| Type: | Domain | Name: | UvrD-like DNA helicase, C-terminal |
| Description: | Helicases have been classified in 5 superfamilies (SF1-SF5) []. All of the proteins bind ATP and, consequently, all of them carry the classical Walker A (phosphate-binding loop or P-loop), and Walker B (Mg2+-binding aspartic acid) motifs []. For the two largest groups, commonly referred to as SF1 and SF2, a total of seven characteristic motifs have been identified [] which are distributed over two structural domains, an N-terminal ATP-binding domain and a C-terminal domain.This entry represents the C-terminal domain.UvrD-like DNA helicases belong to SF1, but they differ from classical SF1/SF2 by a large insertion in each domain. UvrD-like DNA helicases unwind DNA with a 3'-5' polarity []. Crystal structures of several uvrD-like DNA helicases have been solved [, , ]. They are monomeric enzymes consisting of two domains with a common alpha-beta RecA-like core. The ATP-binding site is situated in a cleft between the N terminus of the ATP-binding domain and the beginning of the C-terminal domain. The enzyme crystallizes in two different conformations (open and closed). The conformational difference between the two forms comprises a large rotation of the end of the C-terminal domain by approximately 130 degrees. This "domain swiveling" was proposed to be an important aspect of the mechanism of the enzyme [].Some proteins that belong to the uvrD-like DNA helicase family are listed below: Bacterial UvrD helicase. It is involved in the post-incision events of nucleotide excision repair and methyl-directed mismatch repair. It unwinds DNA duplexes with 3'-5' polarity with respect to the bound strand and initiates unwinding most effectively when a single-stranded region is present.Gram-positive bacterial pcrA helicase, an essential enzyme involved in DNA repair and rolling circle replication. The Staphylococcus aureuspcrA helicase has both 5'-3' and 3'-5' helicase activities. Bacterial rep proteins, a single-stranded DNA-dependent ATPase involved in DNA replication which can initiate unwinding at a nick in the DNA. It binds to the single-stranded DNA and acts in a progressive fashion along the DNA in the 3' to 5' direction.Bacterial helicase IV (helD gene product). It catalyzes the unwinding of duplex DNA in the 3'-5' direction.Bacterial recB protein. RecBCD is a multi-functional enzyme complex that processes DNA ends resulting from a double-strand break. RecB is a helicase with a 3'-5' directionality.Fungal srs2 proteins, an ATP-dependent DNA helicase involved in DNA repair. The polarity of the helicase activity was determined to be 3'-5'. | Short Name: | DNA_helicase_UvrD-like_C |
| DB identifier | Type | Name |
|---|---|---|
| IPR000212 | Family | DNA helicase, UvrD/REP type |
| IPR004586 | Family | RecBCD enzyme subunit RecB |
| IPR005752 | Family | ATP-dependent DNA helicase Rep |
| IPR005751 | Family | ATP-dependent DNA helicase PcrA |
| IPR005753 | Family | DNA helicase, ATP-dependent, UvrD type |
| IPR014140 | Family | DNA helicase subunit AddB |
| IPR014151 | Family | DNA helicase (double-strand break repair), AddA type |
| IPR014152 | Family | DNA helicase subunit AddA |
