Functional characterization of the gene encoding UDP-glucose: tetrahydrobiopterin alpha-glucosyltransferase in Synechococcus sp. PCC 7942.
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.
Cha
En-Young
EY
School of Biotechnology and Biomedical Science, Inje University, Kimhae 621-749, Republic of Korea.
Park
Jeong Soon
JS
Jeon
Sireong
S
Kong
Jin Seon
JS
Choi
Yong Kee
YK
Ryu
Jee-Youn
JY
Park
Youn-Il
YI
Park
Young Shik
YS
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*
D001426:Bacterial Proteins; C437230:BGluT protein, Synechococcus sp. PCC 7942; D005964:Glucosyltransferases