Sequences were examined by similarity search using BLASTP against the non-redundant (NR) database from the National Center for Biotechnology Information (NCBI: http://blast.ncbi.nlm.nih.gov/). These extra sequences were found to be similar to mevalonate kinase (e.g., NP_013935 in S. cerevisiae, NP_000422.1 in human, and NP_198097.1 in Arabidopsis thaliana). Mevalonate kinase is found in both eukaryotes and prokaryotes, and the basidiomycete sequences are equally distant (30?0 identity) 
from mevalonate kinase proteins found in ascomycetes, metazoans, and plants. In basidiomycetes, the sequences similar to mevalonate kinase exist only as part of the cystathionine beta-lyase orthologues. We found no other mevalonate kinase homologues as stand-alone proteins. On the contrary, in ascomycetes, we found mevalonate kinases only as stand-alone (single-domain) proteins (e.g., NP_013935 in S. cerevisiae). On each ascomycete genome, the genes encoding cystathionine 22948146 beta-lyase and mevalonate kinase do not appear to be clustered together.10 mM NH4+ as sole nitrogen. 10 to 15 transformants, restored for methionine prototrophy, were obtained per selection plate when Dstr3 strains were transformed with the full length MoSTR3 coding sequence, but no methionine prototrophs were obtained on the same media when Dstr3 strains were transformed with an empty pGEM-T vector. Dstr3 MoSTR3 complementation strains remained hygromycin JI-101 site resistant, indicating random insertion of the full-length STR3 coding 117793 sequence had occurred in the Dstr3 genome, and were confirmed by PCR. All Dstr3 MoSTR3 complementation strains were re-screened for methionine prototrophy, and two complementation strains resulting from transformation of Dstr3 with the MoSTR3 PCR product were applied to plants to show they were restored for pathogenicity (one of which is shown in Figure S1).Rice plant infections and live-cell-imagingRice plant infections were made using a susceptible dwarf Indica rice (Oryza sativa) cultivar, CO-39, as described previously [9]. Fungal spores were isolated from 12?4 day-old plate cultures and spray-inoculated onto rice plants of cultivar CO-39 in 0.2 gelatin at a concentration of 56104 spores ml21, and disease symptoms were allowed to develop under conditions of high relative humidity for 96?44 hrs. Live-cell-imaging was performed as described in [6] also using the susceptible rice cultivar CO-39. Briefly, 3 cm-long sheath segments from 3? week-old rice plants were placed in a glass container with a wet paper towel for high humidity conditions. Sheaths were kept horizontal and flat in a stable support to avoid contact with the wet paper. By using a pipette, a spore suspension of 56104 spores ml21 in 0.2 gelatin was injected in one end of the sheath. The suspension was uniformly distributed inside the sheaths. After 36 and 48 hpi, the sheath ends were removed and the segments were trimmed and immediately observed under the microscope. Images 12926553 were taken using a Nikon Eclipse 50i microscope and a Nikon D100 digital net camera.Targeted gene replacementProtoplast generation and transformation were performed as described previously [31]. DNA for PCR was extracted from Guy11 strains as described previously [8]. Gene replacement of STR3 by the hygromycin phosphotransferase-encoding gene hph employed the PCR-based split marker method described in [9]. The STR3-specific primers used were as follows: Str3NesF: CATCGCTATTGCAAAAATAACCTGG and Str3-2: GTCGTGACTGGGAAAACCCTGGCGGCC.Sequences were examined by similarity search using BLASTP against the non-redundant (NR) database from the National Center for Biotechnology Information (NCBI: http://blast.ncbi.nlm.nih.gov/). These extra sequences were found to be similar to mevalonate kinase (e.g., NP_013935 in S. cerevisiae, NP_000422.1 in human, and NP_198097.1 in Arabidopsis thaliana). Mevalonate kinase is found in both eukaryotes and prokaryotes, and the basidiomycete sequences are equally distant (30?0 identity) from mevalonate kinase proteins found in ascomycetes, metazoans, and plants. In basidiomycetes, the sequences similar to mevalonate kinase exist only as part of the cystathionine beta-lyase orthologues. We found no other mevalonate kinase homologues as stand-alone proteins. On the contrary, in ascomycetes, we found mevalonate kinases only as stand-alone (single-domain) proteins (e.g., NP_013935 in S. cerevisiae). On each ascomycete genome, the genes encoding cystathionine 22948146 beta-lyase and mevalonate kinase do not appear to be clustered together.10 mM NH4+ as sole nitrogen. 10 to 15 transformants, restored for methionine prototrophy, were obtained per selection plate when Dstr3 strains were transformed with the full length MoSTR3 coding sequence, but no methionine prototrophs were obtained on the same media when Dstr3 strains were transformed with an empty pGEM-T vector. Dstr3 MoSTR3 complementation strains remained hygromycin resistant, indicating random insertion of the full-length STR3 coding sequence had occurred in the Dstr3 genome, and were confirmed by PCR. All Dstr3 MoSTR3 complementation strains were re-screened for methionine prototrophy, and two complementation strains resulting from transformation of Dstr3 with the MoSTR3 PCR product were applied to plants to show they were restored for pathogenicity (one of which is shown in Figure S1).Rice plant infections and live-cell-imagingRice plant infections were made using a susceptible dwarf Indica rice (Oryza sativa) cultivar, CO-39, as described previously [9]. Fungal spores were isolated from 12?4 day-old plate cultures and spray-inoculated onto rice plants of cultivar CO-39 in 0.2 gelatin at a concentration of 56104 spores ml21, and disease symptoms were allowed to develop under conditions of high relative humidity for 96?44 hrs. Live-cell-imaging was performed as described in [6] also using the susceptible rice cultivar CO-39. Briefly, 3 cm-long sheath segments from 3? week-old rice plants were placed in a glass container with a wet paper towel for high humidity conditions. Sheaths were kept horizontal and flat in a stable support to avoid contact with the wet paper. By using a pipette, a spore suspension of 56104 spores ml21 in 0.2 
gelatin was injected in one end of the sheath. The suspension was uniformly distributed inside the sheaths. After 36 and 48 hpi, the sheath ends were removed and the segments were trimmed and immediately observed under the microscope. Images 12926553 were taken using a Nikon Eclipse 50i microscope and a Nikon D100 digital net camera.Targeted gene replacementProtoplast generation and transformation were performed as described previously [31]. DNA for PCR was extracted from Guy11 strains as described previously [8]. Gene replacement of STR3 by the hygromycin phosphotransferase-encoding gene hph employed the PCR-based split marker method described in [9]. The STR3-specific primers used were as follows: Str3NesF: CATCGCTATTGCAAAAATAACCTGG and Str3-2: GTCGTGACTGGGAAAACCCTGGCGGCC.