Ribosome

[arauca]

Are there different Ribiosomes for different proteins ?

As a protein is going to be made a Ribosomes is made ?

There is a fixed Ribosomes and the mature RNA sets a mold for specific protein to be made ? If so at the end of a batch of specific protein what decomposes the mold ?

[Jon Moulton]

Are there different Ribiosomes for different proteins ?

As a protein is going to be made a Ribosomes is made ?

There is a fixed Ribosomes and the mature RNA sets a mold for specific protein to be made ? If so at the end of a batch of specific protein what decomposes the mold ?

As far as I know, each prokaryotic species makes only one kind of ribosome and each eukaryotic species makes only two kinds (one for the cytosol and one in mitochondria). The cell is already stocked with ribosomes when each new transcript is made, processed, and made ready to be translated into a protein. However, ribosome synthesis continues through the life of the cell, replacing old ribosomes and providing new ribosomes for cell division.

The ribosome and mature mRNA do not form a mold, but rather a linear instruction set. The mRNA moves through the ribosome during protein synthesis and tRNA molecules match up with each new codon of the ribosome; if the tRNA matches, the amino acid it carries is attached to the new protein and the mRNA moves three bases to bring the next codon to the part of the ribosome where tRNAs are tried against the codon.

To see a site that introduces translation in more detail, along with some animation, search Wikipedia for the keyword "Gene_translation"

[arauca]

As far as I know, each prokaryotic species makes only one kind of ribosome and each eukaryotic species makes only two kinds (one for the cytosol and one in mitochondria). The cell is already stocked with ribosomes when each new transcript is made, processed, and made ready to be translated into a protein. However, ribosome synthesis continues through the life of the cell, replacing old ribosomes and providing new ribosomes for cell division.

The ribosome and mature mRNA do not form a mold, but rather a linear instruction set. The mRNA moves through the ribosome during protein synthesis and tRNA molecules match up with each new codon of the ribosome; if the tRNA matches, the amino acid it carries is attached to the new protein and the mRNA moves three bases to bring the next codon to the part of the ribosome where tRNAs are tried against the codon.

To see a site that introduces translation in more detail, along with some animation, search Wikipedia for the keyword "Gene_translation"

Thank you for your enlightening , about the m RNA moving trough thi Ribosomes , any idea on the process if more then one protein molecule is to be made , is it necessary to have an second mRNA molecule or the previous mRNA is used as a repeat. ?

[Jon Moulton]

The mRNA can be translated and re-translated until it decays, often producing several-to-many proteins from a single message. If there is a premature termination codon in the mRNA, it generally will decay after a single translation (by the nonsense-mediated decay pathway).