Identification of proteins involved in transcription/translation (eEF 1A1) as an inhibitor of Bax induced apoptosis

Abstract

Eukaryotic elongation factor 1A1 (eEF1A1) is central to translational activity. It is involved in complexes that form signal transduction with protein kinase C, as well as being a signal transducer and activator of transcription 3. eEF1A1 and eEF1A2 are isoforms of the alpha subunit of elongating factor 1 complex. It has been reported that eEF1A1 is expressed in most human tissues but the brain, skeletal muscle and heart. eEF1A1 has been linked to both apoptosis and anti-apoptotic activities. In this study, eEF1A1 was co-expressed with Bax, a proapoptotic protein via heterologous expression of recombinant DNA in yeast cells. Assays were carried out to monitor the fate and state of yeast cells when eEF1A1 was co-expressed with Bax. The yeast strain (bearing an integrated copy of the Bax gene) was transformed with an episomal 2-micron plasmid that encodes HA-tagged eEF1A1 gene. The resultant strain would allow co-expression of Bax and eEF1A1 in yeast cells, Bax being under the control of the GAL1 promoter, while the PGK1 promoter drives eEF1A1 expression. Bcl 2A1, a known anti-apoptotic protein, was also co-expressed with Bax in yeast cells as a positive control, to study the anti-apoptotic characteristic of eEF-1A1. The part eEF1A1 plays in apoptosis has been contentious, amidst the pro and anti-apoptotic properties of eEF1A1, it was shown clearly, in this study that eEF1A1 portrays only anti-apoptotic property in the presence of pro-apoptotic protein, Bax.

MLIF Modulates Microglia Polarization in Ischemic Stroke by Targeting eEF1A1

“…However, eEF1A2 is expressed in a tissue-specific manner, and eEF1A is expressed ubiquitously ( Li et al, 2019 ). In addition to its roles in polypeptide chain elongation, the noncanonical functions of eEF1A1 have become a focus recently, such as apoptosis ( Akintade and Chaudhuri, 2020 ), virus infection ( White et al, 2021 ), signal transduction ( Akintade and Chaudhuri, 2020 ), and tumorigenesis ( Liu S. et al, 2019 ). Our previous study indicated that MLIF decreased the ICAM-1 and VCAM-1 expression and increased the eNOS expression in OGD- or ox-LDL–induced bEnd3 cells by targeting eEF1A1 ( Zhang et al, 2012 ).…”

Unmasking of molecular players: Proteomic profiling of vitreous humor in pathologic myopia

“…The role of EEF1A1 in apoptosis has been controversial. EEF1A1 seems to promote apoptosis, while a previous study showed that EEF1A1 only exhibits antiapoptotic effects when the proapoptotic protein Bax is present [21]. Our prior research revealed that cell apoptosis is an important contributor to the onset and progression of myopia.…”

EEF1A1 knock-down regulates the expression and alternative splicing of genes associated with Parkinson`s disease in U251 cells

“…In mammals, EEF1A is divided into EEF1A1 and EEF1A2 [6]. Studies have reported that EEF1A1 is involved in apoptosis [7], viral infection [8],…”

“…signal transduction [7], and tumorigenesis [9]. Liu et al [10] found that down-regulation of EEF1A1 inhibited OGD-induced activation of the JNK pathway and thus inhibited apoptosis, which had a protective effect similar to that of HSC70 in cerebral ischemic injury.…”