InterPro domain: IPR029981

Trichome birefringence-like (TBL) proteins are proposed to encode wall poly-saccharide specific O-acetyltransferases based on the existing data for some members of the TBL family: altered xyloglucan 4 (AXY4/TBL270) and altered xyloglucan 4-like (AXY4L/TBL22), two xyloglucan specific O-acetyltransferases in non-seed tissues and seeds, respectively [ 1 , 2 ].

This entry represents the PMR5 protein, also known as protein trichome birefringence-like 44 (TBL44). PMR5 is thought to be involved in pectin methyl esterification or O-acetylation [ 3 ]. It is involved in non-host resistance (NHR) or plant immunity to non-adapted pathogen species [ 4 ].

1. O-acetylation of Arabidopsis hemicellulose xyloglucan requires AXY4 or AXY4L, proteins with a TBL and DUF231 domain. Plant Cell 23, 4041-53
2. Involvement of TBL/DUF231 proteins into cell wall biology. Plant Signal Behav 5, 1057-9
3. Mutations in PMR5 result in powdery mildew resistance and altered cell wall composition. Plant J. 40, 968-78
4. AGB1 and PMR5 contribute to PEN2-mediated preinvasion resistance to Magnaporthe oryzae in Arabidopsis thaliana. Mol. Plant Microbe Interact. 22, 1331-40