Studies on the outer surface of normal and RSV-transformed BHK fibroblast plasma membrane

P. M. Comoglio, G. Tarone, M. Prat, M. Bertini

Research output: Contribution to journalArticlepeer-review


The probe trinitrobenzene sulphonate (TNBS) was used to selectively label the cell surface of normal and Rous sarcoma virus-transformed BHK fibroblasts. A five-fold increase in the number of TNBS-binding groups exposed on the outer membrane surface after neoplastic transformation was measured. The extra trinitrophenyl (TNP) groups bound by transformed cells were mostly removable by mild trypsinization and no differences were found between the amount of TNP bound by phospholipids in both normal and transformed cells. SDS-acrylamide patterns of TNP-labelled membrane proteins purified from normal and transformed cells showed only minor differences. This led to the conclusion that the increased exposure of TNBS-binding groups was due mainly to different binding properties of membrane proteins towards the probe rather than the appearance of new surface components in transformed cells.

Original languageEnglish
Pages (from-to)402-410
Number of pages9
JournalExperimental Cell Research
Issue number2
Publication statusPublished - 1975

ASJC Scopus subject areas

  • Cell Biology


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