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hydroxyproline-rich glycoprotein family protein;(source:Araport11)
TAIR Curator Summary
Encodes a proline-rich protein SICKLE (SIC). Required for development and abiotic stress tolerance. Involved in microRNA biogenesis. It is involved in mRNA splicing. It is a single copy gene in Arabidopsis and likely specific to higher plants. Along with RCN1, it functions in regulating auxin transport processes in part by regulating the recycling of PIN1 and PIN2 auxin transporters. It is required for circadian clock temperature responses.
Localized in the shoot apical meristem (SAM) dome, the emerging leaf and root primordia, the provascular strands of developing seedlings, and the epidermis and cortex of the meristematic and elongation zones of the primary root tip, and in the protoderm of heart- and torpedo- stage embryos.
Involved in miRNAs and siRNAs biogenesis and thus promotes gene silencing (PubMed:23071326). Modulates auxin (IAA) transport-related developmental programs by regulating protein phosphatase 2A (PP2As)-driven auxin efflux carrier PIN proteins recycling and polarity (PubMed:26888284). Required during development (PubMed:23071326, PubMed:26888284). Necessary for abiotic stress (e.g. chilling and salt) tolerance (PubMed:23071326).
Colocalizes with miRNA biogenesis components in distinct subnuclear bodies (PubMed:23071326). Localized in the nuclei, excluding the nucleolus, in all cells of the root apical meristem. In young cortical cells of the root, localized in the nucleus and cytosol (PubMed:26888284).