The absence of supercoiling in kinetoplast DNA minicircles.
نویسندگان
چکیده
منابع مشابه
The attachment of minicircles to kinetoplast DNA networks during replication.
Kinetoplast DNA (kDNA), the trypanosomatid mitochondrial DNA, is a network containing several thousand interlocked minicircles. During kDNA synthesis, minicircles dissociate from the network, and after replication their progeny reattach to the network periphery. Using electron microscopy autoradiography, we found that newly synthesized 3H-labeled minicircles, after short labeling periods, are c...
متن کاملSequences of two kinetoplast DNA minicircles of Tryptanosoma brucei.
Kinetoplast DNA of Trypanosoma brucei is composed of a network of about 10,000 interlocked minicircle DNA molecules (1.0 kilobase) that are catenated with about 50 maxicircle DNA molecules (23 kilobases). Several different DNA . DNA hybridization techniques using individual minicircle DNA sequences cloned in Escherichia coli have indicated that each minicircle molecule contains about one-fourth...
متن کاملGenomic organization of Trypanosoma brucei kinetoplast DNA minicircles.
The sequences of seven new Trypanosoma brucei kinetoplast DNA minicircles were obtained. A detailed comparative analysis of these sequences and those of the 18 complete kDNA minicircle sequences from T. brucei available in the database was performed. These 25 different minicircles contain 86 putative gRNA genes. The number of gRNA genes per minicircle varies from 2 to 5. In most cases, the gene...
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Previous work has shown that the kinetoplast minicircle DNA of Leishmania species exhibits species-specific sequence divergence and this observation has led to the development of a DNA probe-based diagnostic test for leishmaniasis. In the work reported here, we demonstrate that the minicircle is composed of three types of DNA sequences with differing specificities reflecting different rates of ...
متن کاملEnzymatic mechanism controls redox-mediated protein-DNA interactions at the replication origin of kinetoplast DNA minicircles.
Kinetoplast DNA (kDNA) is the mitochondrial DNA of trypanosomatids. Its major components are several thousand topologically interlocked DNA minicircles. Their replication origins are recognized by universal minicircle sequence-binding protein (UMSBP), a CCHC-type zinc finger protein, which has been implicated with minicircle replication initiation and kDNA segregation. Interactions of UMSBP wit...
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ژورنال
عنوان ژورنال: The EMBO Journal
سال: 1993
ISSN: 0261-4189
DOI: 10.1002/j.1460-2075.1993.tb05672.x