The synthetic peptides were purified by RPHPLC on an Aquapore RP300 column (250 x 7 mm) using a 4-72% linear gradient of solvent B (acetonitrile containing 0.1% TFA) in 130 min at a flow rate of 2 mllmin. Globin chains from respective hemoglobins were separated on a similar column of a smaller dimension (250mm x 4.6 mm) under identical conditions but at a flow rate of0.7 ml/min. Electro spray mass spectrometric analysis was carried out on a VG Platform (Fisons) mass spectrometer. The instrument was usually calibrated with standard horse heart myoglobin or gramicidin S solution. Appropriate amount of each sample was taken in 50% acetonitrile containing I% formic acid and analyzed under the positive ion mode.

normalized to the optical density at day 0 for the appropriate cell type. Growth curve was determined twice

Growth curves were prepared for various cell lines using the modified method adopted by Serrano et al, 1997. Briefly, 10, 000 cells were seeded in a 24 well plate in quadruples. At the indicated times, cells were washed once with PBS and fixed in 10% formalin for 20 minutes and rinsed with distilled water. Cells were stained with 0.05% crystal violet for 30 minutes, rinsed extensively and dried. Cell associated dye was extracted with 1.0ml acetic acid. Aliquots were diluted 1:4 with water and transferred to 96 well microtitre plates and the optical density at 590nm determined. Values were

Inverse PCR is a technique to amplify unknown regions flanking the site of transposon insertion using the primers designed from the known sequence from one end of the transposon element. Genomic DNA was digested with a 4-base recognition restriction enzyme, Sau3A1 followed by intramolecular ligation set up at high dilutions. These ligated molecules were then used as templates for the PCR performed with a pair of divergently-oriented primers designed from one end of the transposon named AH1-AH2. The PCR product thus obtained was sequenced with the same set of primers to identify the junction sequence at the site of transposon insertion and hence the identity of the gene disrupted in each case. Typical PCR conditions used were as follows:- Annealing 55°C 2 min Elongation 72°C (1 min/kb of DNA template to be amplified) Denaturation 95°C 2 min After 30 cycles of PCR, the final elongation step was carried out again for 10 min at 72°C

To 0.3 ml of infection mixture, 10 ml of Z-broth was added and incubated at 37°C with slow shaking until growth followed by the visible lysis of the culture occurred (in ~ 4-6 h). The lysate was treated with 1 ml of chloroform, centrifuged and the clear lysate was stored at 4°C with chloroform

0.3 ml of overnight culture of the donor strain in Z-broth was mixed with 107 plaque forming units (pfu) of a stock P1 lysate prepared on strain MG1655. Adsorption was allowed to occur at 37°C for 15 min and the lysate was prepared in the following ways

Polyphosphates from yeast cells were extracted with phenol-chloroform solutionas described previously(Neefand Kladde,2003). Cells grown eitherovernight or to logarithmic phase in YPDmediumwere harvested by centrifugation at 1,700 rpm for 5 min. Cells were washed with 10 ml sterile MQ water and resuspendedin ice-cold 500 μl20%trichloro acetic acid (TCA) solution to the final cell densityof 100 OD. Cell suspension was transferred toa1.5 ml microcentrifuge tube. After incubation at room temperature for 5 min, cells were harvested by centrifugation at 12,000 g for 10 minat 4 ̊C and resuspendedin 250-350 μlpolyphosphate extraction buffer.Equal volume of phenol-chloroform (25:24) was addedtothe microcentrifuge tube and aqueous phase was extracted by centrifugation at 12,000 g for 8 minat room temperature. Top aqueous layer was collected with a 200 μl tip. Aqueous layer extraction was repeated once more after removal of DNA with chloroform.After centrifugation,aqueous phasecontaining RNA and polyphosphates wascollected,RNA was quantified at A260nmandstored at -20 ̊C

hybridizations from biological replicates for each sample. Data was extracted with Feature Extraction software v 10.5 (Agilent) and normalizedwith GeneSpring GX v 11.0.1 (Agilent) software using the recommended Percentile shift Normalization to 75th percentile. Raw Data sets for this study are available at http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=

Log-phase wild-type and Cgyps1∆cells were grown in YNB and YNB-pH 2.0 medium. After 1 h incubation, yeast cells were collected, washed and were stored in RNAlater at -80°C. These frozen samples were sent to Genotypic Technology Ltd., Bangalore(http://www.genotypic.co.in) whichprovides services of global gene analysis on Agilent platform. A 8x15k GE array comprised of 60mer oligonucleotidesfor a total of C. glabrata5503 genes was used wherein average number of replicates for each probe was three. Labeling was done in single color and data is the average of two

For RNA experiments, all solutions were prepared in RNase free diethylpyrocarbonate (DEPC) water. Microcentrifuge tubes and tips used for RNAworkwere autoclaved twice and driedat 70 ̊C for overnight before use. Non-autoclavable plastic items were wiped with Ambion RNAseZap to remove RNAse contamination, if any. RNA was extracted from C.glabrata cells usingacid phenol extraction method. C. glabratacells were harvested at 2,500g for 5 minat 4 ̊C, resuspended in 1 ml ice-cold DEPC water and were transferred toa2 ml microcentrifuge tube. Cells were spun down at 6,000g for 3 minat 4 ̊C and resuspended in 350 μl AE solution. Next, 50 μl SDS and 400 μl acid phenol(pH 4.5)solutions were added to thetube and mixed well by vortexing. The tube wasincubated at 65 ̊C for 15 min with continuous mixing. After incubation, tube was kept on ice for 5 minand centrifuged at 7,500g for 5 minat 4 ̊C. Aqueous phase was transferred toa new 1.5 ml microcentrifuge tube and RNAwasextracted with an equal volume of chloroform. Total RNA was precipitated at room temperature with 1/10thvolume of 3 M sodium acetate (pH 5.2) and 2.5 volumesof chilledabsolute ethanol for 20 min. Precipitated RNA was collected by centrifugation at 7,500g for 5 minat 4 ̊C. RNA pellet was washed with chilled 70% ethanol and resuspended in 50 μl nuclease-free water. RNA concentration was determined by measuring absorbance at 260 nm. Quality of extracted RNA was examined by gel electrophoresis on 0.8% agarose gel prepared in DEPC-treated TAE buffer

Alipophilic styryl dye,FM4-64,is a vital stain which istakenupby cells viaendocytosis through plasma membrane(Vida and Emr, 1995). Therefore, it fluorescesonly in live cells. Importantly, neitherfixed cells canbe stained with FM 4-64norcells canbe fixed afterFM 4-64staining. For vacuole staining, single colony of the test strain grown onYPD plate was inoculated in 10 ml YPD medium for overnight. 100 μlovernight culture was inoculated in fresh YPD medium and incubated at 30ºC for 3 hto obtain log-phase cells. C. glabratacells from 1 ml log-phase culture were harvested at 4,000 rpm for 5 minin a table top centrifuge. Supernatant was aspirated out,cells were resuspended in 50 μl YPD medium and 1 μl FM 4-64 (16 μM final concentration) was added.C. glabratacells were incubated in a 30ºC water bath for 30 min. 1 mlYPD medium was added and cells were harvested at 4,000 rpm for 5 minin a table-top centrifuge. After discarding supernatant,C. glabratacells were washed with fresh YPD medium and resuspended in 1 ml YPD medium. C. glabratacells were incubated at 30ºC for 90 min, washed with 1 mlsterile water and were resuspended in 50 μl YNB medium. Labeled C. glabratacells were observed underfluorescence microscope in red filter(730nm)

Immunofluorescence assay was carried out as described by Bhattacharyyaet al., 2010.Adherent cells weregrown either on cover slips. After treatment, cells were fixed with 3.7% paraformaldehyde solution in PBS for 15 min and permeabilised with 0.5% Triton X-100 at room temperature for 10 min, followed by blockingin PBS containing 2% BSA for 1h. Post blocking, cells were incubated with a primary antibody in PBS (1:200 to 1:500) for 2 h. After washing, cells were incubated with fluorescent-conjugated secondary antibodyin PBS(Alexa Fluor 488 or 594 goat anti-rabbit or antii-mouse, 1:1000) for 30 min. After final wash with PBS, nuclei were counterstained with DAPI containing mounting medium (Vectashield, USA). All the steps were performed at room temperature, unless otherwise stated. Images were obtained using either the laser scanning confocal LSM510 (Carl Zeiss, Oberkochen, Germany) or fluorescence inverted (Olympus 1X51, Tokyo, Japan) microscopes

After the RNA samples were resolved, the gel was placed in a tray and incubated for 5-10 min in DEPC treated water followed by 10X SSC buffer. A nylon membrane (N+Hybond, GE Life Sciences) was cut to the size of the gel and it was rinsed in 10X SSC buffer for 5 min. In the same tray, 10X SSC buffer was filled and a gel running boat (15 cm length) was placed in an inverted position. Whatmannumber 3 filter paper (wick) was cut to an appropriate size and placed on the inverted boat in such a way that the longer edges of the paper should touch the buffer. The gel was placed upside down on the wick and care was taken not to allow any air bubbles between the gel and wick. On top of the gel, three Whatman number 3 papers that were cut to the size of gel were placed by avoiding the air bubbles. A bundle of blotting sheets was placed on top of this, on which appropriate weightwas placed and was allowed the transfer to take place for 15 –16 h

A bacterial clone expressing the recombinant protein was grown overnight in 5ml of LB medium with 50ug/ml ampicillinand the next day culture was transferred into 500ml of LB medium with 50 ug/ml ampicillin. Bacterial culture was allowed to grow at 37°C until reached an OD600 of 0.6-0.8 and then induced with IPTG (1 mM) for 4 h at 37°Cor overnight at 16°C to induce fusion protein expression. Subsequently, bacterial culture was centrifuged at 4000 RPM for 10 minutes (At this point bacterial cell pellets can be stored at -20° C for later use). The bacterial cell pellet was washed once with PBS and resuspended in 10ml of lysis buffer (1X NETN and protease inhibitors) followed by sonication (45 sec. pulse was given three times). The cell lysate was centrifuged for 10 minutes at 14000 RPM. The supernatant containing the GST fusion proteins was added to the 200μl of 50% GST/MBP beads. After 2 hours of incubation at 4°C, beads were washed three times with 1 ml lysis buffer. Purified proteins were eluted by using GST/MBP elution buffer. The recombinant proteins were analyzed by SDS-PAGE followed by either Coomassie staining orwestern blotting

Intracellular iron content in different Xanthomonas oryzaepv. oryzicolastrains was measured by using atomic absorption spectroscopy as described previously with few modifications (Velayudhan et al., 2000). For estimation of intracellular iron, different strains of Xanthomonas oryzaepv. oryzicolawere grown overnight in 3 ml PS media with appropriate antibiotics for differentially marked strains. 0.2% of the overnight grown culture was inoculated in 250 ml PS medium alone or PS plus 2, 2’-dipyridyl for iron stravation, and grown to an OD600 of 1.2. Cells were then pelleted down by centrifuging at 7000 g for 10 min, and washed twice with phosphate buffer saline (PBS). After washing, cells were lyophilized, and their dry weights were determined. Lyophilized cells were then dissolved in 30% nitric acid at 80ºC for 12 h and diluted 10-fold with miliQ water. Iron content was determined by atomicabsorption spectroscopy using ICP-OES (JY 2000 sequential Inductively Coupled Plasma Optical Emisson spectrometer,Jobin Yvon, Horiba, France). Iron level was quantified against aqueous standard of iron traceable to NIST (National institute of standards and technology, India)

confirmed through PCR (by using primers SC11 and SC10) and squencing. Double mutant was complemented for DSF production by cloning whole rpfFgene of Xoo, cloned in HindIII and EcoRI sites of pHM1 (a broad host range vector for Xanthomonas) to get pSC6 plasmid. The resultant pSC6 plasmid was introduced into double mutant by electroporation

To obtain the insertional nonpolar mutant in the motA (encodes flagellar motor stator protein)andfliC (flagellin)genes, a 321 bp internal fragment of the motAgene and a 450 bp internal fragment of fliC containing the EcoRI and XbaI site were amplified using respective primer listed in Table 2.2. These fragments were cloned in pk18mob suicide vector, in which the lacZpromoter drives the expression of downstream gene (Schäfer et al., 1994; Windgassen et al., 2000), to obtain pRR1 and pRR2,respectively (Table 2.2). The resulting plasmid (pRR1& pRR2) was introduced into XooBXO43 strain by electroporation. Single Kmrrecombinants were selected on PSA plate containing kanamycin. Insertion of the pK18mob vector in motA andfliCgene was confirmed with PCR and sequencing. To further confirm the mutation in the flagellar genes, we did swimming motility assay on 0.1% peptone-sucrose agar (PSA). Swimming plate assay indicated that both motA and fliCmutant of Xoowas deficient in motility. Further, to obtain motAand fliC insertional knock out mutants in rpfFbackground, we cloned spectinomycin cassette obtained from pUC1318Ω plasmid, into the HindIII site of pRR1 and pRR2 plasmid to obtain pRR3 and pRR4. The resulting plasmid (pRR3& pRR4) were transformed in rpfF. Single specrrecombinants were selected on PSA plate containing kanamycin and spectinomycin. Insertion of the vector was further confirmed by PCR and sequencing. T2SSrpfFdouble mutant was constructed by transforming the plasmid with rpfF::Tn7Kanamycin cassette in the T2SS (xpsF) mutant background, and Kmrrecombinants were selected on PSA plates containing kan

PCR-positive transformants were inoculated in 10 ml YPD medium, allowedto grow for 12 handgenomic DNAwas isolated.Another round of PCR was performed using genomic DNA asatemplate toconfirm the gene deletion

A homologous recombination-based strategy was used to disrupt C. glabraraORFs witha cassette containing the nat1gene, which codes for nourseothricin acetyltransferase and imparts resistance to nourseothricin. Briefly, 5’-and 3’-UTR region (nearly 500-700 bp) of the gene to be deleted were amplified by PCR using wild-type genomic DNA as template. Both 5’-and 3’-UTR amplified products were fused to one half each ofthenat1gene amplified from theplasmid(pRK625). The two nat1-amplified fragments share about 300-350 bp complimentary region. To obtain fusion products, primers were designed insucha way thatthereverse primer for 5’-UTR and the forward primer for 3’-UTRof the gene of interestshare 20 bp complimentary region with the forwardprimer for 5’nat1fragment andthereverse primer for 3’nat1fragment amplification, respectively. The fused PCR products were co-transformed in to the wild-type strain and transformants were plated on YPD-agar plates. Plates were incubated at 30°C for 16 h to allow the homologous recombination between nat1fragments,and 5’-and 3’-UTR atthegenomic loci. Post incubation,cells were replica plated ontoYPD-agar plate supplemented with 200 μg/ml nourseothricin and incubated for another 24 h. Nourseothricin-resistant colonies were purified and verified for gene disruption viahomologous recombination by PCR using appropriate set of primers

PCR-positive transformants were inoculated in 10 ml YPD medium, allowedto grow for 12 handgenomic DNAwas isolated.Another round of PCR was performed using genomic DNA asatemplate toconfirm the gene deletion

A homologous recombination-based strategy was used to disrupt C. glabraraORFs witha cassette containing the nat1gene, which codes for nourseothricin acetyltransferase and imparts resistance to nourseothricin. Briefly, 5’-and 3’-UTR region (nearly 500-700 bp) of the gene to be deleted were amplified by PCR using wild-type genomic DNA as template. Both 5’-and 3’-UTR amplified products were fused to one half each ofthenat1gene amplified from theplasmid(pRK625). The two nat1-amplified fragments share about 300-350 bp complimentary region. To obtain fusion products, primers were designed insucha way thatthereverse primer for 5’-UTR and the forward primer for 3’-UTRof the gene of interestshare 20 bp complimentary region with the forwardprimer for 5’nat1fragment andthereverse primer for 3’nat1fragment amplification, respectively. The fused PCR products were co-transformed in to the wild-type strain and transformants were plated on YPD-agar plates. Plates were incubated at 30°C for 16 h to allow the homologous recombination between nat1fragments,and 5’-and 3’-UTR atthegenomic loci. Post incubation,cells were replica plated ontoYPD-agar plate supplemented with 200 μg/ml nourseothricin and incubated for another 24 h. Nourseothricin-resistant colonies were purified and verified for gene disruption viahomologous recombination by PCR using appropriate set of primers

Dishes containing adherent cultures were placed on ice and washed once with cold PBS. Cells were scraped in 1x sample buffer on ice. Samples were sonicated in a probe sonicator (Misonix ultra sonic liquid processor, S-4000) 3 times for 15 sec each to complete cell lysis and shear DNA to reduce viscosity. Equal volumes of lysates were loaded and resolved using 12% SDS-PAGE. Samples were stored at -80ºC if necessary. Protein transfer onto PVDF membrane (GE Healthcare) was carried out at 200mA constant current for 2 h by placing the transfer tank in ice. Membranes were blocked with appropriate blocking buffer according to manufacturer’s instructions provided for each antibody. Preferentially TBST with 5% non-fat dry milk was used for blocking and for antibody dilutions. Briefly, non-specific interactions were blocked with blocking buffer (TBST+5%non-fat dry milk) for 1 h at room temperature. Membranes were probed with appropriate primary (overnight at 4ºC) and HRP-conjugated secondary antibodies (2 h at room temperature). Proteins were detected using ECL detection system. Chemiluminiscence was detected using the LAS4000 (GE Healthcare) or FlourChem E (Protein Simple) documentation system. Densitometry analysis of bands was done using ImageJ documentation software (Fiji) or the multiplex band analysis tool in AlphaView software (Protein Simple)