Dna encoding a protein having d-lactate dehydrogenase activity and uses thereof

a technology of dlactate dehydrogenase and dna encoding, which is applied in the field of dlactic acid, can solve the problems that microorganisms capable of producing lactic acid have not been suitable for industrial production of lactic acid, and achieve the effect of positively affecting the production of d-lactic acid and excellent capacity for producing d-lactic acid

Inactive Publication Date: 2007-05-10
TEIJIN LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] In order to attain the above objects, the present inventors have searched for D-lactate dehydrogenase and genes that allow expression of such enzyme. As a result, they discovered a transformed line that exhibits an excellent capacity for producing D-lactic acid. More specifically, they discovered a protein that can positively affect the production of D-lactic acid and that has D-lactate dehydrogenase activity, DNA that encodes a protein having such enzyme activity, and a transformant prepared from such DNA. Further, they discovered a method for producing D-lactic acid using the same and a method for producing polylactic acid.

Problems solved by technology

Such microorganisms capable of producing lactic acid have not been suitable for industrial production of lactic acid due to the slow rates of production and the necessity for complicated medium compositions.
This technique, however, merely discloses the production of L-lactic acid.

Method used

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  • Dna encoding a protein having d-lactate dehydrogenase activity and uses thereof
  • Dna encoding a protein having d-lactate dehydrogenase activity and uses thereof
  • Dna encoding a protein having d-lactate dehydrogenase activity and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

Isolation of D-Lactate Dehydrogenase Gene

[0134] The D-lactate dehydrogenase genes derived from prokaryotic lactic acid bacteria, Leuconostoc mesenteroides (D-LDH genes, hereafter they may be simply referred to as “D-LDHME genes”), were isolated.

[0135] The genomic DNA of the strain IFO3426 (registered with the Institute for Fermentation) was used as a template to isolate the gene resource via PCR amplification. The genomic DNA of this strain was prepared using a genome DNA preparation kit (Fast DNA Kit, Bio 101) in accordance with the protocol included with the kit. The prepared genomic DNA was subjected to DNA concentration measurement using the Ultrospec 3000 spectrophotometer (Amersham Pharmacia Biotech).

[0136] The KOD Plus DNA Polymerase (Toyobo Co., Ltd.), which is perceived as having high accuracy, was used as the amplification enzyme in PCR. The reaction solution (50 μl in total) comprising 50 ng of the previously prepared genomic DNA, 50 pmol of ×2 primer DNA, 5 μl of 10× ...

example 2

Construction of Recombinant Vector

[0148] A chromosomally integrated vector capable of expressing a target gene, i.e., the D-LDHME gene obtained in Example 1, was constructed. This vector is capable of expressing the target gene under the control of the promoter sequence of the pyruvate decarboxylase 1 gene (PDCI) derived from Saccharomyces cerevisae. Such newly constructed and chromosomally integrated vector was designated as the pBTRP-PDC1-DLDHME vector. Construction of the vector was carried out in accordance with the general technique for DNA subcloning.

[0149] Hereafter, the process of vector construction in the present example is described in detail with reference to FIGS. 3 to 6.

[0150] All the enzymes used for vector construction were manufactured by Takara Shuzo Co., Ltd. It should be noted that the possible vector construction processes are not limited to this process.

1. Isolation of a Promoter Fragment of the PDC1 Gene (PDC1P) and a Downstream Fragment of the PDC1 gene ...

example 3

Transformation of Yeast

[0164] The yeast host strain IFO2260 (registered with the Institute for Fermentation) lacking the capacity for tryptophan synthesis was cultured in 10 ml of YPD medium at 30° C. until the logarithmic growth phase, and cells were collected and washed with TE buffer. Subsequently, 0.5 ml of TE buffer and 0.5 ml of 0.2 M lithium acetate were added, the resultant was subjected to shake culture at 30° C. for 1 hour, and pBTRP-PDC1-DLDHME that had been processed with the ApaI and SpeI restriction enzymes (Takara Shuzo Co., Ltd.) was then added.

[0165] The resulting suspension was subjected to shake culture at 30° C. for 30 minutes, 150 μl of 70% polyethylene glycol 4000 (Wako Pure Chemical Industries, Ltd.) was added thereto, and the mixture was thoroughly stirred. The resultant was further subjected to shake culture at 30° C. for 1 hour, the culture product was treated with a heat shock of 42° C. for 5 minutes, and the cells were then cultured in 1 ml of YPD cultu...

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Abstract

This invention provides a polynucleotide that encodes a protein having lactate dehydrogenase activity and such protein that can be used for producing D-lactic acid. This polynucleotide has the nucleotide sequence as shown in SEQ ID NO: 1 (a), and it hybridizes under stringent conditions with a probe comprising all or part of the nucleotide sequence as shown in SEQ ID NO: 1 or a complementary strand thereof and encodes a protein having D-lactate dehydrogenase activity (b).

Description

TECHNICAL FIELD [0001] The present invention relates to D-lactic acid and a technique for producing a polymer utilizing D-lactic acid. More particularly, the present invention relates to a protein having D-lactate dehydrogenase activity that is suitable for allowing yeast to produce D-lactic acid, DNA having a nucleotide sequence encoding such protein, and uses thereof. BACKGROUND ART [0002] With advances in recombinant DNA technology, a technique for obtaining gene products of interest has been developed. Such technique is realized by allowing foreign genes to be expressed in hosts such as microorganisms, molds, animals, plants, or insects and by allowing the resulting transformants to multiply. When a technique of yeast culturing is employed, for example, a large quantity of gene products of interest can be produced via fermentative production. [0003] Effective production of lactic acid, which is a starting material of plant-derived plastics, has been awaited in recent years from ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12P7/62C12P7/56C07H21/04C12N9/02C12N15/74C12N1/19C12N9/04C12N15/53
CPCC12N9/0006C12P7/56C12P7/625
Inventor ISHIDA, NOBUHIROTOKUHIRO, KENROTAKAHASHI, HARUONAGAMORI, EIJIHIRAI, MASANASAITOH, SATOSHIOHNISHI, TOHRU
Owner TEIJIN LTD
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