Characterisation and high-resolution distribution of a matrix attachment region-binding protein (MFP1) in proliferating cells of onion

Rafael Samaniego, Wendou Yu, Iris Meier, Susana Moreno Díaz

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The first matrix attachment region (MAR)-binding protein sequenced in plants, MFP1, has been characterised in two dicot species. Based on their antigenic relationship, we report here the conservation of MFP1-like proteins in proliferating root cells of onion (Allium cepa L). Two MFP1-like proteins with different molecular masses and solubilities were detected. The most abundant was a 90-kDa basic protein, presenting several separate spots in two-dimensional blots. The MFP1 was partially soluble and, similar to the proliferating cell nuclear antigen (PCNA)-labelled replication factories in the nucleus and nuclear matrix, was localised at discrete foci as detected by confocal microscopy. High-resolution immunolocalisation of MFP1 by electron microscopy identified the foci as nuclear structures, some of them containing PCNA, which are ultrastructurally similar to the replication factories described in animal cells. Our data provide the first report on MFP1-like proteins in the Alliaceae. In addition, we present evidence of the presence of AcMFP1 in the putative replication factories.

Original languageEnglish (US)
Pages (from-to)535-546
Number of pages12
JournalPlanta
Volume212
Issue number4
DOIs
StatePublished - 2001

Keywords

  • AcMFP1
  • Allium (nuclear matrix)
  • Matrix attachment region-binding protein
  • Nuclear matrix
  • Nuclear protein (AcMFP1)
  • Nucleic acid metabolism

ASJC Scopus subject areas

  • Genetics
  • Plant Science

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