Binding of the Universal Minicircle Sequence Binding Protein at the Kinetoplast DNA Replication Origin

Kinetoplast DNA, the mitochondrial DNA of trypanosomatids, is a remarkable DNA structure that contains, in the species Crithidia fasciculata, 5000 topologically linked duplex DNA minicircles. Their replication initiates at two conserved sequences, a dodecamer, known as the universal minicircle seque...

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Bibliographic Details
Published in:The Journal of biological chemistry 2006-12, Vol.281 (49), p.37468-37476
Main Authors: Onn, Itay, Kapeller, Irit, Abu-Elneel, Kawther, Shlomai, Joseph
Format: Article
Language:English
Subjects:
Animals
Base Sequence
Binding Sites - genetics
Crithidia fasciculata
Crithidia fasciculata - genetics
Crithidia fasciculata - metabolism
DNA, Kinetoplast - chemistry
DNA, Kinetoplast - genetics
DNA, Kinetoplast - metabolism
DNA-Binding Proteins - metabolism
Nucleic Acid Conformation
Protein Binding
Protozoan Proteins - metabolism
Replication Origin
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Summary:Kinetoplast DNA, the mitochondrial DNA of trypanosomatids, is a remarkable DNA structure that contains, in the species Crithidia fasciculata, 5000 topologically linked duplex DNA minicircles. Their replication initiates at two conserved sequences, a dodecamer, known as the universal minicircle sequence (UMS), and a hexamer, which are located at the replication origins of the minicircle L and H strands, respectively. A UMS-binding protein (UMSBP) binds specifically the 12-mer UMS sequence and a 14-mer sequence that contains the conserved hexamer in their single-stranded DNA conformation. In vivo cross-linking analyses reveal the binding of UMSBP to kinetoplast DNA networks in the cell. Furthermore, UMSBP binds in vitro to native minicircle origin fragments, carrying the UMSBP recognition sequences. UMSBP binding at the replication origin induces conformational changes in the bound DNA through its folding, aggregation and condensation.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.M606374200