The properties of Slr1944 protein encoded by the slr1944 gene and participating in the metabolism of lipophilic compounds in a cyanobacterium Synechocystis were under study. Located in the periplasm, this protein comprises a conserved pentapeptide G-X-S-X-G characteristic of lipases, acetylcholinesterases, and thioesterases. An attempt to delete the gene from the cyanobacterial genome failed; this fact presumes an essential function of Slr1944 protein under the optimum growth conditions. Expression of the slr1944 gene in Escherichia coli cells demonstrated a high affinity of the product for lipophilic compounds. An enhanced slr1944 expression deprived Synechocystis cells of the ability to restore the activity of the photosynthetic electron-transport chain following photoinactivation. The authors believe that Slr1944 participates in the biogenesis of the lipophilic components of photosynthetic complexes.
Russian Journal of Plant Physiology – Springer Journals
Published: Dec 23, 2004
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