Identification of proteins of the 40 S ribosomal subunit involved in interaction with initiation factor eIF-2 in the quaternary initiation complex by means of monospecific antibodies

Monospecific polyclonal antibodies against seven proteins of the 40 S subunit of rat liver ribosomes were used to identify ribosomal proteins involved in interaction with initiation factor eIF-2 in the quaternary initiation complex [eIF-2 × GMPPCP × [ 3H]Met-tRNA f × 40 S ribosomal subunit]. Dimeric...

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Veröffentlicht in:FEBS letters 1988-06, Vol.233 (1), p.114-118
Hauptverfasser: Bommer, Ulrich-Axel, Stahl, Joachim, Henske, Annemarie, Lutsch, Gudrun, Bielka, Heinz
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Sprache:eng
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Zusammenfassung:Monospecific polyclonal antibodies against seven proteins of the 40 S subunit of rat liver ribosomes were used to identify ribosomal proteins involved in interaction with initiation factor eIF-2 in the quaternary initiation complex [eIF-2 × GMPPCP × [ 3H]Met-tRNA f × 40 S ribosomal subunit]. Dimeric immune complexes of 40 S subunits mediated by antibodies against ribosomal proteins S3a, S13/16, S19 and S24 were found to be unable to bind the ternary initiation complex [eIF-2 × GMPPCP × [ 3H]Met-tRNA f]. In contrast, 40 S dimers mediated by antibodies against proteins S2, S3 and S17 were found to bind the ternary complex. Therefore, from the ribosomal proteins tested, only proteins S3a, S13/16, S19 and S24 are concluded to be involved in eIF-2 binding to the 40 S subunit.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(88)81366-8