Controlling the rates of transcription and translation is...

Controlling the rates of transcription and translation is important in bacteria to avoid collisions between ribosomes and RNA polymerases. Calculate the maximum rate of translation by a ribosome in a bacterial cell, provided in units of amino acids per second, so that the ribosome doesn't overtake an RNA polymerase that is transcribing mRNA at a rate of 60 nucleotides per second. How long would it take for this bacterial cell to translate an mRNA containing 1800 codons?

Key Concepts

Translation Rate and Ribosomal Elongation

This concept describes how quickly a ribosome can add amino acids to a growing polypeptide chain. In bacteria, the translation machinery must operate at a rate that is harmonized with the transcription rate to prevent ribosomes from catching up with and colliding with the RNA polymerase.

Rate Calculation in Gene Expression

This involves applying quantitative reasoning to relate the transcription rate to the translation rate by taking into account the conversion of nucleotides to codons, and further using these rates to determine the time required for synthesizing a protein given its length in codons. This type of calculation helps in understanding how cellular processes are optimized to prevent molecular collisions.

Coupling of Transcription and Translation

In bacterial cells, transcription and translation are tightly coupled processes. The simultaneous nature of these processes requires precise regulation of their respective rates to ensure efficient and accurate gene expression without physical interference between molecular machines.

Transcription Rate

This refers to the speed at which RNA polymerase synthesizes mRNA by reading the DNA template. In bacteria, transcription is a rapid process measured in nucleotides per second, and its rate is a critical factor in coordinating gene expression.

Codons

Codons are sequences of three nucleotides in mRNA that encode specific amino acids during the process of translation. Understanding that one codon corresponds to one amino acid is essential for converting a transcription rate (in nucleotides per second) into a translation rate (in amino acids per second).

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