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TitleConformational variability of cyanobacterial ChlI, the AAA+ motor of magnesium chelatase involved in chlorophyll biosynthesis.
Journal, issue, pagesmBio, Vol. 14, Issue 5, Page e0189323, Year 2023
Publish dateSep 22, 2023
AuthorsDmitry Shvarev / Alischa Ira Scholz / Arne Moeller /
PubMed AbstractPhotosynthesis is an essential life process that relies on chlorophyll. In photosynthetic organisms, chlorophyll synthesis involves multiple steps and depends on magnesium chelatase. This enzyme ...Photosynthesis is an essential life process that relies on chlorophyll. In photosynthetic organisms, chlorophyll synthesis involves multiple steps and depends on magnesium chelatase. This enzyme complex is responsible for inserting magnesium into the chlorophyll precursor, but the molecular mechanism of this process is not fully understood. By using cryogenic electron microscopy and conducting functional analyses, we have discovered that the motor subunit ChlI of magnesium chelatase undergoes conformational changes in the presence of ATP. Our findings offer new insights into how energy is transferred from ChlI to the other components of magnesium chelatase. This information significantly contributes to our understanding of the initial step in chlorophyll biosynthesis and lays the foundation for future studies on the entire process of chlorophyll production.
External linksmBio / PubMed:37737632 / PubMed Central
MethodsEM (single particle)
Resolution3.8 - 4.9 Å
Structure data

17151

8osf

EMDB-17151, PDB-8osf:
AAA+ motor subunit ChlI of magnesium chelatase, hexamer conformation A
Method: EM (single particle) / Resolution: 4.0 Å

17152

8osg

EMDB-17152, PDB-8osg:
AAA+ motor subunit ChlI of magnesium chelatase, hexamer conformation B
Method: EM (single particle) / Resolution: 3.8 Å

17153

8osh

EMDB-17153, PDB-8osh:
AAA+ motor subunit ChlI of magnesium chelatase, pentamer spring-washer-like conformation
Method: EM (single particle) / Resolution: 4.9 Å

Chemicals

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM / Adenosine triphosphate

ChemComp-MG:
Unknown entry

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM / Adenosine diphosphate

Source
  • nostoc sp. pcc 7120 = fachb-418 (bacteria)
KeywordsPHOTOSYNTHESIS / AAA+ / Magnesium Chelatase / Cyanobacteria

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