This P-loop motif-containing family of proteins includes AFG1, LACE1 and ZapE. ATPase family gene 1 (AFG1) is a 377 amino acid yeast protein with an ATPase motif typical of the family [1]. LACE1, the mammalian homologue of AFG1, is a mitochondrial integral membrane protein that is essential for maintenance of fused mitochondrial reticulum and lamellar cristae morphology. It has also been demonstrated that LACE1 mediates degradation of nuclear-encoded complex IV subunits COX4 (cytochrome c oxidase 4), COX5A and COX6A, and is required for normal activity of complexes III and IV of the respiratory chain [2]. ZapE is a cell division protein found in Gram-negative bacteria. The bacterial cell division process relies on the assembly, positioning, and constriction of FtsZ ring (the so-called Z-ring), a ring-like network that marks the future site of the septum of bacterial cell division. ZapE is a Z-ring associated protein required for cell division under low-oxygen conditions. It is an ATPase that appears at the constricting Z-ring late in cell division. It reduces the stability of FtsZ polymers in the presence of ATP in vitro [3].

1: AFG1, a new member of the SEC18-NSF, PAS1, CDC48-VCP, TBP family of ATPases. Lee YJ, Wickner RB; Yeast 1992;8:787-790. PMID:1441755

2: The mammalian homologue of yeast Afg1 ATPase (lactation elevated 1) mediates degradation of nuclear-encoded complex IV subunits. Cesnekova J, Rodinova M, Hansikova H, Houstek J, Zeman J, Stiburek L; Biochem J. 2016;473:797-804. PMID:26759378

3: ZapE is a novel cell division protein interacting with FtsZ and modulating the Z-ring dynamics. Marteyn BS, Karimova G, Fenton AK, Gazi AD, West N, Touqui L, Prevost MC, Betton JM, Poyraz O, Ladant D, Gerdes K, Sansonetti PJ, Tang CM; MBio. 2014;5:e00022-e00014. PMID:24595368