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Dressing Essay

  • Submitted by: asifmasih
  • on September 1, 2013
  • Category: Miscellaneous
  • Length: 806 words

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Below is an essay on "Dressing" from Anti Essays, your source for research papers, essays, and term paper examples.

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Lecture No: Molecular Biology (BIOT 313) Spring 2012

Anood Atta Lecturer (Biological Sciences) Forman Christian College (A Chartered University) Lahore
BIOT 313 (Spring 2012) 1

Stage 1: Aminoacyl-tRNA Synthetases Attach the Correct Amino Acids to Their tRNAs

During the first stage of protein synthesis, taking place in the cytosol, aminoacyl-tRNA synthetases esterify the 20 amino acids to their corresponding tRNAs. Each enzyme is specific for one amino acid and one or more corresponding tRNAs. Most organisms have one aminoacyltRNA synthetase for each amino acid. For amino acids with two or more corresponding tRNAs, the same enzyme usually aminoacylates all of them. The reaction catalyzed by an aminoacyl-tRNA synthetase is Amino acid + tRNA + ATP aminoacyl-tRNA+AMP+ PPi

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Stage 2: A Specific Amino Acid Initiates Protein Synthesis

AUG initiation codon thus specifies an amino-terminal methionine residue. Although methionine has only one codon, (5)AUG, all organisms have two tRNAs for methionine. One is used exclusively when (5)AUG is the initiation codon for protein synthesis. The other is used to code for a Met residue in an internal position in a polypeptide.

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Elongation
 Step 1  Step 2
 Step 3

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Stage 4: Termination of Polypeptide Synthesis Requires a Special Signal Elongation continues until the ribosome adds the last amino acid coded by the mRNA. Termination, the fourth stage of polypeptide synthesis, is signaled by the presence of one of three termination codons in the mRNA (UAA, UAG, UGA), immediately following the final coded amino acid. Mutations in a tRNA anticodon that allow an amino acid to be inserted at a termination codon are generally deleterious to the...

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