Background: Due to high genetic variation in human leukocyte antigen )HLA( alleles, epitope-based vaccines don’t show equal efficacy in different human populations. therefore, we proposed a multi-epitope vaccine against SARS-CoV-2 for Iranian populations. Materials and Methods: For this purpose, the proteins without allergenicity and high antigenicity as well as conservancy level from SARS-CoV...

Single-chain antibodies are genetically engineered constructs composed of a VH and VL domain of an antibody linked by a flexible peptide linker, commonly (GGGGS)3. We asked whether replacement of this flexible linker with peptides known to undergo environmentally induced structural transitions could lead to antibodies with controlled binding and release characteristics. To this end, we genetica...

The cellular heterogeneity of the brain confounds efforts to elucidate the biological properties of distinct neuronal populations. Using bacterial artificial chromosome (BAC) transgenic mice that express EGFP-tagged ribosomal protein L10a in defined cell populations, we have developed a methodology for affinity purification of polysomal mRNAs from genetically defined cell populations in the bra...

Cis-regulatory elements (CREs) are commonly recognized by correlative chromatin features, yet the molecular composition of the vast majority of CREs in chromatin remains unknown. Here, we describe a CRISPR affinity purification in situ of regulatory elements (CAPTURE) approach to unbiasedly identify locus-specific chromatin-regulating protein complexes and long-range DNA interactions. Using an ...

In Mycoplasma pneumoniae and several other mollicutes, the UGA opal codon specifies tryptophan rather than a translation stop. This often makes it difficult to express Mycoplasma proteins in heterologous hosts. In this work, we demonstrate that mollicute proteins can be fused to an affinity tag and be expressed directly in M. pneumoniae. The protein can then be purified by affinity chromatograp...

A key aspect of eukaryotic gene expression is the coupling of transcription with RNA processing, polyadenylation and export. The use of new techniques based on tandem affinity purification (TAP) and chromatin immunoprecipitation (ChIP), and of genetic and cell biology approaches has contributed to the beginning of deciphering the network of protein-mRNA interactions accompanying this coupling. ...

The Escherichia coli RecB protein, normally synthesized in low amounts, has been amplified by linkage of the recB gene to the phage lambda leftward promoter in an expression plasmid. From strains harboring this plasmid, RecB protein has been purified to homogeneity by a simple procedure which includes affinity chromatography on a column of RecC protein bound to agarose. The purified RecB protei...

We have used protein-blotting and protein affinity chromatography to demonstrate that each of the two glutamine-rich activation domains of the human transcription factor Sp1 can bind specifically and directly to the C-terminal evolutionarily conserved domain of the human TATA box-binding protein (TBP). These activation domains of Sp1 also bind directly to Drosophila TBP but bind much less stron...

The general consensus in the field is that limiting amounts of the transcription factor Dorsal establish dorsal boundaries of genes expressed along the dorsal-ventral (DV) axis of early Drosophila embryos, while repressors establish ventral boundaries. Yet recent studies have provided evidence that repressors act to specify the dorsal boundary of intermediate neuroblasts defective (ind), a gene...

The separation of biologically active, pure, and specific tRNAs is difficult due to the overall similarity in secondary and tertiary structures of different tRNAs. Because prior methods do not facilitate high-resolution separations of the extremely complex mixture represented by a cellular tRNA population, global studies of tRNA identity and/or abundance are difficult. We have discovered that t...