Mitochondrial origin-binding protein UMSBP mediates DNA replication and segregation in trypanosomes

Neta Milman, Shawn A. Motyka, Paul T. Englund, Derrick Robinson, Joseph Shlomai

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Kinetoplast DNA (kDNA) is the remarkable mitochondrial genome of trypanosomatids. Its major components are several thousands of topologically linked DNA minicircles, whose replication origins are bound by the universal minicircle sequence-binding protein (UMSBP). The cellular function of UMSBP has been studied in Trypanosoma brucei by using RNAi analysis. Silencing of the trypanosomal UMSBP genes resulted in remarkable effects on the trypanosome cell cycle. It significantly inhibited the initiation of minicircle replication, blocked nuclear DNA division, and impaired the segregation of the kDNA network and the flagellar basal body, resulting in growth arrest. These observations, revealing the function of UMSBP in kDNA replication initiation and segregation as well as in mitochondrial and nuclear division, imply a potential role for UMSBP in linking kDNA replication and segregation to the nuclear S-phase control during the trypanosome cell cycle.

Original languageEnglish (US)
Pages (from-to)19250-19255
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number49
StatePublished - Dec 4 2007
Externally publishedYes


  • Kinetoplast DNA
  • Trypanosomes cell cycle control
  • Universal minicircle sequence-binding protein
  • kDNA replication initiation
  • kDNA segregation

ASJC Scopus subject areas

  • General


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