This family includes homologues of the PIF1 helicase, which inhibits telomerase activity and is cell cycle regulated [1-4]. This family includes a large number of largely uncharacterised plant proteins. This entry includes a P-loop motif that is involved in nucleotide binding.

1: Human PIF helicase is cell cycle regulated and associates with telomerase. Mateyak MK, Zakian VA; Cell Cycle. 2006;5:2796-2804. PMID:17172855

2: The human Pif1 helicase, a potential Escherichia coli RecD homologue, inhibits telomerase activity. Zhang DH, Zhou B, Huang Y, Xu LX, Zhou JQ; Nucleic Acids Res. 2006;34:1393-1404. PMID:16522649

3: Structural and functional analysis of the nucleotide and DNA binding activities of the human PIF1 helicase. Dehghani-Tafti S, Levdikov V, Antson AA, Bax B, Sanders CM; Nucleic Acids Res. 2019;47:3208-3222. PMID:30698796

4: Insights into the structural and mechanistic basis of multifunctional S. cerevisiae Pif1p helicase. Lu KY, Chen WF, Rety S, Liu NN, Wu WQ, Dai YX, Li D, Ma HY, Dou SX, Xi XG; Nucleic Acids Res. 2018;46:1486-1500. PMID:29202194