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TitleDephosphorylation and ion binding in prokaryotic calcium transport.
Journal, issue, pagesSci Adv, Vol. 10, Issue 41, Page eadp2916, Year 2024
Publish dateOct 11, 2024
AuthorsIrfan Prabudiansyah / Fredrik Orädd / Konstantinos Magkakis / Kevin Pounot / Matteo Levantino / Magnus Andersson /
PubMed AbstractCalcium (Ca) signaling is fundamental to cellular processes in both eukaryotic and prokaryotic organisms. While the mechanisms underlying eukaryotic Ca transport are well documented, an understanding ...Calcium (Ca) signaling is fundamental to cellular processes in both eukaryotic and prokaryotic organisms. While the mechanisms underlying eukaryotic Ca transport are well documented, an understanding of prokaryotic transport remains nascent. LMCA1, a Ca adenosine triphosphatase (ATPase) from , has emerged as a prototype for elucidating structure and dynamics in prokaryotic Ca transport. Here, we used a multidisciplinary approach integrating kinetics, structure, and dynamics to unravel the intricacies of LMCA1 function. A cryo-electron microscopy (cryo-EM) structure of a Ca-bound E1 state showed ion coordination by Asp, Asn, and Glu. Time-resolved x-ray solution scattering experiments identified phosphorylation as the rate-determining step. A cryo-EM E2P state structure exhibited remarkable similarities to a SERCA1a E2-P* state, which highlights the essential role of the unique P-A domain interface in enhancing dephosphorylation rates and reconciles earlier proposed mechanisms. Our study underscores the distinctiveness between eukaryotic and prokaryotic Ca ATPase transport systems and positions LMCA1 as a promising drug target for developing antimicrobial strategies.
External linksSci Adv / PubMed:39908574 / PubMed Central
MethodsEM (single particle)
Resolution2.98 - 3.73 Å
Structure data

EMDB-19980, PDB-9euq:
CryoEM structure of LMCA1 in E2P state
Method: EM (single particle) / Resolution: 2.98 Å

EMDB-19998, PDB-9evc:
CryoEM structure of LMCA1 in E1-Ca state
Method: EM (single particle) / Resolution: 3.73 Å

Chemicals

ChemComp-MG:
Unknown entry

ChemComp-BEF:
BERYLLIUM TRIFLUORIDE ION

ChemComp-CA:
Unknown entry

Source
  • listeria monocytogenes (bacteria)
KeywordsMEMBRANE PROTEIN / transporter

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