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Related Concept Videos

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Conserved Binding Sites

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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Updated: Aug 11, 2025

Sample Preparation for Mass Spectrometry-based Identification of RNA-binding Regions
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RNA binding protein SAMD4: current knowledge and future perspectives.

Xin-Ya Wang1, Li-Na Zhang2

  • 1Beijing International Science and Technology Cooperation Base of Antivirus Drug, Faculty of Environment and Life, Beijing University of Technology, 100124, Beijing, People's Republic of China.

Cell & Bioscience
|February 3, 2023
PubMed
Summary
This summary is machine-generated.

The SAMD4 protein family regulates gene expression post-transcriptionally. These RNA-binding proteins are crucial in cellular processes and implicated in diseases like cancer and developmental disorders.

Keywords:
Post-transcriptional regulatorRNA-binding proteinSAM domainSAMD4ASAMD4BSmaugTranslational repressor

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The SAMD4 protein family comprises novel RNA-binding proteins conserved across eukaryotes.
  • SAMD4A/Smaug1 and SAMD4B/Smaug2 bind target mRNAs via Smaug recognition elements (SREs) to control mRNA fate.
  • SAMD4 proteins are involved in cytoplasmic mRNA silencing and mitochondrial function.

Purpose of the Study:

  • To review the structural features of SAMD4 proteins.
  • To summarize the diverse biological functions of SAMD4 family members.
  • To elucidate the molecular mechanisms regulating SAMD4 activity.

Main Methods:

  • Literature review of studies on SAMD4 protein family.
  • Analysis of structural characteristics and functional domains.
  • Compilation of research on biological roles and pathological involvement.

Main Results:

  • SAMD4 proteins possess a conserved SAM domain for mRNA binding.
  • They regulate mRNA stability, degradation, and translation, forming silencing foci.
  • SAMD4 proteins are implicated in myopathy, bone and neural development, and cancer.

Conclusions:

  • SAMD4 proteins are key regulators of post-transcriptional gene expression.
  • Their functions extend to cellular organization and mitochondrial regulation.
  • Understanding SAMD4 mechanisms offers potential for clinical applications in various diseases.