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Protein synthesis is completed through the process of protein translation. When a DNA molecule transcribes a transcript, messenger RNA is translated for protein synthesis. In the translation process, messenger RNA works with transfer RNA, tRNA, and ribosomes for the process of protein synthesis. Gene Process is defined as the entire transcription and translation process. Protein synthesis can be defined as the process by which amino acid molecules are organized as a single line of protein by the involvement of ribosomal RNA, transfer RNA, messenger RNA, and other enzymes.
The Central Dogma describes how DNA makes its copy by DNA replication, encodes RNA by transcription, and encodes RNA in proteins by translation.
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Keyterms: Protein synthesis, Protein, Protein translation, DNA, RNA, Gene, tRNA, mRNA, Ribosomes, Transcription, Translation, Amino acid, Enzymes, Central Dogma, DNA replication
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Translation Process in Protein Synthesis
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The translation is the process of protein synthesis of mRNA using the ribosome. The 5'to 3'mRNA translation unit contains the start codon, the polypeptide-encoded polypeptide, the stop codon, and the untranslated region (UTR) at the 5'and 3'endpoints. Both have improved process efficiency.
The ribosome is where all the translational mechanisms are located. Each eukaryotic ribosome has two small 40S subunit parts and one large 60S subunit. The smallest unit is the mRNA binding site. Together with the larger subunit, it forms a P-site or peptide transfer (donor site).
There are binding sites such as initiation factors, elongation factors, and translocations.
The video below explains this:
Translation in Protein Synthesis Detailed Video Explanation:
Function and Structure of tRNA in Protein Synthesis
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DNA is transcribed into mRNA based on its complementarity. The translation is the process of converting information from nucleic acids to amino acids. There are no amino acids and mRNA supplements. Therefore, translation is controlled by the genetic code, not complementarity. Amino acids are dependent on the adapter molecule because they cannot read this genetic code. This molecule is called the tRNA adapter (transmitter RNA).
Transfer RNAs are a family of about 60 small ribonucleic acids that recognize codons in mRNA, show higher affinity for 21 activated amino acids, and bind to it to transport it to the site of protein synthesis. The tRNA molecule is called soluble RNA or supernatant RNA or cell-adapted RNA in a variety of ways.
Structurally, tRNAs look like clover leaves or inverted L-shaped molecules, with amino acid receptor ends on one side and anticodon loops on the other. The chain curve of each tRNA molecule contains a defined series of three nitrogen-containing bases that form the anticodon. It Recognizes mRNA codons.
The function of tRNA is unique to protein synthesis because it picks up specific amino acids from a set of amino acids and transfers them to the mRNA string.
Structure of tRNA in protein synthesis
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Steps Involved in Protein Synthesis
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Initiation involves the assembly of ribosomes around the mRNA, the activation of amino acids, and its delivery to the transfer RNA.
Elongation is the process by which an RNA chain is extended by the addition of amino acids.
The termination process involves only the release of the polypeptide chain.
Explanation of Translation Procedure
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Initiation
- Prokaryotic initiation requires large and small ribosome subunits, mRNA, initiator transfer RNA, and three initiation factors (IFs).
- Amino acids are activated by binding to an enzyme called aminoacyl-tRNA synthetase in the presence of ATP. Aminoacyl-tRNA synthetase forms a P-site with an enzyme complex.
- Amino acid transfer RNA synthetase, amino acids, and ATP in the presence of PiAA-AMP enzyme complex
- Transfer of amino acids to tRNA-
Transfer RNA from AA-AMP Enzyme → Amino Acid-tRNAAMP Enzyme Complex.
- The ribosome has two sites, called the A site and the P site, where the ribosome unit binds to the cap region of the messenger RNA, a relatively small unit binds to the mRNA, and then a subunit. This causes the AUG to be present at the P site and the methionine tRNA to bind to the P site.
Elongation of the Polypeptide Chain
- At the second codon, another aminoacyl-transfer RNA complex that initiates loading binds to the A site.
- At the P site, a peptide bond is observed between the carboxyl molecule and the amino molecule, and at the A site, a bond is formed between the amino molecule and the amino acid by an enzyme called peptidyl transferase.
- The ribosome slides on the messenger RNA from one codon to its alternative codon in the 5'to 3'direction.
- A polypeptide chain is formed by forming an amino acid in an alternative within the chain formed by the peptide bond, and the compound is based on a codon sequence that results in the extension of the protein chain.
Peptide Termination
- When a stop codon that does not encode an amino acid reaches the A site of the ribosome, the charged transfer RNA does not bind to the A site of the ribosome.
- The polypeptide is currently not bound to the ribosome, dissociates, and is catalyzed by a "release factor," a factor that releases three stop codons called UGA, UAG, and UAA.
Protein Synthesis Diagram
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Protein synthesis
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Things To Remember
- Protein synthesis is completed through the process of protein translation. When a DNA molecule transcribes a transcript, messenger RNA is translated for protein synthesis.
- In the translation process, messenger RNA works with transfer RNA, tRNA, and ribosomes for the process of protein synthesis. Gene Process is defined as the entire transcription and translation process. Protein synthesis can be defined as the process by which amino acid molecules are organized as a single line of protein by the involvement of ribosomal RNA, transfer RNA, messenger RNA, and other enzymes.
- Structurally, tRNAs look like clover leaves or inverted L-shaped molecules, with amino acid receptor ends on one side and anticodon loops on the other. The chain curve of each tRNA molecule contains a defined series of three nitrogen-containing bases that form the anticodon. It Recognizes mRNA codons.
Read Also: Class 12 Human Genome Project
Sample Questions
Ques: Explain the RNA which is involved in protein synthesis. (3 marks)
Ans: The translation process takes place in the cytoplasm of the cell. Some changes are made to the core before it is moved. Unnecessary parts are removed and adjusted to protect the ends of the mRNA molecule, and the mRNA molecule is ready for translation protein synthesis. Another RNA involved is called a transfer RNA, which is shaped like a cloverleaf with three loops. There is an anticodon site with a special part in the center of the loop, and one side also contains an amino acid site. Anticodons play an important role in the recognition of specific messenger RNAs called launch codons.
Ques: What happens after the translation process? (3 marks)
Ans: Transcription and translationare two processes called complete gene expression that lead to the formation of polypeptide chains. Once the polypeptide chain is synthesized, several additional processes are performed. For example, the interactions between amino acids in a chain can cause the amino acids to fold. It can also bind to other polypeptides and various types of structures such as lipids and carbohydrates. Many proteins make it to the cytoplasmic Golgi apparatus. The Golgi apparatus is adapted to perform certain functions of the core.
Ques: Why is transcription required for protein synthesis? (3 marks)
Ans: DNA is like a reference library. You can look at the book and make a copy, but you cannot remove the core from the room. The translation is the process by which a copy of mRNA is transferred to the ribosome in the cytoplasm and used to create a protein molecule in which all amino acids are in the correct order. This is probably the most intelligent mechanism in life.
Ques: How much information is translated during protein synthesis? (3 marks)
Ans: The nucleotide language of messenger RNA (mRNA) is translated into the language of amino acids and polypeptide chains, eventually forming the primary structure of the protein. This is done by transferring RNA (tRNA) to the ribosome. In the ribosome, mRNA slides three letters at a time (triple codon). tRNAs have anticodons that read triplet codons, and in other races, each pair has different amino acids. From tRNA. Amino acids are bound by peptide bonds to form the polypeptide chain that forms the primary structure of the protein being synthesized.
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