Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Preparing compound containing saccharide radical
Patent
1998-02-03
1999-10-05
Lilling, Herbert J.
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Preparing compound containing saccharide radical
4352521, 435823, C12N 120, C12P 1904
Patent
active
059622784
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a microorganism that is capable of producing a cellulosic product (referred to hereinafter as a "cellulose-producing bacterium") and belongs to a novel subspecies which is substantialy negative or very slightly positive in oxidation of acetates and lactates. This invention also relates to novel saccharide analog-resistant strains, amino acid analog-resistant strains and levan sucrase-defective strains.
Further, this invention relates to a method for the production of cellulosic material (bacterial cellulose: "BC"), which comprises culturing these novel bactria and to bacterial cellulose which may be thus obtained.
BACKGROUND ART
Since BC is edible as well as tasteless and odorless, it is utilized in the food industry. BC's high dispensability in water further provides it with a lot of industrial applications, such as to maintain moisture and viscosity of food, cosmetics or coating agents, to strengthen food materials, to improve stability of food, and to be used as low-calorie additives and an emulsion stabilizer.
BC is characterized by a sectional width of its fibrils which is smaller by two orders of magnitude than that of other kinds of cellulose such as those derived from wood pulp.
Owing to such structural and physical feature of microfibril, a homogenized BC has plenty of industrial applications as a strengthening agent for polymers, especially hydrophilic polymers. Products prepared by solidification of the macerated BC in the form of a lump or paper show a high elastic modulus in tension owing to the above feature, and are therefore expected to have excellent mechanical properties for use in various kinds of industrial materials.
The strains conventionally used in the production of BC include Acetobacter strains such as Acetobacter xylinum subsp. sucrofermentans such as the BPR 2001 strain, Acetobacter xylinum ATCC23768, Acetobacter xylinum ATCC23769, Acetobacter pasteurianus ATCC10245, Acetobacter xylinum ATCC14851, Acetobacter xylinum ATCC11142, Acetobacter xylinum ATCC10821; and strains derived and bred from those strains by means of various kinds of mutagenesis treatment and recombination of genes; and strains derived and generated from those strains by using known mutagens such as NTG (nitrosoguanidine).
The taxonomic characters of BPR 2001 strain are as follows:
Morphology: rod, Gram stain: negative, Spore formability: negative, Behavior toward oxygen: aerobic, Catalase: positive, Oxidase: negative, Formation of acetic acid from ethanol: positive, Oxidation of acetates: positive, Oxidation of lactates: positive.
The PQQ non-generating strain obtained from the BPR 2001 strain has been also used. One example of the above PQQ non-generating strain, designated the BPR 3001c was deposited at the National Institute of Bioscience and Human-Technology, Agency of Industrial Science and Technology (1-3, Higashi 1-chome, Tsukuba-shi, Ibaraki-ken 305 Japan) on May 2, 1994 under accession number FERM P-14297, and then transferred on May 12, 1995 to the deposit under the terms of the Budapest Treaty on the International Recognition of the Deposit of Microorganisms for the Purposes of Patent Procedure and Regulation under accession number FERM BP-5100.
Mutants include a levan sucrase-defective mutant in which the production of levan is suppressed.
Other mutants include the sulfur agent-resistant strain designated BPR 3001D, pyrimidine analogue-resistant strain designated BPR 3001I and DHO-DHase inhibitors-resistant strain designated BPR3001N, which were also deposited at the National Institute of Bioscience and Human-Technology, Agency of Industrial Science and Technology on May 25, 1994 under accession number FERM P-14330, on Jun. 10, 1994 under accession number FERM P-14362, and on Jun. 10, 1994 under accession number FERM P-14361, respectively. Further, there have been disclosed the cellulose-producing bacteria transformed with a gene for an enzyme involved in sucrose metabolism (WO95/32279) and the cellulose-producing bacteria transformed with an extracellul
REFERENCES:
patent: 5580782 (1996-12-01), Beppu et al.
ACS Computer Abstract CA112-177044(19) Brown WO8912107, Dec. 14, 1989.
ACS Computer Abstract CA124-230187(17) Naoki et al. JP0803494, Feb. 6, 1996.
ACS Computer Abstract CA123-309914(23) Krystynowicz Alina et al "Biosynthesis of bacterial cellulose and its application", 1995.
ACS Computer Abstract CA122-050889(05) Schmauder et al "Formation and application of bacterial cellulose in research, industry and medicine", 1994.
Kojima Yukiko
Matsuoka Masanobu
Seto Akira
Tonouchi Naoto
Tsuchida Takayasu
Bio-Polymer Research Co., Ltd.
Lilling Herbert J.
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