摘要:
A novel enzyme which is useful in the optical resolution of D,L-pantolactone via D-selective asymmetric hydrolysis and a gene encoding the the same are provided. The invention discloses the gene coding for a natural D-pantolactone hydrolase (for example, one originating in Fusarium oxysporum) or proteins having an activity substantially equivalent thereto; host cells transformed with DNA containing a nucleotide sequence coding for said protein, processes for producing said protein via using said host cells and uses of said proteins and host cells.
摘要:
The invention is drawn to a new enzyme that selectively hydrolyzes D-pantolactone in D,L-pantolactone and has the following characteristics:(a) action: acts on pantolactone to produce the corresponding acid;(b) specificity for substrate: acts specifically on D-pantolactone but not on L-pantolactone;(c) pH stability: stable at pH5-9;(d) optimal pH: 7.0-7.5;(e) optimal temperature: ca. 50.degree. C.; and(f) effect of various metal ions or inhibitors: inhibited by Cd.sup.2+, Hg.sup.2+ or Cu.sup.2+ EDTA, as well as a process for the preparation thereof. The enzyme is preferably produced by cultivating the microorganisms of the genera Fusarium, Cylindrocarpon, and Gibberella, and most preferably the microorganism Fusarium oxysporum IFO 5942.
摘要:
A novel enzyme which is useful in the optical resolution of D,L-pantolactone via D-selective asymmetric hydrolysis and a gene encoding the the same are provided. The invention discloses the gene coding for a natural D-pantolactone hydrolase (for example, one originating in Fusarium oxysporum) or proteins having an activity substantially equivalent thereto; host cells transformed with DNA containing a nucleotide sequence coding for said protein, processes for producing said protein via using said host cells and uses of said proteins and host cells.
摘要:
A process for the preparation of D-pantolactone, comprising employing specific microorganisms to convert D,L-pantolactone as the starting material into D-pantoic acid by selective asymmetric hydrolysis of the D-form only in the D,L-pantolactone, and then separating D-pantoic acid and converting it into D-pantolactone.
摘要:
A liver function improver, food, or drink comprising, as an effective ingredient, a dioxabicyclo[3.3.0]octane derivative, such as sesamin, sesaminol espisesamin, episesaminol, sesamolin, 2-(3,4-methylenedioxyphenyl)-6-(3-methoxy-4-hydroxyphenyl)-3,7-dioxabicyclo[3.3.0]octane, 2,6-bis-(3-methoxy-4-hydroxyphenyl)-3,7-dioxabicyclo[3.3.0]octane or 2-(3,4-methylenedioxyphenyl)-6-(3-methoxy-4-hydroxyphenoxy)-3,7-dioxabicyclo[3.3.0]octane.
摘要:
Acyl-CoA synthetase, having a high activity to C.sub.16 -C.sub.18 long chain fatty acids, is obtained by culturing strains belonging to various genera. As is known, acyl-CoA synthetase, having a strong activity to C.sub.16 -C.sub.18 long chain fatty acids, is generally obtained from liver of rat; however, it has now been discovered that acyl-CoA synthetase can be obtained from microorganisms and this enzyme is called acyl-CoA synthetase LCF-18. By use of acyl-CoA synthetase LCF-18 of the present invention which has a high activity to C.sub.16 -C.sub.18 long chain fatty acids, serum non-esterified fatty acid of human beings can be accurately determined, and it is very useful for diagnosis of diabetes and so forth.
摘要:
A process for the production of dihomo-&ggr;-linolenic acid comprising the steps of culturing a microorganism having an ability to produce araquidonic acid and having a reduced or lost &Dgr;5 desaturase activity to produce dihomo-&ggr;-linolenic acid or a lipid containing dihomo-&ggr;-linolenic acid, and recovering the dihomo-&ggr;-linolenic acid.
摘要:
A process for the production of a highly unsaturated fatty acid having an odd number of carbon atoms by culturing a microorganism belong to the genus Mortierella and capable of producing the fatty acid; and a process for the production a highly unsaturated fatty acid having an odd number of carbon atoms, typically represented by 8,11,14-nonadecatrienoic acid, by culturing a microorganism capable of producing arachidonic acid.
摘要:
A method for producing S-adenosyl-L-homocysteine hydrolase, which comprises cultivating a microorganism having the ability to produce S-adenosyl-L-homocysteine hydrolase within its cells in a nutrient medium to accumulate said hydrolase in the cells, said microorganism being a bacterium belonging to the genera Alcaligenes, Pseudomonas, Acinetobacter, Arthrobacter, Enterobacter, Rhodopseudomonas, Agrobacterium, Micrococcus, Corynebacterium, Brevibacterium, Chromobacterium, Xanthomonas, Flavobacterium, Cellulomonas, Azotobacter and Protaminobacter, or an actinomycete belonging to the genera Streptomyces, Mycobacterium, Nocardia, Streptoverticillium, Micromonospora, Micropolyspora, Streptosporangium and Microellobosporia; and then recovering S-adenosyl-L-homocysteine hydrolase from the cells.
摘要:
In a process for the production of a D-.alpha.-amino acid, in which an N-carbamyl-D-.alpha.-amino acid corresponding to the general formula: ##STR1## wherein R represents phenyl, hydroxy-substituted phenyl, substituted or unsubstituted alkyl, or thienyl, is converted by a microbial enzyme in an aqueous medium to a D-.alpha.-amino acid corresponding to the general formula: ##STR2## wherein R is the same as defined above, decarbamylase produced by a microorganism of the genus Comamonas, Blastobacter, Alcaligenes, Sporosarcina, Rhizobium, Bradyrhizobium or Arthrobacter is used as the enzyme converting the N-carbamyl-D-.alpha.-amino acid to the D-.alpha.-amino acid.The conversion of the N-carbamyl-D-.alpha.-amino acids to the D-.alpha.-amino acids is carried out in a neutral to alkaline pH range.