proteasome activating nucleotidase PAN and related proteasome subunits
This subfamily contains ATPase subunits of the eukaryotic 26S proteasome, and of the archaeal proteasome which carry out ATP-dependent degradation of substrates of the ubiquitin-proteasome pathway. The eukaryotic 26S proteasome consists of a proteolytic 20S core particle (CP), and a 19S regulatory particle (RP) which provides the ATP-dependence and the specificity for ubiquitinated proteins. In the archaea the RP is a homohexameric complex of proteasome-activating nucleotidase (PAN). This subfamily also includes various eukaryotic 26S subunits including, proteasome 26S subunit, ATPase 2 (PSMC2, also known as S7 and MSS1) which is a member of the 19S RP and has a chaperone like activity; and proteasome 20S subunit alpha 6 (PSMA6, also known as IOTA, p27K, and PROS27) which is a member of the 20S CP. This RecA-like_PAN 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.
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