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A model for early events in the assembly pathway of cyanobacterial phycobilisomes Anderson LK; Toole CMMol Microbiol 1998[Nov]; 30 (3): 467-74Biological self-assembly is remarkable in its fidelity and in the efficient production of intricate molecular machines and functional materials from a heterogeneous mixture of macromolecules. The phycobilisome, a light-harvesting structure of cyanobacteria, presents the opportunity to study an in vivo assembly process in detail. The phycobilisome molecular architecture is defined, and crystal structures are available for all major proteins, as are a large sequence database (including a genome sequence) and effective genetic systems exist for some cyanobacteria. Recent studies on subunit interaction, covalent modification, and protein stability suggest a model for the earliest events in the phycobilisome assembly pathway. Partitioning of phycobilisome proteins between degradation and assembly is proposed to be controlled by the interaction equilibria between phycobilisome assembly partners, processing enzymes and chaperones. The model provides plausible explanations for existing observations and makes predictions that are amenable to direct experimental investigation.|Bacterial Proteins/*chemistry[MESH]|Cyanobacteria/*metabolism[MESH]|Gene Expression Regulation, Bacterial/genetics[MESH]|Light-Harvesting Protein Complexes[MESH]|Microscopy, Electron[MESH]|Mutation/genetics[MESH]|Photosynthetic Reaction Center Complex Proteins/chemistry[MESH]|Phycobilisomes[MESH]|Plant Proteins/*chemistry[MESH] |
