• Journal of Microbiology and Biotechnology
• /
• 제10권6호
• /
• pp.877-880
• /
• 2000

Cycloinulooligosaccharide fructanotransferase (CFTase) converts inulin into cyclooligosaccharides consisting of six to eight molecules $\beta$-($2\rightarrow1$)-linked cyclic D-fructofuranose through intramolecular transfructosylation. We have examined the regulation of CFTase synthesis in Bacillus macerans and Bacillus subtilis. Synthesis of the CFTase was induced by inulin and it was subject to carbon catabolite repression (CCR) by glucose in both microorganisms. The DNA sequence upstream of the promoter of the CFTase gene was not involved in the inulin induction and glucose repression of the CFTase gene expression in B. subtilis. This suggests that the DNA element(s) responsible for the inuline induction and glucose repression is located downstream of the promoter region. Unexpectedly, the CCR of the expression of CFTase gene was observed not to be dependent on CcpA protein in B. subtilis.

• Journal of Microbiology and Biotechnology
• /
• 제27권3호
• /
• pp.514-523
• /
• 2017

Carbon catabolite repression is a crucial regulation mechanism in microorganisms, but its characteristic in Rhizopus is still unclear. We extracted a carbon regulation gene, cre, that encoded a carbon catabolite repressor protein (CRE) from Rhizopus stolonifer TP-02, and studied the regulation of CRE by real-time qPCR. CRE responded to glucose in a certain range, where it could significantly regulate part of the cellulase genes (eg, bg, and cbh2) without cbh1. In the comparison of the response of cre and four cellulase genes to carboxymethylcellulose sodium and a simple carbon source (lactose), the effect of CRE was only related to the concentration of reducing sugars. By regulating the reducing sugars to range from 0.4% to 0.6%, a glucose-containing medium with lactose as the inducer could effectively induce cellulases without the repression of CRE. This regulation method could potentially reduce the cost of enzymes produced in industries and provide a possible solution to achieve the largescale synthesis of cellulases.

• BMB Reports
• /
• 제28권4호
• /
• pp.342-347
• /
• 1995

The induction of glucoamylase biosynthesis from the yeast Candida tsukubaensis by different carbon sources was investigated by using either an enzyme activity assay or immunoblot analysis. The induction by C. tsukubaensis appears to be independent of the carbon sources, although the level of enzyme activity was lower in slowly utilizable carbon sources such as galactose. This glucoamylase is a constitutive enzyme and its biosynthesis is resistant to carbon catabolite repression. Glucose was more effective for the enzyme induction than starch, maltose or glycerol. In addition, this enzyme is regulated by both induction and repression.

• 한국미생물학회:학술대회논문집
• /
• 한국미생물학회 2008년도 International Meeting of the Microbiological Society of Korea
• /
• pp.164-164
• /
• 2008

• 미생물학회지
• /
• 제30권2호
• /
• pp.78-82
• /
• 1992

담자성 효모인 Trimorphomyces papilionaceous 는 생장에 thiamine 을 요구하는 최적배양온도는 25.deg.C 이며 넓은 범위의 pH (4.0-7.0) 에서 잘 자랐고 최소배지네 여러가지 탄소원을 가하고 (1%) 배양하여 균의 생장과 laccase 의 역가를 조사하였다. Glucose, frutose, mannose, sucrose 와 xylose 배지에서 OD 0.8 이상으로 자랐고 (A group), galactose 와 gluconate 의 경우 OD 0.3-0.6 (B group), 그리고 arbinose, lactose 와 pyruvate 배지에서 CD0.1-0.2 를 보였다. (C-group), Ribose, acetate, citrate, lactate 와 oxaloctate 는 이용하지 못하였다. Laccase 는 C group 배지에서 가장 높은 역가를 보였고 (8 u 이상), B group 배지에서 4-6 unit, A group 배지의 경우 가장 낮은 1.5 unit 이하를 보였다. 이균을 glucose 와 arabinose 가 혼합된 배지에 배양할 경우 laccase 는 catabolite repression 에 의하여 조절되었다.

• Journal of Microbiology and Biotechnology
• /
• 제5권2호
• /
• pp.61-67
• /
• 1995

To investigate the role of induction on CGTase production for alkalophilic Bacillus firm us var. alkalophilus H609, the constitutive mutants that form a halo around its colonies at non-inducible AG agar media containing amylose and glucose were selected. The selected constitutive mutants could produce CGTase in the range of 18.9 to 28.8 units/ml $\cdot A_{600}$ in the alkaline basal medium, and finally a constitutive mutant Bacillus firmus var. alkalophilus CM46 was selected. The constitutive nature of CM46 was also confirmed in protein level using SDS-PAGE. The effects of induction and catabolite repression for both parent strain Bacillus firmus var. alkalophilus H609 and constitutive mutant CM46 were also compared by adding soluble starch and glucose during cultivation. The selected mutant CM46 was a non-inducible but a catabolite regulated type mutant. Even though inductive regulation was released, the specific CGTase activity defined as CGTase activity per cell concentration was not increased compared with that of parent strain. The cell growth and CGTase production patterns of constitutive mutant Bacillus firmus var. alkalophilus CM46 were compared with the parent strain to identify CGTase production characteristics.

• 한국미생물·생명공학회지
• /
• 제20권2호
• /
• pp.207-212
• /
• 1992

세라티아 균주의 배양으로부터 소염제로 사용되는 세라티오펩티다아제의 생산에 관한 연구를 수행하였다. 여러가지 탄소원, 질소원 및 유도제가 효소의 생산에 미치는 영향을 조사하였는데, 탄소원은 효소의 생산이나 세포성장에 좋지 못한 기질이었으며, 특히 citrate의 경우 균체성장량은 포도당과 거의 동일하였으나, 세라오펩티다제의 생산에 저해효과가 있음이 밝혀졌다. 세라티오펩티다아제는 아미노산인 leucine을 첨가해 주었을 때 그 생산되는 양이 크게 향상되었으며 leucine의 최적 농도는 0.03였다.

• 한국식품영양학회지
• /
• 제14권1호
• /
• pp.77-81
• /
• 2001

Inulinase의 생합성 조절 기작을 규명하여 이들의 대량생산을 위한 자료로 활용하고자 Bacillus sphae-ricus 188-1이 생성하는 inulinase의 생합성 조절에 관하여 조사하였다. Inulinase의 생합성은 0.5% inulin을 함유한 생합성 조절용액에서 8시간에 효율적으로 유도되었고 0.5% fructose의 첨가는 inulin에 의한 inulinase의 생합성 유도를 억제시켰으며 fructose를 늦게 첨가할수록 inulinase 생합성 유도가 낮아졌다. CAMP의 첨가는 catabolite repression을 감소시키지 못하였다.

• 한국미생물생명공학회:학술대회논문집
• /
• 한국미생물생명공학회 2005년도 2005 Annual Meeting & International Symposium
• /
• pp.251-255
• /
• 2005

• Journal of Microbiology and Biotechnology
• /
• 제5권3호
• /
• pp.158-162
• /
• 1995

The effect of carbon and nitrogen sources on the production of novel aminopeptidase M inhibitors MR-387A and B by Streptomyces sp. SL-387 has been studied. High D-glucose and ammonia concentrations (5$\%$ and 1$\%$, respectively) exerted a negative influence on the inhibitor formation. The suppressive effect of glucose on the inhibitor formation is probably caused by an effect of medium pH rather than that of cyclic AMP. To establish the optimum conditions for inhibitor overproduction, various nitrogen sources and ammonium ion-trapping agents were examined. The use of ammonia slow-releasing nitrogen sources such as soybean meal and fish meal, or ammonium ion-trapping agents such as kaoline, celite, and natural zeolite achieved the enhancement of inhibitor production. These results also indicate that inhibitor formation is affected by ammonium ion repression.