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3.A.1.140.1
The FtsX/FtsE ABC transporter (Arends et al., 2009) (FtsX is of the type III topology). FtsEX directly recruits EnvC to the septum via an interaction between EnvC and a periplasmic loop of FtsX. FtsEX variants predicted to be ATPase defective still recruit EnvC to the septum but fail to promote cell separation. Amidase activation via EnvC in the periplasm is regulated by conformational changes in the FtsEX complex mediated by ATP hydrolysis in the cytoplasm. Since FtsE has been reported to interact with FtsZ, amidase activity may be coupled with the contraction of the FtsZ cytoskeletal ring (Yang et al., 2011).  The hydrolysis of septal PG (sPG) is a crucial step of bacterial cell division, facilitated by FtsEX through an amidase activation system. Chen et al. 2024 presented the cryo-EM structures of Escherichia coli FtsEX and FtsEX-EnvC in the ATP-bound state at resolutions of 3.05 Å and 3.11 Å, respectively. The PG degradation assays in E. coli revealed that the ATP-bound conformation of FtsEX activates sPG hydrolysis of EnvC-AmiB, whereas EnvC-AmiB alone exhibits autoinhibition. Structural analyses indicate that ATP binding induces conformational changes in FtsEX-EnvC. PG degradation assays of AmiB mutants confirm that the regulation of AmiB by FtsEX-EnvC is achieved through the interaction between EnvC-AmiB. These findings provide structural insight into the mechanism of sPG hydrolysis and bacterial cell division (Chen et al. 2024).

Accession Number:P0AC31
Protein Name:Cell division protein ftsX
Length:352
Molecular Weight:38544.00
Species:Escherichia coli [217992]
Number of TMSs:4
Location1 / Topology2 / Orientation3: Cell inner membrane1 / Multi-pass membrane protein2
Substrate

Cross database links:

RefSeq: NP_756117.2   
Entrez Gene ID: 1037013   
Pfam: PF02687   
KEGG: ecc:c4255   

Gene Ontology

GO:0016021 C:integral to membrane
GO:0005886 C:plasma membrane
GO:0007049 P:cell cycle
GO:0051301 P:cell division

References (1)

[1] “Extensive mosaic structure revealed by the complete genome sequence of uropathogenic Escherichia coli.”  Welch R.A.et.al.   12471157

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MNKRDAINHI RQFGGRLDRF RKSVGGSGDG GRNAPKRAKS SPKPVNRKTN VFNEQVRYAF 
61:	HGALQDLKSK PFATFLTVMV IAISLTLPSV CYMVYKNVNQ AATQYYPSPQ ITVYLQKTLD 
121:	DDAAAGVVAQ LQAEQGVEKV NYLSREDALG EFRNWSGFGG ALDMLEENPL PAVAVVIPKL 
181:	DFQGTESLNT LRDRITQING IDEVRMDDSW FARLAALTGL VGRVSAMIGV LMVAAVFLVI 
241:	GNSVRLSIFA RRDSINVQKL IGATDGFILR PFLYGGALLG FSGALLSLIL SEILVLRLSS 
301:	AVAEVAQVFG TKFDINGLSF DECLLLLLVC SMIGWVAAWL ATVQHLRHFT PE