Definition
of amino acid dehydration condensation forms a plurality of peptide bonds to form a peptide, and a plurality of peptides have a multi-stage fold to form a protein molecule. Proteins are sometimes also referred to as "polypeptide" (Polypeptide).
polypeptide biosynthesis
At the same time, the transfer RNA (TRNA) of the cytoplasm is placed on the respective position of the specific amino acid it carries it at the corresponding position of the mRNA of the ribosome, and then TRNA leaves Ribosome, re-transport the corresponding amino acid (Aminoacid), in this case, always carrying the TRNA carrying methionine first into the ribosomal, and then the TRNA with the second amino acid is entered. Thiine TRNA removes methionine, placed on the initial password of mRNA, then leaves the ribosome,
polypeptide chain chart (7 photos)
Metalmonia The -COOH end of the acid forms a peptide bond with the second amino acid-NH2. Next, TRNA carrying the third amino acid into the ribosomal, and -COOH of the second amino acid is also form a peptide bond with -NH2 of the third amino acid. The second TRNA is also separated from the ribosomide, and then carrying the corresponding amino acid, the fourth amino acid TRNA enters the ribosome. TRNA enters the sequence of ribosome, is determined by the genetic password of mRNA. In this way, it is repeated until the synthesis of the peptide chain is over until it comes to the termination password on the mRNA. The genetic password of mRNA is translated into a polypeptide chain. When a polypeptide chain is completed, the ribosome uses the polypeptide chain to release the polypeptide chain through the disc, and the protein molecule having a certain spatial structure is formed, and the ribosome also falls from mRNA. Next, re-re-bind to mRNA, participate in the synthesis of the next protein, one mRNA can slide above, and a ribosome can synthesize a protein molecule, so a mRNA can simultaneously synthesize a plurality of polypeptide chains.