Get expert answers to your genetic research questions. Connect with scientists and researchers worldwide.
Latest Questions
What causes proteins expressed in the bacterial cytoplasm to form inclusion bodies?
Intracellular expression is the primary form of recombinant protein expression in E. coli. However, the E. coli cytoplasm has a reducing environment, which is unfavorable for the formation and stability of protein disulfide bonds. This leads to incorrect protein folding and the formation of insoluble inclusion bodies. Protein kinetic model studies indicate that the yield of active protein also depends on the rates of protein synthesis, folding, and aggregation. When foreign proteins are highly expressed in E. coli, if the aggregation rate of nascent polypeptide chains exceeds their folding rate, it leads to inclusion body formation.
Why do overlapping peaks often occur when sequencing PCR products?
Overlapping peaks (mixed sequences) in PCR product sequencing generally occur for the following reasons:
(1) The PCR template is impure or the PCR primers lack specificity, resulting in amplification products that include fragments of similar length to the target fragment, which cannot be separated even by gel electrophoresis. Sequencing such PCR products results in overlapping peaks.
(2) Structural reasons can cause overlapping peaks in PCR product sequencing. The presence of polyA/G/C/T tracts or other complex structures of unknown origin can lead to overlapping sequencing results.