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Bacteriophage P2 and P4 morphogenesis: protein processing and capsid size determination
1Institute of Biology, University of Oslo, Norway.
Virology
|April 1, 1992
Summary
Bacteriophage P2 and P4 capsid size differences are not due to protein processing. Studies show that the cleavage of the primary translation product gpN into capsid proteins does not explain the switch in bacteriophage head size.
Area of Science:
- Virology
- Molecular Biology
- Structural Biology
Background:
- Bacteriophage P2 and P4 exhibit distinct capsid sizes (60 nm vs. 45 nm).
- The primary translation product gpN is processed into several capsid proteins, including h1, h2, and N*.
Purpose of the Study:
- To investigate the role of protein processing of gpN in the size determination of bacteriophage P2 and P4 capsids.
- To identify the structural components derived from gpN in mature P2 and P4 particles.
Main Methods:
- Utilized antibodies specific to gpN and its derivatives.
- Quantified the relative amounts of gpN derivatives in mature P2 and P4 particles.
- Identified the specific cleavage sites of gpN into h1, h2, and N*.
Main Results:
- Identified all gpN-derived structural components in both P2 and P4 capsids.
- Estimated relative amounts of gpN derivatives, suggesting h1 and h2 are minor components of P2 but essential for P4.
- Found similar in vivo relative amounts of gpN derivatives during P2 and P4 infections.
- Confirmed identical cleavage sites for gpN in both bacteriophage systems.
Conclusions:
- The protein processing reactions of gpN are not directly responsible for the size switch between P2 and P4 bacteriophage capsids.
- The observed differences in capsid size are likely regulated by mechanisms other than the abundance or processing of gpN derivatives.