title: Functional characterization of the gene encoding UDP-glucose: tetrahydrobiopterin alpha-glucosyltransferase in Synechococcus sp. PCC 7942.
abstract: In this study, we attempted to characterize the Synechococcus sp. PCC 7942 mutant resultant from a disruption in the gene encoding UDP-glucose: tetrahydrobiopterin alpha-glucosyltransferase (BGluT). 2D-PAGE followed by MALDI-TOF mass spectrometry revealed that phycocyanin rod linker protein 33K was one of the proteins expressed at lower level in the BGluT mutant. BGluT mutant cells were also determined to be more sensitive to high light stress. This is because photosynthetic O2 exchange rates were significantly decreased, due to the reduced number of functional PSIs relative to the wild type cells. These results suggested that, in Synechococcus sp. PCC 7942, BH4-glucoside might be involved in photosynthetic photoprotection.
authors.affiliation: School of Biotechnology and Biomedical Science, Inje University, Kimhae 621-749, Republic of Korea.
authors.forename: En-Young
authors.initials: EY
authors.lastname: Cha
authors.forename: Jeong Soon
authors.initials: JS
authors.lastname: Park
authors.forename: Sireong
authors.initials: S
authors.lastname: Jeon
authors.forename: Jin Seon
authors.initials: JS
authors.lastname: Kong
authors.forename: Yong Kee
authors.initials: YK
authors.lastname: Choi
authors.forename: Jee-Youn
authors.initials: JY
authors.lastname: Ryu
authors.forename: Youn-Il
authors.initials: YI
authors.lastname: Park
authors.forename: Young Shik
authors.initials: YS
authors.lastname: Park
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics*; D005798:Genes, Bacterial / Q000502:physiology; D005964:Glucosyltransferases / Q000235:genetics*; D010788:Photosynthesis; D040901:Proteomics; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D046940:Synechococcus / Q000201:enzymology*
chemical_list: D001426:Bacterial Proteins; C437230:BGluT protein, Synechococcus sp. PCC 7942; D005964:Glucosyltransferases