Bioscience, Biotechnology, and Biochemistry
Online ISSN : 1347-6947
Print ISSN : 0916-8451
Volume 62 , Issue 9
Showing 1-41 articles out of 41 articles from the selected issue
Analytical Chemistry Note
Organic Chemistry Regular Papers
Organic Chemistry Notes
Biochemistry & Molecular Biology Regular Papers
  • Midori ONO, Tsunetomo ASAI, Hitoshi WATANABE
    1998 Volume 62 Issue 9 Pages 1653-1659
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      A suspension culture of Calocedrus formosana Florin was studied as a material for efficient production of hinokitiol. Murashige-Skoog’s medium containing 3% sucrose and 1 mg/l 1-naphthylacetic acid was most desirable for cell growth. Cell growth, expressed as fresh cell weight, showed a 20-fold increase after 4 weeks of culture in this medium. Adding potassium acetate or chitosan to the medium increased hinokitiol production. The highest hinokitiol yield, 1700 μg/g fresh cells, was obtained when cells were cultured in the growth medium with chitosan.
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  • Yasuhiro IKENAKA, Hirokazu NANBA, Kazuyoshi YAJIMA, Yukio YAMADA, Masa ...
    1998 Volume 62 Issue 9 Pages 1672-1675
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      For the production of D-amino acids using stable N-carbamyl-D-amino acid amidohydrolase (DCase) in an immobilized form, the DCase gene of Agrobacterium sp. KNK712 was mutagenized to increase its enzymatic thermostability. In a search for thermostability-related amino acid sites besides the two known sites of DCase, i.e., the 57th and 203rd amino acids, the new mutant enzyme found, in which the 236th amino acid, valine, had been changed to alanine, showed a 10°C increase in thermostability. These known three thermostability-related amino acids were changed to other amino acids by the PCR technique, and it was proved that the thermostability of the DCase increased when the 57th amino acid of DCase, histidine, was changed to leucine, the 203rd amino acid, proline, to asparagine, glutamate, alanine, isoleucine, histidine, or threonine, and the 236th amino acid, valine, to threonine or serine, in addition to the known mutations.
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  • Kazuyoshi OHTA, Hidetoshi AKIMOTO, Shusaku MATSUDA, Daisuke TOSHIMITSU ...
    1998 Volume 62 Issue 9 Pages 1731-1738
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      Two genomic DNAs encoding endoinulinase from Aspergillus niger 12 were cloned and sequenced. Open reading frames (ORFs) of the endoinulinase genes, inuA and inuB, both consisted of 1,548 nucleotides encoding 516 amino acids. It was suggested that the coding regions were not interrupted by introns. The ORFs differed from each other by 23 nucleotide substitutions or by eight amino acid replacements, indicating that the inuA and inuB genes arose by gene duplication. Each mature enzyme of 493 amino acids was preceded by a hydrophobic signal peptide of 23 amino acids. The enzymes contained two Cys residues and five potential sites for N-linked glycosylation. Partial amino acid sequences of the secreted enzyme suggested that it originated from the inuB gene product. The deduced amino acid sequences of the mature A. niger enzymes showed 73% identity with that of the Penicillium purpurogenum endoinulinase.
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  • Kenji YOKOTA, Noriko SUGAWARA, Hirofumi NARIYA, Jun KANEKO, Toshio TOM ...
    1998 Volume 62 Issue 9 Pages 1745-1750
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      Staphylococcal γ-hemolysin consists of LukF of 34 kDa and Hlg2 (or HγII) of 32 kDa, which cooperatively lyse human and rabbit erythrocytes. Our previous data showed that the 5-residue segment K23R24L25A26I27 of Hlg2 is pivotal for the hemolytic activity [Nariya, H. and Kamio, Y., Biosci. Biotechnol. Biochem., 59, 1603-1604 (1997)]. Here, we identify an additional amino acid residue in Hlg2 necessary for the full γ-hemolysin activity by measuring the toxin activity of Hlg2 mutants in the presence of LukF. The data obtained showed that Arg217 of Hlg2 is an additional pivotal amino acid residue besides the KRLAI segment for the full Hlg2-specific function in γ-hemolysin. We also report evidence that the Hlg2 mutants showing a low or null hemolytic activity in the presence of LukF towards human erythrocytes had low or no binding activity to the cells, resulting in failure of formation of the ring-shaped pore-forming complex on the erythrocytes.
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  • Tadao OIKAWA, Yasuyuki TSUKAGAWA, Kenji SODA
    1998 Volume 62 Issue 9 Pages 1751-1756
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      A psychrotrophic yeast, Rhodotorula glutinis KUJ 2731, isolated from soil, effectively produced an extracellular endo-β-glucanase (EC 3.2.1.4). The enzyme was monomeric, and the molecular mass was about 40,000 Da. The N-terminal amino acid sequence was H-Ser-Leu-Pro-Lys-Leu-Gly-Gly-Val-Asp-Leu-Ala-Gly-Leu-Asp-Ile-Gly- Lys-Asp-Lys-Asn-. α-Helix content was calculated to be about 32.6%. The isoelectric point was 8.57. The activation energy was 20.9 kJ/mol, which was much smaller than that of mesophilic enzymes. The enzyme was active at temperatures from 0 to 70°C, with a highest initial velocity at 50°C similar to other psychrotrophic enzymes. The enzyme was inhibited by Hg2+. The enzyme catalyzed hydrolysis of carboxymethyl cellulose with an apparent Km of 1.1% and Vmax of 556 μmol/min/mg. Products from the enzymatic hydrolysis of carboxymethyl cellulose by the enzyme were glucose, cellobiose, and cellotriose. The enzyme also catalyzed the transglycosylation of p-nitrophenyl-β-cellotrioside to cellotetraose.
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  • Imre SALLAY, Tomomitsu HATAKEYAMA, Nobuyuki YAMASAKI
    1998 Volume 62 Issue 9 Pages 1757-1761
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      The binding of carbohydrates to the hemolytic lectin CEL-III isolated from the marine invertebrate Cucumaria echinata was studied. Equilibrium dialysis data suggest that CEL-III has two carbohydrate-binding sites with equal affinity. The binding of specific carbohydrates to CEL-III induces a decrease in the fluorescence intensity at 339 nm and the shift of the fluorescence emission maximum to a wavelength shorter by 3 nm, owing to the change in the environment of tryptophan. By analyzing the change in the fluorescence intensity at 339 nm as a function of the concentration of carbohydrates, the association constants for binding of individual carbohydrates to CEL-III were calculated. The results indicate that GalNAc, lactulose, and lactose are bound by CEL-III with fairly high affinity among the carbohydrates tested. The pH-dependence profile of the association constant of lactose suggests that CEL-III binds carbohydrates with highest affinity around pH 5.0. Modification of CEL-III with N-bromosuccinimide produces an oxidized derivative, in which four tryptophan residues/mol were oxidized and had no hemolytic activity. However, two out of these four tryptophans escaped from the modification in the presence of specific saccharides and the resulting derivative retained fairly high hemolytic activity.
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Biochemistry & Molecular Biology Notes
Biochemistry & Molecular Biology Preliminary Communication
  • Akihito NISHIYAMA, Hirofumi NARIYA, Yoshiyuki KAMIO
    1998 Volume 62 Issue 9 Pages 1834-1838
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      Staphylococcal leukocidin (Luk) consists of two protein components, LukF and LukS, which cooperatively lyse human and rabbit polymorphonuclear leukocytes. Here, we demonstrate that the phosphorylation of LukS by protein kinase A is crucial for the LukS-specific leukocytolytic function of Luk on HPMNLs by using N-[2(p-bromocinnamylamino)ethyl]-5-isoquinolinesulfonamide (H-89), which is a potent and selective inhibitor of protein kinase A. At 0.5 μM H-89 completely prevented the Luk-induced cell lysis accompanied by blocking of the incorporation of exogenous 32P-H3PO4 into LukS on HPMNLs. However, with LukS and LukF together, 0.5 μM H-89 did not inhibit the cell swelling which takes place before the cell lysis. HPMNLs also became swollen upon treating with both LukF and LukS mutants which could not be phosphorylated.
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Food & Nutrition Science Regular Papers
  • Katsunori KOHATA, Kouichi HANADA, Yuji YAMAUCHI, Hideki HORIE
    1998 Volume 62 Issue 9 Pages 1660-1663
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      We investigated the total content of pheophorbide a (PB a), which is sum of the contents of newly produced PB a, including PB a initially present and that converted from chlorophyllide a (Chd a) by the chlorophyllase reaction during incubation, in green tea samples, and found that the total content of PB a markedly increased in both Sencha and Matcha, compared with the initially present PB a content in each. This result demonstrates that chlorophyllase activity still remains in green tea, even after processing fresh green leaves. A comparison of the total contents of PB a produced during the incubation of chlorophyll a (Chl a) with Sencha and fresh green leaf acetone powder indicates that the ratio of chlorophyllase activity in Sencha and in fresh green leaves was about 1:20.
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  • Hiroko KIKUCHI-HAYAKAWA, Norie ONODERA, Satoshi MATSUBARA, Emi YASUDA, ...
    1998 Volume 62 Issue 9 Pages 1688-1692
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      The effects of soy milk and fermented soy milk on lipid metabolism were studied in aged ovariectomized rats. Twenty 8- mo-old Wistar rats were randomly assigned to four treatment groups: sham-operated+control diet (sham-C); ovariectomized (OVX)+control diet (OVX-C); OVX+soy milk diet (OVX-SM); and OVX+fermented soy milk diet (OVX-FSM). The rats were fed on these diets for 6 weeks. Ovariectomy induced an increase in the plasma cholesterol level by 40%. The plasma total cholesterol level of the OVX-FSM rats was decreased by 20% compared to that of the OVX-C rats. The plasma total cholesterol level of the OVX-SM group was not significantly different from that of the OVX-C and sham-C rats. The plasma triglyceride level of the OVX-FSM rats was lower than that of the sham-C rats. The liver cholesterol content in OVX-SM and OVX-FSM rats was lower than that of the OVX-C rats. The liver triglyceride contents of the sham-C, OVX-SM, and OVX-FSM groups were lower than that of the OVX-C group. Fecal steroid excretion did not differ among the groups. Ovariectomy decreased the uterus weight. The OVX-SM and OVX-FSM groups had the same uterus weights as those of the OVX-C group.
      Thus, the diet including fermented soy milk prevented the cholesterol elevation induced in rats by ovarian hormone deficiency.
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  • Kazuhiro KUBO, Morio SAITO, Tadahiro TADOKORO, Akio MAEKAWA
    1998 Volume 62 Issue 9 Pages 1698-1706
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      Docosahexaenoic acid (DHA) ingestion enhanced the susceptibility of rat liver and kidney to lipid peroxidation as a function of the dietary DHA level, but did not increase lipid peroxides as assessed by thiobarbituric acid (TBA) values to the level expected from the peroxidizability index of the tissue total lipids. This phenomenon was especially prominent in the liver. In the liver, the higher proportion of DHA in the non-phosphorus lipids might play an important role in lessening the susceptibility of the tissue to lipid peroxidation. In the brain and testis, on the other hand, lipid peroxide levels were decreased when DHA was given to the animals. In the testis, in particular, the proportion of DHA in total lipids was lowest among all tissues examined, even when a relatively high level of DHA had been ingested, and this could be related to the low lipid peroxide level. Therefore, the protection against lipid peroxidation differed from tissue to tissue, even from the viewpoint of the fatty acid composition of the tissue lipids. In addition, changes in the lipid peroxide levels of the liver, kidney, brain and testis, as assessed by TBA values, seemed to be associated with changes in the peroxidizability index of phosphatidylcholine (+ cardiolipin) in each tissue.
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  • Hiroshi OUGIYA, Kunihiko WATANABE, Takayuki MATSUMURA, Fumihiro YOSHIN ...
    1998 Volume 62 Issue 9 Pages 1714-1719
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      A new method evaluating the fibril width and length of disintegrated bacterial cellulose was developed using optical and rheological analysis.
      During the early stages of the disintegration process, the bacterial cellulose particles formed loose fibrous aggregates, followed by cutting of the disintegrated fibrils that produced short fibrils. On the other hand, the fibril width decreased steadily throughout disintegration.
      The relationships between fibril structure and suspension properties were analyzed by a multiple regression method. The thinner and longer the disintegrated bacterial cellulose fibrils were, the higher the viscosity and water-holding capacity became.
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Food & Nutrition Science Notes
  • Gow-Chin YEN, Hui-Yin CHEN
    1998 Volume 62 Issue 9 Pages 1768-1770
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      We determine the superoxide formed in the self-degradation of mutagens activated by cytochrome enzymes and evaluated the scavenging effect of various tea extracts. Benzo[a]pyrene (B[a]P) and 2-amino-6-methyldipyrido(1,2-a:3′,2′-d)imidazole (Glu-P-1) each produced a large amount of superoxide after activation by cytochrome enzymes. However, 2-amino-3-methyl-imidazo(4,5-f)quinoline (IQ), 3-amino-1,4-dimethyl-5H-pyridol(4,3-b)indole (Trp-P-1) and alfatoxin B1 (AFB1) failed to generate a significant amount of superoxide. The addition of a tea extract to the reaction system marked inhibited the derivation of superoxide from Glu-P-1. However, the tea extracts showed weaker inhibition of the B[a]P-mediated formation of superoxide. Among the four teas tested, the oolong tea extract tended to exhibit the strongest inhibitory effect. Our results suggest that the chemopreventive efficacy of a tea extract is partly associated with its antioxidative activity.
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  • Osamu KANAUCHI, Yoshitaka HITOMI, Kazue AGATA, Tomohiko NAKAMURA, Tohr ...
    1998 Volume 62 Issue 9 Pages 1788-1790
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      The effects of germinated barley foodstuff (GBF) derived from the aleurone and scutellum fractions of germinated barley low-lignified hemicellulose were examined in Sprague-Dawley rats with constipation induced by loperamide by addition to the diet (2 mg/kg body weight). Bowel movements were higher in the GBF-fed rats than in the cellulose-fed rats used as a control. Fecal water content was also higher in the GBF-fed rats. The concentration of short chain fatty acids in cecal content, especially butyrate, was significantly higher in the GBF-fed rats than in the cellulose-fed rats. These findings suggested that GBF helps normalize defecation not only in diarrhea but also constipation.
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  • Kei HASHIMOTO, Tsutomu NAKAYAMA, Makoto SHIMIZU
    1998 Volume 62 Issue 9 Pages 1819-1821
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      The mechanisms for tight-junction (TJ) stabilization by β-lactoglobulin (β-Lg) were studied. Treatment of Caco-2-SF cells with inhibitors for some enzymes in the intracellular signal transduction pathways and a cytoskeleton-disturbing agent (cytochalasin D) reduced the TJ-stabilizing activity of β-Lg. So β-Lg is suggested to modulate the cytoskeletal structure through the activation of phospholipase C and protein kinase C, resulting in the TJ stabilization.
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Microbiology & Fermentation Technology Regular Papers
  • Hideki SAKASHITA, Masayuki AZUMA, Hiroshi OOSHIMA, Jyoji KATO
    1998 Volume 62 Issue 9 Pages 1664-1667
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      The oxygen-supply capability of a spray cycle reactor was evaluated by using it for oxidative degradation of L-alanine. The volumetric oxygen transfer coefficient, kLa, was evaluated as a parameter for the oxygen supply. The liquid circulation rate in the spray cycle reactor was represented in terms of the number of circulations. The kLa increased with the number of circulations, especially by stirring in the reservoir vessel, reaching 272/h at 4.4/min of circulation numbers. This value was 1.4 times higher than that without stirring. The L-alanine degradation rate increased as the cell growth was promoted, and as the circulation numbers increased. Finally, the spray cycle reactor was evaluated by the specific degradation rate. This rate increased in proportion to the kLa, and was 8.8 times higher than that in the jar fermentor, suggesting that the spray cycle reactor is superior for oxygen-demanding fermentation.
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  • Yasuhiro IKENAKA, Hirokazu NANBA, Kazuyoshi YAJIMA, Yukio YAMADA, Masa ...
    1998 Volume 62 Issue 9 Pages 1668-1671
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      To improve the production of D-amino acids using an immobilized N-carbamyl-D-amino acid amidohydrolase, the enzyme gene of Agrobacterium sp. KNK712 was mutagenized randomly to increase its thermostability. The gene was inserted into M13mp19, mutagenized with hydroxylamine, ligated into pUC19 after restriction endonuclease digestion, and then used to transform Escherichia coli. The resultant transformants were screened by a newly developed colorimetric enzyme assay method, and the candidate colonies corresponding to red spots were separated from the master plates. Using cell-free extracts of these clones, the properties of the enzymes produced were investigated, it being proved that these enzymes had almost the same activity and improved thermostability by about 5°C compared with those of the native enzyme. As found on enzyme gene analysis of these mutants, the 57th amino acid, histidine, of the enzyme was changed to tyrosine, or the 203rd amino acid, proline, to leucine or serine.
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  • Keietsu ABE, Takeshi HIGUCHI, Ichiro YAMATO
    1998 Volume 62 Issue 9 Pages 1676-1683
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      Tetragenococcus halophila accumulates glucose and 2-deoxyglucose (dGlc) via the phosphoenolpyruvate:sugar phosphotransferase system (PTS), and pentoses, maltose, and glycerol via non-PTS carriers. Based on the discovery that xylose metabolism in T. halophila was subject to catabolite repression but not to catabolite inhibition, we designed a selection protocol for thermosensitive mutants pleiotropically unable to use sugars. One such mutant was a ptsI mutant with a thermosensitive enzyme I (EI) of the PTS (leaky at 30°C). Using this ptsI mutant, catabolite inhibition was studied. dGlc was more strongly inhibitory of glycerol uptake in the mutant than in the parent because of the leaky ptsI mutation. Thermoinactivation of EI at 42°C resulted in the total loss of uptake of PTS sugars and in the virtual abolishment of glycerol uptake. However, xylose uptake of the ptsI mutant was scarcely inhibited by dGlc even after thermoinactivation of EI. These results suggest that sensitivities of non-PTS uptakes to PTS-mediated inhibition vary among non-PTS sugars.
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  • Tsutomu HONMA, Toshiro AKINO
    1998 Volume 62 Issue 9 Pages 1684-1687
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      Five microbial strains that removed hydrogen sulfide (H2S) or methylmercaptan (CH3SH) gas were newly isolated from soil samples. Strain DO-1, one of the isolates, was identified as a member of Pseudomonas sp., and it’s immobilized cells removed 1 or 10 ppm of H2S gas within 2 hours. When strain DO-1 was cultured aerobically in a flask containing nutrient broth medium, the deodorizing activity increased, depending on the growth of the culture, and the maximum activity was obtained after 48 hours. Even though the immobilized cells were stored at 4 or 25°C in sealed bottles for 6 months, the deodorizing activity remained. Throughout this study, strain DO-1 removed H2 S gas without preliminary feeding or exposure to sulfur com-pounds as growth substrates or inducers. These characteristics are advantageous for the deodorization of the malodorous gases surrounding us in daily life.
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  • Kei ASAI, Masaya FUJITA, Fujio KAWAMURA, Hideo TAKAHASHI, Yasuo KOBAYA ...
    1998 Volume 62 Issue 9 Pages 1707-1713
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      The temperature-sensitive secA341 mutation of Bacillus subtilis affects sporulation and sporulation-associated events as well as protein secretion and cell septation. With lacZ or bgaB fusion genes, we examined the expression of the early sporulation genes in the mutant strain. Transcriptional expression of σH dependent kinA, spo0A (Ps), phrC, spoVG, and citG (p2) genes was blocked by the secA341 mutation at 37°C. On the other hand, neither repression of the abrB gene nor induction of the spo0HH) gene was affected. Active RNA polymerase containing σH was, however, found to be produced in the mutant cells. Expression of the phosphorylated Spo0A dependent spoIIG operon was also blocked. Thus the secA341 mutation blocks some step(s) or factor(s) required for σH-dependent transcription in vivo.
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  • Kaori IKAWA, Hiroyuki ARAKI, Yukiharu TSUJINO, Yasuhiro HAYASHI, Kazua ...
    1998 Volume 62 Issue 9 Pages 1720-1725
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      We have constructed a new excretion vector, pHSP64, to develop a hyperexcretion system for Bacillus subtilis [Sumitomo et al., Biosci. Biotech. Biochem., 59, 2172-2175 (1995)]. The structural gene for a novel liquefying semi-alkaline α-amylase from the alkaliphilic Bacillus sp. KSM-1378 was amplified by PCR. It was cloned into a SalI-SmaI site of pHSP64 and the recombinant plasmid obtained was introduced into B. subtilis. The transformed B. subtilis hyperproduced the α-amylase activity extracellularly, corresponding to approximately 1.0 g (5×106 units) per liter of an optimized liquid culture. The recombinant enzyme was purified to homogeneity by a simple purification procedure with very high yield. No significant differences in physicochemical and catalytic properties were observed between the recombinant enzyme and the native enzyme produced by Bacillus sp. KSM-1378. The enzymatic properties of the recombinant enzyme were further examined with respect to the responses to various metal ions. The recombinant enzyme could easily be crystallized at room temperature within one day in a buffered solution of 10% (w/v) ammonium sulfate (pH 6.5).
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  • Yasuhiko TAZUKE, Kumiko MATSUDA, Kenichi ADACHI, Yoji TSUKADA
    1998 Volume 62 Issue 9 Pages 1739-1744
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      A novel sulfatase hydrolyzing the sulfate ester bond in 3β-hydroxy-5-cholenoic acid 3-sulfate (Δ5-3β-sulfate) was purified from Pseudomonas testosteroni ATCC 11996 as the second bile acid sulfatase. The molecular weight was 95,000 and the molecule was composed of a homodimer of a subunit of which the molecular weight was 46,000. This sulfatase hydrolyzed Δ5-3β-sulfate to 3α-hydroxy-5-cholenoic acid and sulfuric acid with inversion of β- to α-configuration of the hydroxyl group at the C-3 position of the substrate. The optimum pH and the stable pH of the enzyme were 8.5 and 6.5-9.7, respectively. 3β-Sulfate ester bonds of steroids such as isolithocholic acid, pregnenolone, and epiandrosterone, in which the side chain of the steroid ring was shorter than cholesterol, were also hydrolyzed to 3α-hydroxyl compounds corresponding to each steroid compound and sulfuric acid. We tentatively named this novel enzyme bile acid 3β-sulfate sulfohydrolyase (β-BSS).
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  • Shinobu ODA, Yuichi INADA, Atsuko KOBAYASHI, Hiromichi OHTA
    1998 Volume 62 Issue 9 Pages 1762-1767
    Published: 1998
    Released: March 25, 2005
    JOURNALS FREE ACCESS
      Ethyl (R)-2-hydroxy-4-phenylbutanoate [(R)-EHPB], a useful intermediate for the synthesis of various anti-hypertension drugs, was produced via microbial reduction of ethyl 2-oxo-4-phenylbutanoate [EOPB] in an interface bioreactor. Rhodotorula minuta IFO 0920 and Candida holmii KPY 12402 were selected as the best type culture and isolated yeasts, respectively. The highest enantiomeric excess of (R)-EHPB produced by R. minuta and C. holmii were 95 and 94%, respectively. C. holmii was used for the reduction of EOPB in a pad-packed interface bioreactor (inner volume, 3 liter). After incubation for 4 days, 4.4 g of (R)-EHPB was obtained via extraction with methanol followed by column chromatography. The overall yield, chemical purity, and enantiomeric excess of (R)-EHPB were 58%, 99.1%, and 90%, respectively.
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Microbiology & Fermentation Technology Notes
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