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Growth and morphogenesis in Streptomyces
E M Miguélez1, C Martín, M B Manzanal
1Departamento de Biología Funcional, Facultad de Medicina, Universidad de Oviedo, Spain.
FEMS Microbiology Letters
|December 15, 1992
Summary
This study presents a model for apical growth in streptomycetes, detailing how the multilayered cell wall expands via an inside-to-outside mechanism driven by internal pressure and bond cleavage, coordinating with chromosome replication.
Area of Science:
- Microbiology
- Cell Biology
- Biophysics
Background:
- Streptomycetes exhibit complex apical growth essential for their development.
- The precise mechanisms governing cell wall expansion at the hyphal tip remain incompletely understood.
Purpose of the Study:
- To propose a novel model for apical growth in streptomycetes.
- To elucidate the biophysical processes involved in cell wall expansion at the hyphal tip.
Main Methods:
- Development of a theoretical model for apical growth.
- Incorporation of peptidoglycan synthesis and cell wall layer dynamics.
- Integration of hydrostatic pressure and bond cleavage as growth drivers.
Main Results:
- The model describes apical tip expansion as a multilayered structure growing from inside to outside.
- Cell wall layers slide outwards due to hydrostatic pressure and bond cleavage.
- A regulatory mechanism coordinating growth with chromosome replication is proposed.
Conclusions:
- The proposed model offers a mechanistic explanation for streptomycete apical growth.
- This framework integrates cell wall synthesis, biophysics, and cell cycle regulation.
- The model provides a basis for future experimental validation of hyphal tip growth dynamics.
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