Identification of an S-RNase binding protein1 (SBP1) homolog of apple (Malus×domestica)

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  • Identification of an S-RNase binding protein1 (SBP1) homolog of apple (<i>Malus</i>×<i>domestica</i>)
  • Identification of an S-RNase binding protein1 (SBP1) homolog of apple (Malus^|^times;domestica)
  • Identification of an S-RNase binding protein1 (SBP1) homolog of apple (<italic>Malus</italic> × <italic>domestica</italic>)

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Many flowering plants exhibit self-incompatibility (SI) to prevent inbreeding and promote outcrossing. This self/non-self discrimination mechanism is controlled by the S locus, which contains separate genes for pistil and pollen specificities. In the gametophytic SI (GSI) of Rosaceae, Solanaceae and Plantaginaceae, the pistil S determinant, S-RNase, encodes extracellular ribonuclease which is thought to act as a cytotoxin to the self pollen tube, while the pollen S determinant is the F-box gene called SLF/SFB/SFBB. In Petunia (Solanaceae), SLF is reported to be a component of the noncanonical E3 ubiquitin ligase complex with S-RNase binding protein1 (SBP1) and Cullin1 (CUL1), and interact with non-self S-RNases to ubiquitinate them for degradation. Here, we isolated an apple (Malus×domestica) homolog of SBP1 (MdSBP1) from pollen RNA by RT-PCR. MdSBP1 included a RING-HC domain required for E3 ubiquitin ligase activity, and showed 64.0–68.2% amino acid identities with solanaceous SBP1 proteins. Expression analysis showed that MdSBP1 was expressed in all the organs analyzed. We detected an interaction between recombinant MdSBP1 protein and S-RNase of apple using a pull-down assay.

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