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Single particle cryo-EM analysis of Rickettsia conorii Sca2 reveals a formin-like core

J Struct Biol. 2023-04; 
Peter J Carman, Grzegorz Rebowski, Roberto Dominguez, Saif S Alqassim
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Proteins, Expression, Isolation and Analysis … , and an engineered C-terminal Strep tag (Genscript Inc.). Sca2 was expressed in Escherichia … Using negative-stain TEM screening, we found it was necessary to use glycerol gradient … Get A Quote

摘要

Spotted fever group Rickettsia undergo actin-based motility inside infected eukaryotic cells using Sca2 (surface cell antigen 2): an?~?1800 amino-acid monomeric autotransporter protein that is surface-attached to the bacterium and responsible for the assembly of long unbranched actin tails. Sca2 is the only known functional mimic of eukaryotic formins, yet it shares no sequence similarities to the latter. Using structural and biochemical approaches we have previously shown that Sca2 uses a novel actin assembly mechanism. The first?~?400 amino acids fold into helix-loop-helix repeats that form a crescent shape reminiscent of a formin FH2 monomer. Additionally, the N- and C- terminal halves of Sca2 displa... More

關鍵詞

Actin assembly, Autotransporter, FH2, Formin, Spotted fever group Rickettsia
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