Figure 12.

Proposed model for the core asparagus XSC in the GA. The asparagus XSC contains homodimers of IRX9, IRX10, and IRX14A with potential interaction partner(s). AoIRX9 and AoIRX14 form heterodimers that are anchored to the GA membrane, with their C termini facing the Golgi lumen. AoIRX10 is located in the Golgi lumen and lacks a transmembrane domain. The shapes with question marks indicate other interacting proteins that may act to bridge IRX10 to IRX9 and IRX14A. We postulate that perhaps IRX14 performs the initial priming reaction, thereby facilitating subsequent xylan XylT activity by IRX10 within the Golgi lumen.