Structural elucidation of selenocysteine insertion machinery of microalgal selenoprotein T and its transcriptional analysis

Abstract

Essential trace element selenium in association with selenoproteins, which is found in almost all organisms except higher plants and fungi, is involved in various biological functions. Advancement in the field of whole genome sequencing and data analyzing bioinformatic tools led to the accumulation of genome information of organisms. However, selenoproteins are unique and it needs specialized genomics tool for its identification as well as characterization. In this study, the presence of selenoprotein T (SelT) from Scenedesmus quadricauda was shown for the first time with experimental evidence and compared with SelT of marine microalgae Nannochloropsis oceanica. Along with SelT, all the associated machineries required to synthesize the selenoproteins were also identified. Also, the present study tried to explicate the evolutionary relatedness of SelT of these two organisms with other known bacteria and eukaryotes. Transcript level analysis in S. quadricauda under endoplasmic reticulum stress showed a 1.2 ± 0.28-fold increase in SelT expression. Thus, it provided the first experimental evidence on SelT expression from microalgae.

Green synthesis, characterization and functional validation of bio-transformed selenium nanoparticles

“…In addition, Se is also involved in the physiopathological conditions of many diseases, like anti-aging, cardiovascular, and cerebrovascular diseases [ 28 ]. Recently, our group decoded the selenium protein T and associated SECIS machinery from Microalgae [ 31 ]. We also developed a patented bioprocess to augment the bioconversion of organic selenium in an edible marine microalgae [ 29 ] and validated its applicability in the murine model [ 30 ].…”

Selenized lactic acid bacteria microencapsulated by spray drying: A promising strategy for beef cattle feed supplementation

“…Lactic acid bacteria (LAB), yeast, and microalgae possess the capability to metabolize inorganic selenium (Se), leading to the bioaccumulation of this element in various organic forms, including the bioavailable selenomethionine. [1][2][3][4] Compared to inorganic forms of Se, selenomethionine has been shown to exhibit lower toxicity and higher bioavailability. 3,5,6 Se deficiency in animals can lead to nutritional muscular dystrophy, 5,[7][8][9] characterized by muscular stiffness, weakness, and cardiac complications.…”