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Related Concept Videos

tRNA Activation02:26

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
tRNA Activation02:26

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
From DNA to Protein03:06

From DNA to Protein

The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
The Central Dogma01:25

The Central Dogma

Overview
The Central Dogma01:20

The Central Dogma

The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
Transfer RNA Synthesis02:36

Transfer RNA Synthesis

One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...

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tRNAs: cellular barcodes for amino acids.

Rajat Banerjee1, Shawn Chen, Kiley Dare

  • 1Department of Microbiology, Center for RNA Biology, Ohio State University, Columbus, OH 43210, USA.

FEBS Letters
|November 12, 2009
PubMed
Summary
This summary is machine-generated.

Transfer RNAs (tRNAs) are crucial for protein synthesis, delivering amino acids to ribosomes. Emerging research reveals tRNAs also serve diverse non-translational roles, expanding their known functions in cellular processes.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Transfer RNAs (tRNAs) are traditionally known for their essential role in translating the genetic code.
  • The specific selection and delivery of amino acids to the ribosome by tRNAs in response to mRNA codons are well-understood.

Purpose of the Study:

  • To review and highlight alternative, non-translational functions of tRNAs.
  • To present tRNA's broader role in cellular processes beyond protein synthesis.

Main Methods:

  • Literature review of scientific studies on tRNA functions.
  • Analysis of examples demonstrating tRNA's involvement in various biological pathways.

Main Results:

  • tRNAs deliver aminoacyl-tRNAs as substrates in processes beyond translation.
  • Examples include lipid modification and antibiotic biosynthesis.
  • These findings indicate a wider functional scope for tRNAs.

Conclusions:

  • The role of tRNA extends beyond its canonical function in protein synthesis.
  • tRNAs are versatile molecules involved in a variety of cellular processes.
  • This suggests a re-evaluation of tRNA's fundamental role in biology.