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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Polyketide synthases (PKS) are complex multienzyme systems.
  • PKS are known for stereospecificity and directional biosynthesis.
  • Understanding PKS mechanisms is crucial for synthetic biology.

Purpose of the Study:

  • To review the mechanistic origins of stereospecificity in PKS.
  • To explore the phenomenon of directional biosynthesis in PKS.
  • To present a model for assembly line PKS biosynthesis.

Main Methods:

  • Review of existing literature on PKS mechanisms.
  • Analysis of stereocenter formation in 6-deoxyerythronolide B.
  • Application of theoretical framework for coupled vectorial processes.

Main Results:

  • Ketoreductase domains set the stereochemistry for nine carbon atoms in 6-deoxyerythronolide B.
  • The 10th stereocenter is formed by sequential domain action.
  • A model for PKS as a coupled vectorial process, emphasizing domain-domain interactions, is proposed.

Conclusions:

  • Gaps remain in understanding the structural basis of stereochemical control in PKS active sites.
  • The proposed model for vectorial biosynthesis is testable and amenable to refinement.
  • Further research combining structural, kinetic, spectroscopic, and computational tools is needed to elucidate PKS module coordination.