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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Davis, B. D. Smith, W. P. Tai, P. C. Thompson, R. C. |
| Abstract | To provide direct evidence for the hypothesis that secreted proteins may traverse membranes as growing chains, we labeled spheroplasts of Escherichia coli with a reagent (acetyl[35S]methionyl methylphosphate sulfone) that reacts with amino groups but does not cross the membrane. After fractionation, about 6% of the label in the membrane-polysome fraction was found to be attached to the polysomes. This attachment was via peptidyl-tRNA, as shown by several tests: release of most of the label from purified polysomes at low Mg2+; subsequent loss of about 25,000 daltons on cleavage by dilute alkali; release by puromycin; and release, accompanied by a marked increase in average molecular weight, on peptide chain completion. Moreover, a significant fraction of the completed chains was identified serologically and by molecular weight as a major periplasmic protein, alkaline phosphatase [orthophosphoric-monoester phosphohydrolase (alkaline optimum); EC 3.1.3.1]. This work provides direct evidence that: (i) secreted proteins thread through the membrane as growing peptide chains; and (ii) membrane-associated polysomes in bacteria are functionally attached to membrane and not merely trapped on disruption of the cell. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 7 |
| Volume Number | 74 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1977-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Bacterial Proteins Secretion Escherichia Coli Metabolism Polyribosomes Alkaline Phosphatase Biosynthesis Cell Membrane Enzyme Precursors RNA, Transfer Sulfones Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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