Universal minicircle sequence binding protein, a CCHC-type zinc finger protein that binds the universal minicircle sequence of trypanosomatids: Purification and characterization

Yehuda Tzfati, Hagai Abeliovich, Dana Avrahami, Joseph Shlomai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Replication of kinetoplast DNA minicircles of trypanosomatids initiates at a conserved 12-nucleotide sequence, termed the universal minicircle sequence (UMS, 5′-GGGGTTGGTGTA-3′). A single-stranded nucleic acid binding protein that binds specifically to this origin-associated sequence was purified to apparent homogeneity from Crithidia fasciculata cell extracts. This UMS-binding protein (UMSBP) is a dimer of 27.4 kDa with a 13.7-kDa protomer. UMSBP binds single-stranded DNA as well as single-stranded RNA but not double-stranded or four-stranded DNA structures. Stoichiometry analysis indicates the binding of UMSBP as a protein dimer to the UMS site. The five CCHC-type zinc finger motifs of UMSBP, predicted from its cDNA sequence, are similar to the CCHC motifs found in retroviral Gag polyproteins. The remarkable conservation of this motif in a family of proteins found in eukaryotic organisms from yeast and protozoa to mammals is discussed.

Original languageAmerican English
Pages (from-to)21339-21345
Number of pages7
JournalJournal of Biological Chemistry
Volume270
Issue number36
StatePublished - 8 Sep 1995

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