Spliceosome
Spliceosome - Related Videos
07:35
Analysis of Spliceosomal snRNA Localization in Human Hela Cells Using Microinjection
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Cited by 5 •
2019
Biogenesis of spliceosomal snRNAs is a complex process involving various cellular compartments. Here, we employed microinjection of fluorescently labelled snRNAs in order to monitor their transport inside the cell.
05:44
Utilization of Grafix for the Detection of Transient Interactors of Saccharomyces cerevisiae Spliceosome Subcomplexes
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Cited by 1 •
2020
Here, we describe the utilization of Grafix (Gradient Fixation), a glycerol gradient centrifugation in the presence of a crosslinker, to identify interactions between splicing factors that bind transiently to the spliceosome complex.
07:31
ACT1-CUP1 Assays Determine the Substrate-Specific Sensitivities of Spliceosomal Mutants in Budding Yeast
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2022
The ACT1-CUP1 assay, a copper growth assay, provides a quick readout of precursor messenger RNA (pre-mRNA) splicing and the impact mutant splicing factors have on spliceosomal function. This study provides a protocol and highlights the customization possible to address the splicing question of interest.
02:18
Alternative RNA Splicing
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2020
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity. There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
02:50
Conjugated Proteins
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2020
Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties. Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
FAQs
The branch-point sequence provides a required recognition signal within the intron, alongside the conserved splice sites at the intron boundaries. Spliceosome components identify these sequence features before catalysis begins, helping position the precursor messenger RNA correctly. Accurate recognition is therefore essential for selecting the proper intron boundaries and producing a correctly processed transcript.
The reactions occur sequentially after spliceosome assembly and splice-site recognition. Together, they remove the intron and connect the neighboring exons, converting precursor messenger RNA into mature messenger RNA. Because the reactions depend on correctly aligned RNA sequences and spliceosome components, errors in recognition or reaction order can disrupt the final transcript and its capacity to support accurate gene expression.
Assembly changes as small nuclear ribonucleoproteins and associated proteins recognize the precursor messenger RNA, conserved splice sites, and branch-point sequence, then support catalysis and intron removal. This changing molecular organization allows the machine to coordinate recognition with the two reaction steps. Its dynamic behavior also provides a basis for regulation, including regulation that affects transcript diversity.
Alternative splicing allows different exon combinations or transcript-processing choices to arise from the same gene, producing multiple messenger RNA variants. Those RNA variants can subsequently specify multiple protein variants. This expands the functional outputs of a genome without requiring a separate gene for every product, making spliceosome regulation especially relevant to cellular differentiation and development.
Analyzing assembly and regulation can reveal how cells control intron removal, exon joining, and the generation of alternative transcripts. These studies connect molecular RNA-processing events with broader outcomes in gene expression, development, and cellular differentiation. They can also help identify how altered processing contributes to disease, providing a framework for interpreting abnormal transcript patterns.
Changes in spliceosome activity can influence which messenger RNA and protein variants cells produce. Because transcript diversity contributes to gene-expression programs, RNA processing is relevant to development and cellular differentiation, when cells acquire distinct properties. Abnormal RNA processing is also associated with disease, so studying spliceosome regulation helps connect molecular processing defects with biological consequences.