Proteins in this family are involved in the regulation of 1,3-beta-glucan synthase activity and cell-wall formation [1][2]. Genome contextual information showed that SMI1 are primary immunity proteins in bacterial toxin systems [3].

1: Cloning and characterization of a Neurospora crassa gene required for (1,3) beta-glucan synthase activity and cell wall formation. Enderlin CS, Selitrennikoff CP; Proc Natl Acad Sci U S A. 1994;91:9500-9504. PMID:7937796

2: Cloning and characterization of KNR4, a yeast gene involved in (1,3)-beta-glucan synthesis. Hong Z, Mann P, Brown NH, Tran LE, Shaw KJ, Hare RS, DiDomenico B; Mol Cell Biol. 1994;14:1017-1025. PMID:8289782

3: A novel immunity system for bacterial nucleic acid degrading toxins and its recruitment in various eukaryotic and DNA viral systems. Zhang D, Iyer LM, Aravind L; Nucleic Acids Res. 2011;39:4532-4552. PMID:21306995