TY - JOUR
T1 - Mitochondrial origin-binding protein UMSBP mediates DNA replication and segregation in trypanosomes
AU - Milman, Neta
AU - Motyka, Shawn A.
AU - Englund, Paul T.
AU - Robinson, Derrick
AU - Shlomai, Joseph
PY - 2007/12/4
Y1 - 2007/12/4
N2 - 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.
AB - 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.
KW - Kinetoplast DNA
KW - Trypanosomes cell cycle control
KW - Universal minicircle sequence-binding protein
KW - kDNA replication initiation
KW - kDNA segregation
UR - http://www.scopus.com/inward/record.url?scp=37649011187&partnerID=8YFLogxK
U2 - 10.1073/pnas.0706858104
DO - 10.1073/pnas.0706858104
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C2 - 18048338
AN - SCOPUS:37649011187
SN - 0027-8424
VL - 104
SP - 19250
EP - 19255
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 49
ER -