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Acute cadmium toxicity and post-stress recovery: Insights into coordinated and integrated response/recovery strategies of Anabaena sp. PCC 7120
Banaras Hindu Univ, Inst Sci, Dept Bot, Ctr Adv Study Bot, Varanasi 221005, Uttar Pradesh, India..
Banaras Hindu Univ, Inst Sci, Dept Bot, Ctr Adv Study Bot, Varanasi 221005, Uttar Pradesh, India..
Banaras Hindu Univ, Inst Sci, Dept Bot, Ctr Adv Study Bot, Varanasi 221005, Uttar Pradesh, India..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Glycoscience. AlbaNova Univ Ctr.ORCID iD: 0000-0003-3514-8999
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2021 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 411, article id 124822Article in journal (Refereed) Published
Abstract [en]

Cyanobacteria, the first photoautotrophs have remarkable adaptive capabilities against most abiotic stresses, including Cd. A model cyanobacterium, Anabaena sp. PCC 7120 has been commonly used to understand cyanobacterial plasticity under different environmental stresses. However, very few studies have focused on the acute Cd toxicity. In this context, Anabaena was subjected to 100 ?M Cd for 48 h (acute Cd stress, ACdS) and then transferred into the fresh medium for post-stress recovery (PSR). We further investigated the dynamics of morpho-ultrastructure, physiology, cytosolic proteome, thylakoidal complexes, chelators, and transporters after ACdS, as well as during early (ER), mid (MR), and late (LR) phases of PSR. The findings revealed that ACdS induced intracellular Cd accumulation and ROS production, altered morpho-ultrastructure, reduced photosynthetic pigments, and affected the structural organization of PSII, which subsequently hindered photosynthetic efficiency. Anabaena responded to ACdS and recovered during PSR by reprogramming the expression pattern of proteins/genes involved in cellular defense and repair; CO2 access, Calvin-Benson cycle, glycolysis, and pentose phosphate pathway; protein biosynthesis, folding, and degradation; regulatory functions; PSI-based cyclic electron flow; Cd chelation; and efflux. These modulations occurred in an integrated and coordinated manner that facilitated Anabaena to detoxify Cd and repair ACdS-induced cellular damage.

Place, publisher, year, edition, pages
Elsevier BV , 2021. Vol. 411, article id 124822
Keywords [en]
Acute Cd stress, BN-SDS PAGE, Cd chelators and efflux transporters, Cyclic electron flow, IEF-SDS PAGE
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:kth:diva-295380DOI: 10.1016/j.jhazmat.2020.124822ISI: 000638083500006PubMedID: 33858073Scopus ID: 2-s2.0-85100446665OAI: oai:DiVA.org:kth-295380DiVA, id: diva2:1556723
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QC 20210524

Available from: 2021-05-24 Created: 2021-05-24 Last updated: 2022-06-25Bibliographically approved

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Kumar, SanjivSrivastava, Vaibhav

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