title: Characterization of short-chain poly3-hydroxybutyrate in baker's yeast.
abstract: A short-chain poly3-hydroxybutyrate including four comonomers, originating from a complex with calcium polyphosphate, was isolated from commercial baker's yeast cells (Saccharomyces cerevisiae) and characterized as the second complexed poly(3-hydroxyalkanoate) (cPHA) in eukaryotes. The number-average molecular weight of 4982.5 Da with a polydispersity index of 1.11 was much lower than that of beet cPHA previously isolated. End-group analysis suggested that at least 60% of the molecules form the cyclic structures. Here, the organism-dependent structural diversity of cPHAs was completely established. It was also found that a change of culture medium influences the molecular weight but not the polydispersity of baker's yeast cPHA.
authors.affiliation: Polymer Chemistry Laboratory, RIKEN Institute, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan. yoshi@riken.jp
authors.forename: Yoshikatsu
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Esumi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Koshino
authors.forename: Masashi
authors.initials: M
authors.lastname: Ueki
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Doi
mesh_terms: D006885:Hydroxybutyrates / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D008970:Molecular Weight; D011091:Polyesters / Q000737:chemistry* / Q000302:isolation & purification; D012441:Saccharomyces cerevisiae / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D000094122:Polyhydroxybutyrates
chemical_list: D006885:Hydroxybutyrates; D011091:Polyesters; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates