyanobacterium Prochlorococcus, we found significant divergence in the mRNA and proteomics expression dynamics in response to the light:dark cycle. Additionally, expressional responses of genes and the proteins they encoded could also be variable within the same metabolic pathway, such as the oxygenic photosynthesis pathway. A regression framework was used to predict protein levels using both mRNA expression and gene-specific sequence-based features. Several features in the genome sequence were found to influence protein abundance including the codon usage and the length of the 3’ UTR. Collectively, our studies provide insights into the regulation of the proteome over a diel as relationships between the transcriptional and translational programs in the widespread marine green alga Micromonas.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1342328
Report Number(s):
PNNL-SA-115265; 47672; KP1601030
Journal Information:
PLoS ONE, Vol. 11, Issue 7; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (3)

Specialized proteomic responses and an ancient photoprotection mechanism sustain marine green algal growth during phosphate limitation journal June 2018
Spatial Variability of Picoeukaryotic Communities in the Mariana Trench journal October 2018
Responses of the picoprasinophyte Micromonas commoda to light and ultraviolet stress journal March 2017