second of two ATPase domains of NVL (nuclear VCP-like protein) and similar ATPase domains
NVL exists in two forms with N-terminal extensions of different lengths in mammalian cells. NVL has two alternatively spliced isoforms, a short form, NVL1, and a long form, NVL2. NVL2, the major species, is mainly present in the nucleolus, whereas NVL1 is nucleoplasmic. Each has an N-terminal domain, followed by two tandem ATPase domains; this subfamily includes the first of the two ATPase domains. NVL2 is involved in the biogenesis of the 60S ribosome subunit by associating specifically with ribosome protein L5 and modulating the function of DOB1. NVL2 is also required for telomerase assembly and the regulation of telomerase activity, and is involved in pre-rRNA processing. The role of NVL1 is unclear. This RecA-like_NVL_r1-like subfamily belongs to the RecA-like NTPase family which includes the NTP binding domain of F1 and V1 H(+)ATPases, DnaB and related helicases as well as bacterial RecA and related eukaryotic and archaeal recombinases. The RecA-like NTPase family also includes bacterial conjugation proteins and related DNA transfer proteins involved in type II and type IV secretion.