Onset of grain filling is associated with a change in properties of linker histone variants in maize kernels

R. Kalamajka, Christine Finnie, K.D. Grasser

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    In maize kernel development, the onset of grain-filling represents a major developmental switch that correlates with a massive reprogramming of gene expression. We have isolated chromosomal linker histones from developing maize kernels before (11 days after pollination, dap) and after (16 dap) initiation of storage synthesis. Six linker histone gene products were identified by MALDI-TOF mass spectrometry. A marked shift of around 4 pH units was observed for the linker histone spot pattern after 2D-gel electrophoresis when comparing the proteins of 11 and 16 dap kernels. The shift from acidic to more basic protein forms suggests a reduction in the level of post-translational modifications of linker histones during kernel development. Analysis of their DNA-binding affinity revealed that the different linker histone gene products bind double-stranded DNA with similar affinity. Interestingly, the linker histones isolated from 16 dap kernels consistently displayed a lower affinity for DNA than the proteins isolated from 11 dap kernels. These findings suggest that the affinity for DNA of the linker histones may be regulated by post-translational modification and that the reduction in DNA affinity could be involved in a more open chromatin during storage synthesis.
    Original languageEnglish
    JournalPlanta
    Volume231
    Issue number5
    Pages (from-to)1127-1135
    ISSN0032-0935
    DOIs
    Publication statusPublished - 2010

    Keywords

    • Linker histone
    • Chromatin
    • H1
    • 2D-gel electrophoresis
    • DNA interaction

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