What is S in rRNA?

16S rRNA (16S ribosomal RNA), is a component of the prokaryotic ribosome 30S subunit. The “S” in 16S is a sedimentation coefficient, that is, an index reflecting the downward velocity of the macromolecule in the centrifugal field. The higher the value, the greater the molecule.

What is the significance of rRNA in gene expression?

They serve critical roles in forming the catalytic sites of translation of mRNA. During translation of mRNA, rRNA functions to bind both mRNA and tRNA to facilitate the process of translating mRNA’s codon sequence into amino acids.

Is ribosomal RNA single or double stranded?

The secondary structure of rRNA in consequence is a complex pattern of short double-stranded stems, [red blocks] interspersed with unpaired single-stranded loops and bubbles [black lines]. Note that the rRNA structure above is a single, continuous strand H-bonded back on itself, with a 5′ beginning and 3′ end.

What is the role of rRNA in the process of protein synthesis?

The primary function of rRNA is in protein synthesis – in binding to messenger RNA and transfer RNA to ensure that the codon sequence of the mRNA is translated accurately into amino acid sequence in proteins.

What is 5S rRNA and how is it made?

5S rRNA is a molecule of approximately 120 nucleotides typically transcribed by RNA polymerase III. In higher eukaryotes, 5S rDNA genes are found in clusters in regions which are distinct from the major unit rDNA repeats while in S. cerevisiae 5S genes are immediately adjacent to the rDNA repeats (reviewed in Ciganda and Williams, 2011 ).

How are 5S rDNA genes found in yeast?

In higher eukaryotes, 5S rDNA genes are found in clusters in regions which are distinct from the major unit rDNA repeats while in S. cerevisiae 5S genes are immediately adjacent to the rDNA repeats (reviewed in Ciganda and Williams, 2011 ). The initial transcript in yeast contains 3′ extensions of 7–13 nucleotides.

Is trimming of the 3′ end of 5S rRNA essential for Yeast viability?

The trimming of the 3′ end of 5S rRNA is not essential for yeast viability. An association between 5S rRNA and the La protein assists in the folding and maturation of the 3′ ends of 5S rRNA ( Wolin and Cedervall, 2002 ).