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In Vitro Synthesis of Glycogen: the Structure, Properties, and Physiological Function of Enzymatically-Synthesized Glycogen

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In Vitro Synthesis of Glycogen: the Structure, Properties, and Physiological Function of Enzymatically-Synthesized Glycogen Biologia 66/3: 387—394, 2011 Section Cellular and Molecular Biology DOI: 10.2478/s11756-011-0053-y Review In vitro synthesis of glycogen: the structure, properties, and physiological function of enzymatically-synthesized glycogen Hideki Kajiura1,2,HirokiTakata 2, Tsunehisa Akiyama2,RyoKakutani2, Takashi Furuyashiki2,IwaoKojima2, Toshiaki Harui1 & Takashi Kuriki2 1Development Department, Food Material Division, Glico Foods Co., Ltd., 7–16 Kasuga-cho, Takatsuki, Osaka 569-0053, Japan; e-mail: [email protected] 2Institute of Health Sciences, Ezaki Glico Co., Ltd., 4-5-6, Utajima, Nishiyodogawa-ku, Osaka 555-8502, Japan Abstract: This review describes a new enzymatic method for in vitro glycogen synthesis and its structure and properties. In this method, short-chain amylose is used as the substrate for branching enzymes (BE, EC 2.4.1.18). Although a kidney bean BE and Bacillus cereus BE could not synthesize high-molecular weight glucan, BEs from 6 other bacterial sources produced enzymatically synthesized glycogen (ESG). The BE from Aquifex aeolicus was the most suitable for the production of glycogen with a weight-average molecular weight (Mw) of 3,000–30,000 k. The molecular weight of the ESG is controllable by changing the concentration of the substrate amylose. Furthermore, the addition of amylomaltase (AM, EC 2.4.1.25) significantly enhanced the efficiency of this process, and the yield of ESG reached approximately 65%. Typical preparations of ESG obtained by this method were subjected to structural analyses. The average chain length, interior chain length, and exterior chain length of the ESGs were 8.2–11.6, 2.0–3.3, and 4.2–7.6, respectively. Transmission electron microscopy and intrinsic viscosity measurement showed that the ESG molecules formed spherical particles. Unlike starch, the ESGs were barely degraded by pullulanase. Solutions of ESG were opalescent (milky-white and slightly bluish), and gave a reddish- brown color on the addition of iodine. These analyses revealed that ESG shares similar molecular shapes and solution properties with natural-source glycogen. Moreover, ESG had macrophage-stimulating activity and its activity depends on the molecular weight of ESG. We successfully achieved large scale production of ESG. ESG could lead to new industrial applications, such as in the food, chemical, and pharmaceutical fields. Key words: glycogen; branching enzyme; enzymatic synthesis; α-glucan; polysaccharide; structure. Abbreviations: AM, amylomaltase; BE, branching enzyme; DP, degree of polymerization; ESG, enzymatically synthesized glycogen; GP, α-glucan phosphorylase; HPSEC-MALLS-RI, high-performance size-exclusion chromatography with a multi- angle laser light scattering photometer and a differential refractive index detector; IAM, isoamylase; NSG, natural-source glycogen; SP, sucrose phosphorylase; TEM, transmission electron microscopy. Glycogen has also been isolated from several higher plants. In an- imal tissues, glycogen is synthesized from UDP-glucose Glycogen is the storage form of glucose in animals, via the cooperative action of glycogenin (EC 2.4.1.186), fungi, bacteria, yeasts, and archaea. The polysaccharide glycogen synthase (EC 2.4.1.11), and branching en- is a highly branched (1→4)(1→6)-linked α-d-glucan zyme (BE, 1,4-α-d-glucan:1,4-α-d-glucan 6-α-d-(1,4-α- with a high molecular weight (106–109) (Geddes 1986). glucano)-transferase, EC 2.4.1.18). Based on the results of electron microscopy, it has been Glycogenisolatedfromanimal tissues or shellfish shown that glycogen consists of spherical particles with has been used to stimulate the exudation of phagocytic diameters of 20–40 nm (β-particles), and that the β- cells into the peritoneal cavities of experimental ani- particles often associate into much larger α-particles mals in immunological studies (Thorpe & Marcus 1967; (∼200 nm). The molecular weight of an individual Mantovani 1981). It has also been reported that glyco- β-particle has been shown to be approximately 107 gen has an antitumor effect, probably through its im- (Geddes 1986). Glycogen aqueous solution is opalescent munomodulating activity, and that this activity seems (milky-white and slightly bluish), and gives a reddish- to depend on the fine structure of glycogen (Takaya et brown color on the addition of iodine. Amylopectin, a al. 1998; Takaya 2000). Glycogen has long been consid- major component of starch, is also a highly branched ered to have health benefits as a food ingredient. As re- (1→4)(1→6)-linked α-d-glucan. However, the degree of vealed below, we demonstrated that enzymatically syn- branching, namely the number of (1→6)-α-d-glucosidic thesized glycogen (ESG) has a stimulating activity on linkages, in glycogen is about twice that in amylopectin. immunocompetent cells, such as macrophages. Glyco- A glycogen-type polymer, referred to as phytoglycogen, gen has also been used as a raw material in the cosmetic c 2011 Institute of Molecular Biology, Slovak Academy of Sciences 388 H. Kajiura et al. industry and as a carrier to enhance the yield of DNA vivo synthesis of glycogen by glycogen synthase and BE. during precipitation with organic solvent (Heath et al. Then, a question has come up. Can we synthesize glyco- 2001). gen simply using amylose as a substrate? The published results to date have all been negative: BE can synthe- In vitro synthesis of glycogen size branched glucans but their molecular weights are much lower than that of glycogen. For example, Praznik Extraction of glycogen from natural resources such as et al. (1992) reported that the action of potato BE on animal tissues or shellfishes is laborious and costly pro- amylose with a weight-average molecular weight (Mw) cess. Therefore, in vitro synthesis may be possible an- of 67.6 k resulted in a branched product with a Mw of swer to obtain glycogen in industrial scale. Actually, 33.5 k. Boyer et al. (1982) analyzed the action of maize the in vitro synthesis of glycogen has been success- BE isozyme I by gel filtration chromatography and ob- fully achieved by the combined action of α-glucan phos- served that the product was eluted more slowly than the phorylase (GP, EC 2.4.1.1) and BE using glucose-1- substrate. Kitamura (1996), using light-scattering anal- phosphate (G-1-P) as a substrate (GP-BE method) yses, also reported that potato BE brought about a de- about 70 years ago. (Cori & Cori 1943). At that time, crease in the molecular weight of the substrate amylose. enzymes were extracted from animal tissues and costly. We have reported that Bacillus cereus BE produced Additionally, GP from animal tissues is allosteric en- branched glucan with a Mw of 50 k from amylose with zyme and need to be phosphorylated or added an acti- Mw of 320 k (Takata et al. 2005). The decreases in the vator (glucose-6-phosphate) (Fukui et al. 1982). How- molecular weight of the substrate can be attributable to ever, microbial or plant enzymes have been developed a cyclization reaction by BE; it has been demonstrated andusedforthein vitro synthesis by many researchers that BE catalyzes a cyclization reaction in addition to (e.g., Tolmasky & Krisman 1987; Fujii et al. 2003; a branching reaction in vitro. As a result of cycliza- van der Vlist et al. 2008). The ESG produced by tion, the molecular weight of the substrate should be the GP-BE method has properties similar to those of decreased. By contrast, an inter-chain branching reac- the natural-source glycogen (NSG) (Kitahata & Okada tion results in both larger and smaller molecules if two 1988). UDP-glucose, a natural substrate for in vivo molecules of the same size are used as a substrate. An glycogen synthesis, was also used as substrate by us- intra-chain branching reaction should not change the ing glycogen synthase and BE as catalysts (Parodi et molecular weight. However, most studies have used BE al. 1969). Although both G-1-P and UDP-glucose are from plant sources and relatively long-chain amyloses expensive for industrial applications, the former could were used as the substrate. To evaluate the possibility be obtained from the inexpensive substrate sucrose by of glycogen synthesis from amylose, we tested the ac- using sucrose phosphorylase (SP, EC 2.4.1.7) (SP-GP- tivity of eight types of BE from various sources using BE method) (Ohdan et al. 2006). Furthermore, we have relatively short-chain amyloses as the substrates. We demonstrated that ESG produced by the SP-GP-BE found that some BEs from bacterial sources can syn- method has immunomodulating activity (Ryoyama et thesize glycogen (ESG). We then compared some of the al. 2004). However, the yield of glycogen from sucrose properties of the ESG with those of NSG. Furthermore, was less than 40%, and a more efficient method is re- we found that ESG has physiological function. quired to meet the demand for glycogen for industrial applications. Actions of BEs from several sources on amyloses In the GP-BE and SP-GP-BE methods, GP elon- gates a chain of α-(1→4)-glucan and BE introduces To evaluate the possibility of producing glycogen from branch points in the growing chains, mimicking the in amylose, we tested the actions of BEs from eight sources Table 1. Weight-average molecular weight and yield of α-glucans produced by the action of several BEs on two amyloses.a Substrate Source of BE Amylose A Amylose AS10 Mw (k) Yield (%) Mw (k) Yield (%) kidney bean N.D.b N.D. 185 16.0 Bacillus cereus N.D. N.D. 87 25.5 Escherichia coli 3600 3.9 3900 25.2 Bacillus caldovelox 5910 4.5 10200 23.7 Bacillus caldolyticus 36300 1.2 30400 5.3 Bacillus stearothermophilus 2620 6.7 5760 32.0 Aquifex aeolicus 9370 10.1 20400 59.0 Rhodothermus obamensis 10300 31.2 45300 66.7 a A reaction mixture (1 mL) containing 5 mg of Amylose A or Amylose AS-10, 50 mM buffer (optimum pH) and 200 U of various BEs was incubated at optimum temperature for each enzyme for 24 h.
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