Elongation Phase
Elongation Phase - Related Videos
02:35
Transcription Elongation Factors
0 Views •
2020
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene. The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
02:35
Transcription Elongation Factors
0 Views •
2023
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene. The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
10:46
Novel Metrics to Characterize Embryonic Elongation of the Nematode Caenorhabditis elegans
0 Views •
Cited by 3 •
2016
Here we detail protocols specifically designed to monitor morphogenic defects that occur during early and late phases of embryonic elongation of the nematode Caenorhabditis elegans. Ultimately, these protocols are designed to identify genes that regulate these phases and to characterize their differential requirements along the antero-posterior axis of the embryo.
02:39
Phase Diagrams
0 Views •
2020
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
02:31
Phase Transitions
0 Views •
2020
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
FAQs
Complementary matching between each mRNA codon and its incoming transfer RNA helps determine which amino acid is added next. This pairing links the nucleotide sequence to the order of amino acids in the growing chain. Because codons are read successively, the resulting polypeptide follows the information encoded in the mRNA rather than an arbitrary sequence.
During the Elongation Phase, translocation shifts the ribosome along the mRNA after peptide-bond formation. This movement places the next codon in position for recognition and allows another transfer RNA to participate in the cycle. Repeated translocation coordinates ribosome position, codon reading, and continued chain extension as synthesis proceeds through the mRNA sequence.
Peptide-bond formation is the chemical step that joins a newly delivered amino acid to the existing polypeptide chain. Its repeated occurrence converts individual amino-acid deliveries into a longer molecule. Because the ribosome performs this step as codons are read, chain growth preserves the sequence information needed to produce a specific protein.
Accuracy depends on maintaining the connection between codon recognition and amino-acid delivery. A transfer RNA must correspond to the mRNA codon being read; otherwise, the growing chain could receive an incorrect building block. Studying this relationship helps explain how translation errors can alter protein production and supports research into diseases linked to such errors.
A practical description of one elongation cycle begins with codon recognition by a complementary transfer RNA, followed by delivery of its amino acid. The ribosome then forms a peptide bond and moves along the mRNA. Repeating these steps extends the polypeptide in sequence until the ribosome reaches a stop codon.
A stop codon establishes the endpoint of the repeated elongation cycle. The ribosome continues moving through the mRNA and adding amino acids while the sequence is being read. Once it reaches a stop codon, the process no longer continues by adding another amino acid, providing a defined boundary for the polypeptide.
Because elongation is required for accurate protein production, researchers can examine codon recognition, peptide-bond formation, and ribosome movement when investigating translation problems. This process provides a framework for studying antibiotics and diseases linked to errors in protein production, especially when changes interfere with the ordered progression of synthesis.
The amino-acid sequence generated during elongation forms a polypeptide that contributes to production of a specific protein. Studying how faithfully the ribosome follows mRNA therefore connects molecular events in translation with the creation of functional molecules. This relationship also gives biology researchers context for examining gene regulation and protein-synthesis errors.