The protozoan parasite Cryptosporidium parvum possesses two functionally and evolutionarily divergent replication protein A large subunits

S. Dean Rider, Xiaomin Cai, William Sullivan, Aaron T. Smith, Jay Radke, Michael White, Guan Zhu

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Very little is known about protozoan replication protein A (RPA), a heterotrimeric complex critical for DNA replication and repair. We have discovered that in medically and economically important apicomplexan parasites, two unique RPA complexes may exist based on two different types of large subunit RPA1. In this study, we characterized the single-stranded DNA binding features of two distinct types (i.e. short and long) of RPA1 subunits from Cryptosporidium parvum (CpRPA1A and CpRPA1B). These two proteins differ from human RPA1 in their intrinsic single-stranded DNA binding affinity (K) and have significantly lower cooperativity (ω). We also identified the RPA2 and RPA3 subunits from C. parvum, the latter of which had yet to be reported to exist in any protozoan. Using fluorescence resonance energy transfer technology and pull-down assays, we confirmed that these two subunits interact with each other and with CpRPA1A and CpRPA1B. This suggests that the heterotrimeric structure of RPA complexes may be universally conserved from lower to higher eukaryotes. Bioinformatic analyses indicate that multiple types of RPA1 are present in the other apicomplexans Plasmodium and Toxoplasma. Apicomplexan RPA1 proteins are phylogenetically more related to plant homologues and probably arose from a single gene duplication event prior to the expansion of the apicomplexan lineage. Differential expression during the life cycle stages in three apicomplexan parasites suggests that the two RPA1 types exercise specialized biological functions.

Original languageEnglish
Pages (from-to)31460-31469
Number of pages10
JournalJournal of Biological Chemistry
Volume280
Issue number36
DOIs
StatePublished - Sep 9 2005

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Replication Protein A
Cryptosporidium parvum
Parasites
Single-Stranded DNA
Protozoan Proteins
Fluorescence Resonance Energy Transfer
Gene Duplication
Plasmodium
Toxoplasma
Bioinformatics
Life Cycle Stages
Computational Biology
Eukaryota
DNA Replication
DNA Repair
Life cycle
Assays
Repair
Genes
Technology

ASJC Scopus subject areas

  • Biochemistry

Cite this

The protozoan parasite Cryptosporidium parvum possesses two functionally and evolutionarily divergent replication protein A large subunits. / Rider, S. Dean; Cai, Xiaomin; Sullivan, William; Smith, Aaron T.; Radke, Jay; White, Michael; Zhu, Guan.

In: Journal of Biological Chemistry, Vol. 280, No. 36, 09.09.2005, p. 31460-31469.

Research output: Contribution to journalArticle

Rider, S. Dean ; Cai, Xiaomin ; Sullivan, William ; Smith, Aaron T. ; Radke, Jay ; White, Michael ; Zhu, Guan. / The protozoan parasite Cryptosporidium parvum possesses two functionally and evolutionarily divergent replication protein A large subunits. In: Journal of Biological Chemistry. 2005 ; Vol. 280, No. 36. pp. 31460-31469.
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