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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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Understanding GEMIN5 Interactions: From Structural and Functional Insights to Selective Translation.

Encarnacion Martinez-Salas1, Salvador Abellan1, Rosario Francisco-Velilla1

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GEMIN5 protein, a key part of the SMN complex, regulates gene expression by binding RNAs and proteins. Its dysfunction causes neurodevelopmental disorders, highlighting its critical role in human health.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Neuroscience

Background:

  • GEMIN5 is a cytoplasmic protein identified as part of the survival of motor neurons (SMN) complex.
  • It plays a crucial role in RNA-dependent processes through multi-component complexes.
  • Its modular structure allows diverse functions via interactions with various partners.

Purpose of the Study:

  • To review recent findings on the molecular mechanisms of GEMIN5 activity in gene expression.
  • To explore the structural organization and functional roles of GEMIN5.
  • To discuss the implications of GEMIN5 variants in human diseases.

Main Methods:

  • Literature review of recent scientific works on GEMIN5.
  • Analysis of GEMIN5's structural domains and interaction partners.
  • Examination of GEMIN5's role in RNA processing, splicing, and translation.

Main Results:

  • GEMIN5 recognizes small nuclear RNAs (snRNAs) via its N-terminal region, aiding snRNP assembly.
  • It regulates translation through interactions with RNA and proteins, influencing mRNA partitioning into polysomes.
  • GEMIN5's central dimerization domain facilitates protein-protein interactions, while its C-terminus binds RNA.

Conclusions:

  • Understanding GEMIN5's structure-function relationship is vital due to its implications in neurodevelopmental disorders.
  • GEMIN5 variants are linked to conditions such as neurodevelopmental delay, hypotonia, and cerebellar ataxia.
  • Further research is needed to uncover novel functions and therapeutic targets related to GEMIN5.