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Related Concept Videos

Leaky Scanning02:28

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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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Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Protein Digestion01:02

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Protein digestion begins in the stomach, where the highly acidic environment can easily disrupt protein structure by exposing the peptide bonds of polypeptide chains. After polypeptide chains are broken into individual amino acids by a series of digestive enzymes, the amino acids are transported to the liver via the bloodstream to produce energy.
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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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Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick.  Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
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An Integrated Approach for Microprotein Identification and Sequence Analysis
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Emerging evidence for functional peptides encoded by short open reading frames.

Shea J Andrews1, Joseph A Rothnagel1

  • 1School of Chemistry and Molecular Biosciences, University of Queensland, St. Lucia, Queensland, 4072, Australia.

Nature Reviews. Genetics
|February 12, 2014
PubMed
Summary
This summary is machine-generated.

Short open reading frames (sORFs) are genomic sequences previously overlooked for their coding potential. New research confirms their translation, revealing novel peptide products with unknown cellular functions.

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Area of Science:

  • Genomics
  • Proteomics
  • Molecular Biology

Background:

  • Short open reading frames (sORFs) are prevalent in genomes but their translation and function are poorly understood.
  • The coding potential of sORFs has been historically disregarded due to challenges in verifying translation.
  • Recent technological advancements are enabling the identification and validation of sORF translation.

Purpose of the Study:

  • To review the current understanding of sORFs and their encoded peptides.
  • To explore the potential roles of sORF-encoded peptides in cellular functions.
  • To highlight the significance of this overlooked proteome component.

Main Methods:

  • Computational analysis of genomic sequences to identify sORFs.
  • Proteomic techniques to detect and confirm the translation of sORFs.
  • High-throughput analysis of translation start sites.

Main Results:

  • Hundreds of putative coding sORFs have been identified using advanced methods.
  • The translation of a subset of these sORFs has been experimentally confirmed.
  • The functional contribution of sORF-encoded peptides to cellular processes remains largely uncharacterized.

Conclusions:

  • sORFs represent a significant, yet underappreciated, component of the proteome.
  • Further research is needed to elucidate the functions of sORF-encoded peptides.
  • Investigating sORFs opens new avenues for understanding genome coding capacity and cellular regulation.