title: Cadmium toxicity in diazotrophic Anabaena spp. adjudged by hasty up-accumulation of transporter and signaling and severe down-accumulation of nitrogen metabolism proteins.
abstract: Present study demonstrates interspecies variation in proteome and survival strategy of three Anabaena species i.e., Anabaena L31, Anabaena sp. PCC 7120 and Anabaena doliolum subjected to respective LC50 doses of Cd at 0, 1, 3, 5 and 7day intervals. The proteome coverage with 452 differentially accumulated proteins unveiled species and time specific expression and interaction network of proteins involved in important cellular functions. Statistical analysis of protein abundance across Cd-treated proteomes clustered their co-expression pattern into four groups viz., (i) early (days 1 and 3) accumulated proteins, (ii) proteins up-accumulated for longer duration, (iii) late (days 5 and 7) accumulated proteins, and (iv) mostly down-accumulated proteins. Appreciable growth of Cd treated A L31 over other two species may be ascribed to proteins contained in the first and second groups (belonging to energy and carbohydrate metabolism (TK, G6-PI, PGD, FBA, PPA, ATP synthase)), sulfur metabolism (GR, GST, PGDH, PAPS reductase, GDC-P, and SAM synthetase), fatty acid metabolism (AspD, PspA, SQD-1), phosphorous metabolism (PhoD, PstB and SQD1), molecular chaperones (Gro-EL, FKBP-type peptidylprolyl isomerase), and antioxidative defense enzymes (SOD-A, catalase). Anabaena sp. PCC 7120 harboring proteins largely from the third group qualified as a late accumulator and A. doliolum housing majority of proteins from the fourth group emerged as the most sensitive species. Thus early up-accumulation of transporter and signaling category proteins and drastic reduction of nitrogen assimilation proteins could be taken as a vital indicator of cadmium toxicity in Anabaena spp. This article is part of a Special Issue entitled: Proteomics in India.
authors.affiliation: Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Prashant Kumar
authors.initials: PK
authors.lastname: Singh
authors.affiliation: Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Alok Kumar
authors.initials: AK
authors.lastname: Shrivastava
authors.affiliation: Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Antra
authors.initials: A
authors.lastname: Chatterjee
authors.affiliation: Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Sarita
authors.initials: S
authors.lastname: Pandey
authors.affiliation: Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Snigdha
authors.initials: S
authors.lastname: Rai
authors.affiliation: Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Shilpi
authors.initials: S
authors.lastname: Singh
authors.affiliation: Molecular Biology Section, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India. Electronic address: lcrbhu15@gmail.com.
authors.forename: L C
authors.initials: LC
authors.lastname: Rai
mesh_terms: D017033:Anabaena / Q000378:metabolism*; D002104:Cadmium / Q000494:pharmacology*; D002352:Carrier Proteins / Q000096:biosynthesis*; D015536:Down-Regulation / Q000187:drug effects*; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects*; D009584:Nitrogen / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects*
chemical_list: D002352:Carrier Proteins; D002104:Cadmium; D009584:Nitrogen
keywords: Anabaena; Cd; Cd responsive proteins; Diazotrophs; Heat map; MALDI-TOF MS/MS; Proteomics; SOTA-clustering; Two-dimensional gel electrophoresis