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COLI EXTRACT FOR PROTEIN SYNTHESIS
There are a variety of ways that toxin subunits may be synthesizedandarranged: A + B indicates that the toxin is synthesized andsecretedas two separate protein subunits that interact at the target cellsurface;A-Bor A-5B indicates that the A and B subunits are synthesizedseparately,but associated by noncovalent bonds during secretion and binding totheirtarget; 5B indicates that the binding domain of the protein iscomposedof 5 identical subunits. A/B denotes a toxin synthesized as asinglepolypeptide, divided into A and B domains that may be separated byproteolyticcleavage.
coli may result in the formation of protein aggregates, commonly known as inclusion bodies, as a result of imbalance between protein aggregation and solubilization.
Ribosomes - Protein Synthesis - Cronodon
It is disclosed here that a simple fractionation process can dramatically improve the performance of an S-30 prokaryotic protein synthesis reaction mixture.
There are four different nitrogen bases, adenine, thymine, cytosine and guanine. The synthesis of a particular protein such as insulin is determined by the sequence in which these bases are repeated (see fig.
E. COLI EXTRACT FOR PROTEIN SYNTHESIS - Patent - …
Sixty three nucleotides are required for synthesising the A chain and ninety for the B chain, plus a codon at the end of each chain,signalling the termination of protein synthesis.
The best known and studied bacterial toxin is the diphtheria toxin,produced by . Diphtheria toxin is abacterialexotoxin of the A/B prototype. It is produced as single polypeptidechainwith a molecular weight of 60,000 daltons. The function of the proteinis distinguishable into two parts: subunit A, with a m.w. of 21,000daltons,contains the enzymatic activity for inhibition of elongation factor-2involvedin host protein synthesis; subunit B, with a m.w. of 39,000 daltons, isresponsible for binding to the membrane of a susceptible host cell. TheB subunit possesses a region T (translocation) domain which insertsinto the endosome membrane thus securing the release of the enzymaticcomponent into the cytoplasm.
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