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Author

H. Pakrasi

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4 papers indexed here

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Review Oct 2026

Systems-level orchestration of oxygenic photosynthesis and nitrogen fixation in cyanobacteria

SUMMARY Diazotrophic cyanobacteria represent a unique group of prokaryotes that are capable of performing two physiologically conflicting processes: oxygen-generating photosynthesis and oxygen-sensitive nitrogen fixation. Adaptive evolution over millions of years has culminated in two complex, divergent strategies—spat...

A. Bandyopadhyay, M. Liberton, M. Bhattacharyya-Pakrasi et al. · 0 citations
Sep 2026

Inefficient Carotenoid-Mediated Quenching of Chlorophyll a Triplet: A Hypothetical Cause for the Evolution of Cys-Mediated Quenching in IsiA.

Iron-stress-induced protein A (IsiA) is a chlorophyll (Chl) a-containing protein in cyanobacteria. Under low-iron growth, it is the most abundant intracellular Chl a-binding protein. IsiA and the CP43 protein are suggested to have coevolved from a common ancestral protein, sharing similar spectroscopic properties. When...

D. Niedzwiedzki, S. Biswas, H. Pakrasi · 0 citations
Open access Sep 2026

Photosystem I structural fusion with IsiA enhances light-harvesting capabilities of filamentous cyanobacterium during iron deficiency

Analysis of energetic properties of gel-embedded supercomplexes demonstrated that excitation energy transfer in the IsiA-PsaL complex is highly efficient, suggesting enhanced efficiency may be a key factor underlying the downsizing of the IsiA-PSI assembly, which could compensate for the smaller size of the complex.

S. Biswas, D. Niedzwiedzki, Kuo-En Chen et al. · 0 citations
Open access Aug 2026

Antenna photosystem I remodeling in the iron stress–induced complex from Anabaena sp. PCC 7120

The structure and oligomeric states of the photosystem I–iron stress–induced protein A (PSI-IsiA) supercomplex from several species have been investigated using cryo–electron microscopy (cryo-EM) and atomic force microscopy. The cryo-EM structure of the PSI-IsiA complex from cyanobacterium Anabaena sp. PCC 7120 (7120)...

Ranel Maqdisi, D. Niedzwiedzki, Christopher A. Gorski et al. · 0 citations

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