title: Proteome changes driven by phosphorus deficiency and recovery in the brown tide-forming alga Aureococcus anophagefferens.
abstract: Shotgun mass spectrometry was used to detect proteins in the harmful alga, Aureococcus anophagefferens, and monitor their relative abundance across nutrient replete (control), phosphate-deficient (-P) and -P refed with phosphate (P-refed) conditions. Spectral counting techniques identified differentially abundant proteins and demonstrated that under phosphate deficiency, A. anophagefferens increases proteins involved in both inorganic and organic phosphorus (P) scavenging, including a phosphate transporter, 5'-nucleotidase, and alkaline phosphatase. Additionally, an increase in abundance of a sulfolipid biosynthesis protein was detected in -P and P-refed conditions. Analysis of the polar membrane lipids showed that cellular concentrations of the sulfolipid sulphoquinovosyldiacylglycerol (SQDG) were nearly two-fold greater in the -P condition versus the control condition, while cellular phospholipids were approximately 8-fold less. Transcript and protein abundances were more tightly coupled for gene products involved in P metabolism compared to those involved in a range of other metabolic functions. Comparison of protein abundances between the -P and P-refed conditions identified differences in the timing of protein degradation and turnover. This suggests that culture studies examining nutrient starvation responses will be valuable in interpreting protein abundance patterns for cellular nutritional status and history in metaproteomic datasets.
authors.affiliation: Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, United States of America.
authors.forename: Louie L
authors.initials: LL
authors.lastname: Wurch
authors.forename: Erin M
authors.initials: EM
authors.lastname: Bertrand
authors.forename: Mak A
authors.initials: MA
authors.lastname: Saito
authors.forename: Benjamin A S
authors.initials: BA
authors.lastname: Van Mooy
authors.forename: Sonya T
authors.initials: ST
authors.lastname: Dyhrman
mesh_terms: D005786:Gene Expression Regulation / Q000187:drug effects; D000459:Phaeophyceae / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D028061:Phosphate Transport Proteins / Q000235:genetics / Q000378:metabolism; D010758:Phosphorus / Q000172:deficiency* / Q000494:pharmacology; D011506:Proteins / Q000378:metabolism; D020543:Proteome / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D059467:Transcriptome / Q000187:drug effects / Q000235:genetics; D014872:Water Movements
chemical_list: D028061:Phosphate Transport Proteins; D011506:Proteins; D020543:Proteome; D012333:RNA, Messenger; D010758:Phosphorus