Inhibition of cell-free protein synthesis by hydrostatic pressure.
Pressure inhibition of cell-free polypeptide synthesis is manifested in the same manner as that observed in the intact cell: (i) starting at approximately 200 atm, there is a progressive inhibition with increasing pressures; (ii) there is complete inhibition at 680 atm; (iii) incorporation into polypeptide is instantaneously reversible after pressure release and proceeds at a rate parallel to an atmospheric control; and (iv) the volume change of activation (DeltaV*) is 100 cm(3)/mole. Peptide bond formation per se can occur at a pressure level which is totally inhibitory to polypeptide synthesis. The one investigated step in translation that is inhibited in an identical manner is the binding of aminoacyl-transfer ribonucleic acid (AA-tRNA) to the ribosome-messenger RNA (mRNA) complex. The volume change of activation (DeltaV*) calculated for the binding reaction is also 100 cm(3)/mole. Thus, the inability of AA-tRNA to bind to ribosomes and mRNA under pressure, possibly in conjunction with translocation, appears to be responsible for the observed inhibition of the translational mechanism.
D001426:Bacterial Proteins / Q000096:biosynthesis*; D002247:Carbon Isotopes; D002474:Cell-Free System; D003090:Coliphages; D004926:Escherichia coli; D006874:Hydrostatic Pressure; D010452:Peptide Biosynthesis; D010649:Phenylalanine / Q000378:metabolism; D011072:Poly U / Q000378:metabolism; D011312:Pressure; D011485:Protein Binding; D014176:Protein Biosynthesis; D011691:Puromycin / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D012343:RNA, Transfer / Q000378:metabolism; D012367:RNA, Viral / Q000378:metabolism; D012270:Ribosomes / Q000378:metabolism
D001426:Bacterial Proteins; D002247:Carbon Isotopes; D012333:RNA, Messenger; D012367:RNA, Viral; D011072:Poly U; D010649:Phenylalanine; D011691:Puromycin; D012343:RNA, Transfer