RGD Reference Report - A rat RuvB-like protein, TIP49a, is a germ cell-enriched novel DNA helicase. - Rat Genome Database

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A rat RuvB-like protein, TIP49a, is a germ cell-enriched novel DNA helicase.

Authors: Makino, Y  Kanemaki, M  Kurokawa, Y  Koji, T  Tamura, T 
Citation: Makino Y, etal., J Biol Chem 1999 May 28;274(22):15329-35.
RGD ID: 729809
Pubmed: PMID:10336418   (View Abstract at PubMed)

We have isolated a novel nuclear protein with a molecular mass of 49 kDa (TIP49a) from rat liver. The rat TIP49a showed structural resemblance to several bacterial RuvBs and also displayed Walker A and B motifs. We overproduced the recombinant TIP49a in Escherichia coli and purified it to near homogeneity. Biochemical investigations demonstrated that TIP49a possessed ATPase activity that was stimulated by single-stranded DNA but neither by double-stranded DNA nor by any forms of RNA polymers tested. Moreover, a UV cross-linking assay indicated TIP49a specifically interacted with ATP. Interestingly, we found that DNA duplex was unwound by the recombinant TIP49a in the presence of ATP or dATP. Optimal concentrations of ATP and Mg2+ for the helicase activity were 1-2 mM and 0.25-1 mM, respectively. Displacement of the DNA strand occurred in the 3' to 5' direction with respect to the single-stranded DNA flanking the duplex. Western blot analysis revealed that TIP49a was abundantly expressed in testes and moderately in spleen, thymus, and lung. In mouse seminiferous tubules, the protein was restrictively observed in germ lineages from late pachytene spermatocytes to round spermatids. From these observations, we propose that TIP49a is a novel DNA helicase and may play a role in nuclear processes such as recombination and transcription.

Gene Ontology Annotations    Click to see Annotation Detail View

Molecular Function
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
3'-5' DNA helicase activity  IDA 729809 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Ruvbl1  (RuvB-like AAA ATPase 1)


Additional Information