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Mapping the functional domains of the eukaryotic elongation factor 1 beta gamma.

The functional domains of the eukaryotic elongation factor (EF) 1 beta gamma have been delineated with the use of limited proteolysis, protein microsequencing, gel electrophoresis under non-denaturing conditions and antibodies against EF-1 beta and EF-1 gamma. By means of limited proteolysis, it was possible to obtain large fragments of EF-1 beta. In contrast to amino-terminal fragments, those derived from the carboxy-terminal part of EF-1 beta were still active in enhancing the guanine nucleotide exchange of GDP bound to EF-1 alpha. With the same technique of limited proteolysis, it was possible to isolate a trypsin-resistant core from EF-1 beta gamma containing polypeptide chain fragments derived from both subunits. A polyvalent antiserum against EF-1 beta and two monoclonal antibodies against EF-1 gamma were used to identify the protein fragments in this core. The monoclonal antibodies were shown to recognize different epitopes, one localized on the amino-terminal and another on the carboxy-terminal half of EF-1 gamma. The antiserum against EF-1 beta and one of the monoclonal antibodies (mAb 36E5), which recognized the amino-terminal half of EF-1 gamma, reacted with this trypsin-resistant core. We conclude that the amino-terminal halves of both EF-1 beta and EF-1 gamma are firmly attached to each other, and that the carboxy-terminal part of EF-1 beta interacts with EF-1 alpha.[1]

References

  1. Mapping the functional domains of the eukaryotic elongation factor 1 beta gamma. van Damme, H., Amons, R., Janssen, G., Möller, W. Eur. J. Biochem. (1991) [Pubmed]
 
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