Title of Invention

A PROCESS FOR PRODUCING AN ALDEHYDE DEHYDROGENASE

Abstract

ABSTRACT 2699/MAS/98 The present invention relates to a process for producing an aldehyde dehydrogenase having the following physico-chemical properties: (a) Molecular weight: 150,000 ± 6,000 or 230,000 ± 9,000 (consisting of two or three homologous subunits, each having a molecular weight of about 75,000 ± 3,000), (b) Substrate specificity: active on aldehyde compounds, (c) Cofactors: pyrroloquinoline quinone and heme c, (d) Optimum pH: 7.0 to 8.5 (e) Inhibitors: Co<sup>2+<sup>, Cu<sup>2+<sup>, Fe<sup>2+<sup>, Ni<sup>2+<sup> Zn<sup>2+<sup>, monoiodoacetate and ethylenediamine tetraacetic acid, the said process comprising the steps of cultivating a microorganism belonging to the genus Gluconobacter, which is cAPable of producing the aldehyde dehydrogenase having the above properties, in an aqueous nutrient medium under aerobic conditions; disrupting the cells of the microorganism; and isolating and purifying the aldehyde dehydrogenase from the cell-free extract of the disrupted cells of the microorganism.

Full Text

The present invention concerns a process for producing aldehyde dehydrogenase (ADH). Some microorganisms are known to convert L-sorbosone to 2-KGA. For example, in U.S. Patent Specification No.3907639, the microorganisms belonging to the genera Acetobacter, Pseudomonas, Escherichia, Serratia, Bacillus, Staphylococcus, Aerobacter, Alcaligenes, Penicillium, Candida and Gluconobacter are reported to be capable of effecting the conversion. Fiirthermore, Kitamiira et al. (Eur. J. Appl. Microbiol., 2, 1, 1975 ) report that the enzyme oxidizing L-sorbosone found in Gluconobacter melanogenus IFO 3293 requires neither a coenzyme nor an electron acceptor for the development of enzyme activity. Makover et al. (Biotechnol. Bioeng. 17, 1485, 1975 ) report the presence of L-sorbosone dehydrogenase activity in the particulate fraction of Pseudomonas putida ATCC 21812 and of Gluconobacter melanogenus IFO 3293. They also indicate that neither nicotinamide adenine dinucleotide (NAD) nor nicotinamide adenine dinucleotide phosphate (NADP) acts as a coenzyme for the enzyme. T. Hoshino et al. (Agric. Biol. Chem., 55, 665, 1991) purified and characterized L-sorbosone dehydrogenase from Gluconobacter melanogenus UVIO, which requires NAD or NADP as a coenzyme. In the context of the present invention, microorganisms belonging to the genus Gluconobacter have been studied more closely and, as a result, it has been formd that the further novel ADH which catalyzes the oxidation of L-sorbosone to 2-KGA can be obtained fi-om said microorganisms. Furthermore, it has been found that the purified ADH provided by the present invention oxidizes L-sorbosone to 2-KGA in the presence of electron acceptors, such as 2,6-dichlorophenolindophenol ( DCIP ) and phenazine methosulfate ( PMS ), ferricyanide or cyrtochrome c, but that NAD, NADP and oxygen are not suitable as electron acceptors. Thus, the ADH provided by the present invention is clearly distinct fi-om the known L-sorbosone dehydrogenase. It is an object of the present invention to provide the novel ADH which acts on L-sorbosone to 2-KGA and has the following physico-chemical properties: a) Molecvdar weight: 150,000 ± 6,000 or 230,000 ± 9,000 (consisting of two or three homologous subunits, each having a molecular weight of about 75,000 ± 3,000 ) b) Substrate specificity : active on aldehyde compounds c) Cofactors : pyrroloquinoline quinone (PQQ ) and heme c d) Optimum pH : 7.0 to 8.5 e) Inhibitors : Co2+, Cu2+, Fe2+, Ni2+, Zn2+, monoiodoacetate and ethylenediamine tetraacetic acid It is another object of the present invention is to provide a process for producing the novel ADH of the invention, as defined above, by cultivating a microorganism belonging to the genus Gluconobacter, which is capable of producing the ADH having the above properties, in an aqueous nutrient medium under aerobic conditions, disrupting the cells of the microorganism and isolating and purifying the ADH from the cell-free extract of the disrupted cells of the microorganism. Yet another object of the present invention is to provide a process for producing 2-KGA from L-sorbosone utilizing the ADH of the present invention, which process comprises contacting L-sorbosone with (i) the ADH, as defined above, in the presence of an electron acceptor, or (ii) a microorganism belonging to the genus Gluconobacter which is capable of producing the ADH, as defined above, in an aqueous nutrient medium under aerobic conditions, or (iii) a cell-free extract of said microorganism, and in each of the cases (i), (ii) and (iii) isolating the resulting 2-KGA from the reaction mixture. The physico-chemical properties of the purified sample of the ADH, prepared according to the Examples presented hereinafter, are as follows: 1) Enzvme activitv The ADH of the present invention catalyzes the oxidation of L-sorbosone to 2-KGA in the presence of an electron acceptor according to the following reaction equation: L-Sorbosone + Electron acceptor - 2-KGA + Reduced electron acceptor The enzyme does not work with oxygen as an electron acceptor. This was affirmed by the failure of the enzyme to convert L-sorbosone to 2-KGA using oxygen as a possible electron acceptor. Furthermore, no oxygen consumption was detected in the reaction mixture as detected with a dissolved oxygen probe. However, any conventional compoxmd which has the ability to act as an electron acceptor can be utilized in conjunction with the enzyme of this invention. DCIP, PMS, ferricyanide and cytochrome c are preferred electron acceptors. The enzyme assay was performed as follows: The reaction mixture for assaying the ADH activity consisted of 0.1 mM DCIP, 1.0 mM PMS, 50mM potassium phosphate buffer ( pH 8.0 ), 1.0 p.M PQQ, 2.0 mM L-sorbosone and enzyme solution in a final volume of 100 |il with water, which reaction mixture was prepared just before the assay. The reaction was started at 25°C with L-sorbosone, and the enzyme activity was measured as the initial reduction rate of DCIP at 600 nm. One unit of the enzyme activity was defined as the amovmt of the enzyme catalyzing the reduction of 1 μ mole DCIP per minute. The extinction coefficience of DCIP at pH 8.0 was taken as 15 mM'-1 A reference cuvette contained all the above constituents except L-sorbosone. The protein concentration was measured with the BCA protein assay reagent ( Pierce Co., Rockford, IL 61105, U.S.A.). 2) Substrate specificitv The substrate specificity of the enzyme was determined using the same enzyme assay method as described under 1) above, except that various substrate solutions (100 mM ) were used instead of L-sorbosone. The relative activity of the ADH for D-glucosone, D-glucose, D-galactose, D-mannose, L-gulose, D-xylose, D-ribose and D-arabinose was higher than that for L-sorbosone. However, the relative activity for D,L-glyceraldehyde was lower than 1 % of that for L-sorbosone. These results are presented in Table 1: 3) Optimum pH The correlation between the reaction rate of the ADH and pH values of the reaction mixture was determined by the same assay method as described vmder 1) above, except that various pHs and buffers were used. The enzjnne showed relatively high activity at pH 7.0 to 8.5, as shown in Fig. 1. 4) Thermostabilitv The thermostability of the enzyme was tested by incubating it for 5 minutes at various temperatures in 50 mM potassium phosphate buffer ( pH 7.0 ). The residual activity was measured by the same enzyme assay method as described xinder 1) above, after which the treated enzyme was immediately cooled down in ice water. The enzyme was stable up to 45°C, but only about 30% of the activity remained after the treatment at 80 °C. The results are shown in Table 2: 5) Effects of metal ions and inhibitors The effects of metal ions and inhibitors on the activity of the enzyme were examined by measuring the activity using the same assay method as described under 1) above. Each compoimd solution was stirred into the basal reaction mixture and the reaction was started with the addition of the enzyme. The results are shown in Table 3: Each compound was added to the reaction mixture at a concentration of l.OmM, except that the concentration of EDTA was 5.0 mM. As shown in Table 3, the enzyme activity was stimulated by about 2-fold in the presence of 1.0 mM of Ca'^, whereas Co'2+ Cu2+, Fe2+ Ni'2+ and Zn2+ inhibited the enzyme activity. The addition of 5 mM ethylenediamine tetraacetic acid ( EDTA) strongly inhibited the activity. However, the enzyme activity was slightly increased to 124% and 129% by the addition of 1.0 mM quinine and 1.0 mM KCN, respectively. 6) Molecular weight The molecular weight of the enzyme was measured with a size exclusion gel column ( TSK-gel G3000 SWXL; Tosoh Co., Akasaka 1-7-7, Minato-ku, Tokyo, Japan). The enzyme showed two peaks corresponding to the apparent molecular weight of 150,000 ± 6,000 and 230,000 ± 9,000 on the chromato¬graphy. On analyzing this enzyme by SDS-polyacrylamide gel electrophoresis, it was shown that the enzyme consisted of the homologous subunit of molecular weight 75,000 ± 3,000 ( Fig. 2 ). This indicates that the enzyme consists of two or three homologous subunits. 7) Prosthetic group The purified enzyme did not show the catalyzing activity for converting L-sorbosone to 2-KGA in the basal reaction mixture without PQQ. However, the activity of the enzyme was restored by the addition of PQQ in the reaction mixture or incubating the enzyme with PQQ and Ca2+ for 5 minutes. The detection of heme c of the purified enzyme was performed by the reduced-minus-oxidized difference spectrum taken by a UV-VIS recording spectrophotometer ( Shimadzu UV-2200; Shimadzu Co., Kuwahara-cho 1, Nishinokyo, Chukyo-ku, Kyoto, Japan). The enzyme was suspended in 50 mM potassium phosphate buffer (pH 7.0 ) at a concentration of 50 |ig /ml and the enzyme of dithionite-reduced form and ammonium persulfate-oxidized form were prepared to measure the difference spectrum. The spectrum gave the difference maxima at 552 and 523 nm, as shown in Fig 3. The result strongly suggests that the enzyme has heme c as a prosthetic group. 8) Effect of substrate concentration The velocity of the oxidizing reaction with various concentrations of L-sorbosone from 1 mM to 8 mM was measured to determine the Km value for L-sorbosone. The Michaelis constant was calculated to be 17.8 mM fi-om the Lineweaver-Burk plot based on the reaction velocity when DCIP was used as the electron acceptor for the reaction. 9) Purification procedure The purification of the enzyme is effected by any combination of known purification methods, such as ion exchange chromatography, gel-electrophoresis, salting out and dialysis. The enzyme provided by the present invention can be prepared by cultivating an appropriate microorganism in an aqueous nutrient medium under aerobic conditions, disrupting the cells of the microorganism and isolating and purifying the aldehyde dehydrogenase from the cell-free extract of the disrupted cells of the microorganism. The microorganisms used for the present invention are microorganisms belonging to the genus Gluconohacter which are capable of producing aldehyde dehydrogenase as defined hereinbefore. Functional equivalents, subcultures, mutants and variants of the said microorganism can also be used in the present invention. A preferred strain is Gluconohacter oxydans. The strain most preferably used in the present invention is Gluconohacter oxydans DSM 4025, which was deposited at the Deutsche Sammlving von Mikroorganismen in Gottingen (Germany), based on the stipulations of the Budapest Treaty, under DSM No. 4025 on March 17,1987. The depositor was The Oriental Scientific Instruments Import and Export Corporation for Institute of Microbiology, Academia Sinica, 52 San-Li-He Rd., Beijing, Peoples Republic of China. The effective depositor was said Institute, of which the full address is The Institute of Microbiology, Academy of Sciences of China, Haidian, Zhongguancun, Beijing 100080, People's Republic of China. Moreover, a subculture of the strain has also been deposited at the National Institute of Bioscience and Human-Technology, Agency of Industrial Science and Technology, Japan, also based on the stipulations of the Budapest Treaty, under the deposit No. Gluconohacter oxydans DSM No. 4025 (PERM BP-3812) on March 30, 1992. The depositor was the Nippon Roche Research Center, 200 Kajiwara Aza Sotokochi, Kamakura-shi, Kanagawa-ken 247, Japan. This subculture is also most preferably used in the present invention. Furthermore, European Patent Publication No. 0 278 447 discloses the characteristics of this strain. The microorganism may be cultured in an aqueous medium supplemented with appropriate nutrients vmder aerobic conditions. The cultivation may be conducted at a pH of 4.0 to 9.0, preferably 6.0 to 8.0. The cultivation period varies depending on the pH, temperature and nutrient medixmi to be used, and is preferably about 1 to 5 days. The preferred temperature range for carrying out the cultivation is from about 13°C to about 36°C, preferably from 18°C to 33°C. It is usually required that the culture medium contains such nutrients as assimilable carbon sources, for example glycerol, D-mannitol, D-sorbitol, erythritol, ribitol, xylitol, arabitol, inositol, dulcitol, D-ribose, D-fructose, D-glucose and sucrose, preferably D-sorbitol, D-mannitol and glycerol; and digestible nitrogen sources such as organic substances, for example, peptone, yeast extract, baker's yeast, urea, amino acids and corn steep liquor. Various inorganic substances may also be used as nitrogen sources, for example nitrates and ammonium salts. Furthermore, the culture medium usually contains inorganic salts, for example magnesium sulfate, potassiimi phosphate and calcitun carbonate. An embodiment for the isolation and pvirification of the ADH from the microorganism after the cultivation is briefly described hereinafter: (1) Cells are harvested from the liquid culture broth by centrifugation or filtration. (2) The harvested cells are washed with water, physiological saline or a buffer solution having an appropriate pH. (3) The washed cells are suspended in the buffer solution and disrupted by means of a homogenizer, sonicator or French press or by treatment with lysozyme and the like to give a solution of disrupted cells. (4) The ADH is isolated and purified from the cell-free extract of disrupted cells, preferably from the cytosol fraction of the microorganism. The ADH provided by the present invention is useful as a catalyst for the production of 2-KGA from L-sorbosone. The reaction should be conducted at pH values of about 6.5 to about 9.0 in the presence of an electron acceptor, for example DCIP, PMS and the like in a solvent such as phosphate buffer, Tris-buffer and the like. When the pH and temperature are set at about 7.5 to 8.5 and about 25°C, respectively, the reaction usually produces the best results. The concentration of L-sorbosone in a solvent can vary depending upon other reaction conditions but, in general, is about 0.5 to 50 g/1, most preferably from about 1 to about 30 g/1. In the reaction, the ADH may also be used in an immobilized state with an appropriate carrier. Any means of immobilizing enzymes generally known in the art may be used. For instance, the enzyme may be bound directly to a membrane, granules or the like of a resin having one or more functional groups, or it may be bound to the resin through bridging compounds having one or more functional groups, for example glutaraldehyde. In addition to the above, the cultured cells are also useful for the production of carboxylic acids from aldehydes, especially for the production of 2-KGA from L-sorbosone. Accordingly, the present invention therefore provides a process for producing an aldehyde dehydrogenase having the following physico-chemical properties: (a) Molecular weight: 150,000 ± 6,000 or 230,000 ± 9,000 (consisting of two or three homologous subunits, each having a molecular weight of about 75,000 ± 3,000), (b) Substrate specificity: active on aldehyde compounds, (c) Cofactors: pyrroloquinoline quinone and heme c, (d) Optimum pH: 7.0 to 8.5, (e) Inhibitors: Co^ Cu^ Fe^ Ni^ Zn^ monoiodoacetate and ethylenediamine tetraacetic acid, the said process comprising the steps of cultivating a microorganism belonging to the genus Gluconobacter, which is capable of producing the aldehyde dehydrogenase having the above properties, in an aqueous nutrient medium under aerobic conditions; disrupting the cells of the microorganism; and isolating and purifying the aldehyde dehydrogenase from the cell-free extract of the disrupted cells of the microorganism. The following Example further illustrates the present invention. Example Preparation of ADH All the operations were performed at S^C, and the buffer was 0.05 M potassivmi phosphate ( pH 7.0 ) \inless otherwise stated. (1) Cultivation of Gluconobacter oxydans DSM No. 4025 (FERM BP-3812) Gluconohacter oxydans DSM 4025 (FERM BP-3812) was grown on an agar plate containing 5.0% D-mannitol, 0.25% MgS04.7H20, 1.75% corn steep liquor, 5.0% baker's yeast, 0.5% urea, 0.5% CaCOg and 2.0% agar at 27°C for 4 days. One loopful of the cells was inoculated into 50 ml of a seed culture medium containing 2% L-sorbose, 0.2% yeast extract, 0.05% glycerol, 0.25% MgS04.7H20, 1.75% corn steep liquor, 0.5% urea and 1.5% CaCO3 in a 500 ml Erlenmeyer flask, and cultivated at 30°C with 180 rpm for one day on a rotary shaker. 10 ml samples of this culture were transferred into 500 ml Erlenmeyer flasks containing 100 ml of the same seed culture medium and cultivated in the same manner as described above. The seed culture thus prepared was used for inoculating 15 liters of medium, which contained 8.0% L-sorbose, 0.05% glycerol, 0.25% MgS04.7H20, 3.0% com steep liquor, 0.4% yeast extract and 0.15% antifoam, in 30 1 jar fermentor. The fermentation parameters were 800 rpm for the agitation speed and 0.5 wm (volume of air / volume of medium / minute ) for aeration at a temperature of 30 °C. The pH was maintained at 7.0 with sodium hydroxide during the fermentation. After 48 hours of cultivation, 30 liters of the cultivated broth containing the cells of Gluconobacter oxydans DSM No. 4025 (FERM BP-3812) by using the two sets of fermentors were harvested by continuous centrifugation. The pellets containing the cells were recovered and suspende'd in an appropriate volume of saline. After the suspension had been centrifuged at 2,500 rpm ( 1,000 x g ), the supernatant containing the slightly reddish cells was recovered to remove the insoluble materials derived from corn steep liquor and yeast extract which were ingredients in the medium. The supernatant was then centrifuged at 8,000 rpm (10,000 x g) to obtain the cell pellet. As a result, 123 g of the wet weight of cells of Gluconobacter oxydans DSM No. 4025 (FERM BP-3812) were obtained from 30 liters of broth. (2) Preparation of cjrtosol fraction The cell paste ( 55 g ) was suspended with 100 ml of the buffer and passed through a French pressure cell press. After centrifugation to remove intact cells, the supernatant was designated as the cell-free extract, and the cell-free extract was centrifuged at 100,000 x g for 90 minutes. The resultant supernatant ( 165 ml) was designated as the soluble fraction of Gluconobacter oxydans DSM No. 4025 (FERM BP-3812). After this fraction had been dialyzed against the buffer, 126 ml of the dialyzed fraction having the specific activity on L-sorbosone of 2.26 imits/mg protein were used for the next purification step. (3) Diethylaminoethyl (DEAE)-cellulose column chromatography The dialysate (126 ml) was put on a column of DEAE-cellulose (Whatman DE-52, 3 X 50 cm; Whatmann BioSystems Ltd., Springfield Mill, James Whatman Way, Maidstone, Kent, U.K.) equilibrated with the buffer and washed with the buffer to elute minor proteins. Then a linear gradient elution with NaCl from 0.3 to 0.8 M in the buffer was carried out. Major enzyme activity was eluted at NaCl concentrations ranging from 0.32 to 0.36 M. The active fractions (116 ml) were collected and dialyzed against the buffer. (4) DEAE-sepharose column chromatography A 60 ml portion of the dialyzed active fraction from the previous step was introduced into a column of DEAE-sepharose CL-6B ( Pharmacia, 1.5 x 50 cm; Amersham Pharmacia Biotech AB, S-75184 Uppsala, Sweden) equilibrated with the buffer. After the column had been washed with the buffer containing 0.2 M NaCl, a linear gradient of NaCl from 0.2 to 0.6 M was added to the buffer. The active fractions were eluted at NaCl concentrations ranging from 0.44 to 0.47 M. (5) Q-sepharose column chromatography A portion ( 13.5 ml) of the pooled active fractions ( 53 ml) from the previous step was added with appropriate volume of the buffer to decrease the concentration of NaCl, and introduced into a column of Q-sepharose (Pharmacia, 1.0 by 20 cm ) equilibrated the buffer. After the column had been washed with the buffer containing 0.35 M NaCl, a linear gradient of NaCl from 0.35 to 0.5 M was added to the buffer. The activities corresponding to the ADH were eluted at NaCl concentrations ranging from 0.39 to 0.40 M. The active fractions ( 30 ml) collected were ultrafiltrated by an ultrafiltrator (Centriprep-10, Amicon; Amicon Inc. Cherry Hill Drive, Beverly, MA 01915, U.S.A.) to concentrate and desalt. As a result, 700 \i\ of the concentrated active fraction were obtained. (6) Native polyacrylamide gel electrophoresis ( Native PAGE ) A 600 III portion of the enzyme fraction from the previous step was applied on a native polyacrylamide gel ( 10%, pH 9.4,10 by 10 cm ). The electrophoresis was performed at 30 mA and 4°C for 1.5 hours. The enzyme band corresponding to the active fraction was excised from the gel, and the enzyme was electrically eluted from the gel into the Tris glycine buffer (pH 8.3) by using a MAX-YIELD Protein Concentrator (Atto Co., Hongo 1-25-23, Bunkyo-ku, Tokyo, Japan) at 10 W and 4°C for 3 hovirs. The enzyme solution was concentrated 4-fold using an ultramembrane filter (Centricon-10, Amicon), and the buffer was changed to 50 mM potassium phosphate buffer ( pH 7.0 ). Then the enzyme solution was stored at -30°C. A summary of the purification steps of the enzyme is given in Table 4 . Table 4 (7) Purity of the isolated enzyme The purified enzyme with a specific activity of 54.0 units per mg protein (0.62 mg/ml) was used for the following analysis: The molecular weight of the native enzyme was determined by high performance liquid chromatography using a size exclusion gel column (TSK gel G3000 SWXL column, 7.8 x 300 mm ) eqioilibrated with 0.1 M potassium phosphate buffer ( pH 7.0 ) containing 0.3 M NaCl at 280 nm and a flow rate of 1.5 ml per minute. Cyanocobalamin ( 1.35 K ), myoglobin ( 17 K), ovalbumin ( 44 K), T globulin ( 158 K) and thyroglobulin ( 670 K) were used as molecular weight standards. The purified enzyme showed two peaks having the molecular weights 150,000 ± 6,000 and 230,000 ± 9,000. However, in the presence of sodium dodecyl sulfate ( SDS ), the enzyme showed a single band with a molecular weight of 75,000 ± 3,000. From these results, the purified enzyme consisted of two or three homologous subunits. (8) Identification of the reaction product The reaction mixture containing the purified enzyme (1.56 mg), L-sorbosone ( 0.142 mg ), PMS ( 0.008 mg ) and PQQ ( 0.3 mg ) in 40 ml of the buffer was incubated for 1.5 hours at 30°C. The reaction product was analyzed on thin layer chromatography and HPLC. As a result, the reaction product was identified as 2-KGA in comparison with an authentic sample of 2-KGA. WE CLAIM: 1. A process for producing an aldehyde dehydrogenase having the following physico-chemical properties: (a) Molecular weight: 150,000 ± 6,000 or 230,000 ± 9,000 (consisting of two or three homologous subunits, each having a molecular weight of about 75,000 ± 3,000), (b) Substrate specificity: active on aldehyde compounds, (c) Cofactors: pyrroloquinoline quinone and heme c, (d) Optimum pH: 7.0 to 8.5 (e) Inhibitors: Co2+, Cu2+ Fe2+, Ni2+, Zn2+, monoiodo acetate and ethylenediamine tetraacetic acid, the said process comprising the steps of cultivating a microorganism belonging to the genus Gluconobacter, which is capable of producing the aldehyde dehydrogenase having the above properties, in an aqueous nutrient medium under aerobic conditions; disrupting the cells of the microorganism; and isolating and purifying the aldehyde dehydrogenase from the cell-free extract of the disrupted cells of the microorganism. 2. The process according to claun 1, wherein the microorganism is Gluconobacter oxydans having the identifying chfU'acteristics of the strain Gluconobacter oxydans DSM No. 4025 (PERM BP-3812). 3. The process according to claim 2, wherein the microorganism corresponds to Gluconobacter oxydans DSM No. 4025 (PERM BP-3812), a functional equivalent, subculture, mutant or variant thereof 4. A process for producing an aldehyde dehydrogenase substantially as herein described with reference to the accompanying drawings.

Documents:

2699-mas-1998 abstract.pdf

2699-mas-1998 claims.pdf

2699-mas-1998 correspondence-others.pdf

2699-mas-1998 correspondence-po.pdf

2699-mas-1998 description (complete).pdf

2699-mas-1998 drawings.pdf

2699-mas-1998 form-1.pdf

2699-mas-1998 form-2.pdf

2699-mas-1998 form-26.pdf

2699-mas-1998 form-4.pdf

2699-mas-1998 form-6.pdf

2699-mas-1998 petition.pdf