Extremolyte‐like applicability of an archaeal exopolymer, poly‐γ‐<scp>l</scp>‐glutamate

Yamasaki, Daisuke; Minouchi, Yutaka; Ashiuchi, Makoto

doi:10.1080/09593331003592279

Cited by 13 publications

(15 citation statements)

References 24 publications

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“…The cyroprotectant properties of PGA (Birrer et al ., 1994; Mitsuiki et al ., 1998; Yamasaki et al ., 2010) makes it suitable for the preservation of cryolabile nutrients.…”

Section: Potential Applicationsmentioning

confidence: 99%

Microbial production and chemical transformation of poly‐γ‐glutamate

Ashiuchi

2013

Microbial Biotechnology

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Poly-γ-glutamate (PGA), a novel polyamide material with industrial applications, possesses a nylon-like backbone, is structurally similar to polyacrylic acid, is biodegradable and is safe for human consumption. PGA is frequently found in the mucilage of natto, a Japanese traditional fermented food. To date, three different types of PGA, namely a homo polymer of d-glutamate (D-PGA), a homo polymer of l-glutamate (L-PGA), and a random copolymer consisting of d- and l-glutamate (DL-PGA), are known. This review will detail the occurrence and physiology of PGA. The proposed reaction mechanism of PGA synthesis including its localization and the structure of the involved enzyme, PGA synthetase, are described. The occurrence of multiple carboxyl residues in PGA likely plays a role in its relative unsuitability for the development of bio-nylon plastics and thus, establishment of an efficient PGA-reforming strategy is of great importance. Aside from the potential applications of PGA proposed to date, a new technique for chemical transformation of PGA is also discussed. Finally, some techniques for PGA and its derivatives in advanced material technology are presented.

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“…The cyroprotectant properties of PGA (Birrer et al ., 1994; Mitsuiki et al ., 1998; Yamasaki et al ., 2010) makes it suitable for the preservation of cryolabile nutrients.…”

Section: Potential Applicationsmentioning

confidence: 99%

Microbial production and chemical transformation of poly‐γ‐glutamate

Ashiuchi

2013

Microbial Biotechnology

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“…In fact, B. megaterium can over-produce l-rich-PGA, in which the l-isomer makes up over 90%of the polymer (Table 2), yet it is likely that eubacteria, including bacilli and staphylococci, produce polymers in which d-glutamate residues occur at a considerably high ratio (e.g., dl-co-or dhomo-PGA) [2]. Regulation of PGA stereochemistry has become an important issue in the practical application of PGA [2,23,30] as well as being of interest in fundamental research on the precise synthesis of molecularly diverse chiral biopolymers [2,31]. To date, many techniques have been developed to estimate the molecular size of biopolymers, which has been found to be critical to function.…”

Section: Resultsmentioning

confidence: 99%

“…The peculiar stereochemistry of PGA is also attractive in biochemical applications [2,23]. Here, the article introduces traditional and advanced methods for the investigation of PGA stereochemistry.…”

Section: Investigation Of Pga Stereochemistrymentioning

confidence: 99%

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Analytical approaches to poly-γ-glutamate: Quantification, molecular size determination, and stereochemistry investigation

Ashiuchi

2011

Journal of Chromatography B

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“…This mode of substrate protection is reminiscent of teichoic acids and other biopolymers that protect halophile and alkaliphile archaea and bacteria in aggressive electrolytes 61 . In the absence of the higher molecular weight fraction, monomeric bola-amphiphile fails to retard the cathodic delamination.…”

Section: Discussionmentioning

confidence: 99%

Inhibition of Steel Corrosion and Alkaline Zinc Oxide Dissolution by Dicarboxylate Bola-Amphiphiles: Self-Assembly Supersedes Host-Guest Conception

Schmelter¹,

Langry²,

Koenig³

et al. 2017

Sci Rep

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For many decorative applications like industrial and architectural paints, prevention of metal substrates from corrosion is a primary function of organic coatings. Triggered release of inhibitor species is generally accepted as a remedy for starting corrosion in case of coatings damage. A polyurethane based coating, doped with bola-amphiphiles of varying molecular weight but with a common head group motif that stems from ring-opened alkenyl succinic anhydride, enables passivation of the defect and mitigates cathodic delamination, if applied on cold rolled steel. An antagonistic effect results from the intercalation of the bola-amphiphiles into layered double hydroxide Zn2Al(OH)6 and subsequent incorporation of the hybrid phase into the organic matrix. In particular higher molecular weight bola-amphiphiles get immobilized through alkaline degradation of the layered framework in the basic milieu at the cathode. By means of sediments from colloidal states it is demonstrated that in-situ formed zinc oxide encapsulates the hybrid phase, evidenced by impeded dissolution of the ZnO based shell into caustic soda. While inhibition of steel corrosion results from a Donnan barrier layer, impeded zinc oxide dissolution is rooted in zinc catalyzed bola-amphiphile hydrolysis and layered deposition of the crystalline spacer diol hydrogenated bisphenol-A.

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Extremolyte‐like applicability of an archaeal exopolymer, poly‐γ‐l‐glutamate

Cited by 13 publications

References 24 publications

Microbial production and chemical transformation of poly‐γ‐glutamate

Microbial production and chemical transformation of poly‐γ‐glutamate

Analytical approaches to poly-γ-glutamate: Quantification, molecular size determination, and stereochemistry investigation

Inhibition of Steel Corrosion and Alkaline Zinc Oxide Dissolution by Dicarboxylate Bola-Amphiphiles: Self-Assembly Supersedes Host-Guest Conception

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