HIGH CO2 CONCENTRATION ALLEVIATES THE BLOCK IN PHOTOSYNTHETIC ELECTRON-TRANSPORT IN AN NDHB-INACTIVATED MUTANT OF SYNECHOCOCCUS SP PCC-7942

被引:40
作者
MARCO, E [1 ]
OHAD, N [1 ]
SCHWARZ, R [1 ]
LIEMANHURWITZ, J [1 ]
GABAY, C [1 ]
KAPLAN, A [1 ]
机构
[1] HEBREW UNIV JERUSALEM, DEPT BOT, IL-91904 JERUSALEM, ISRAEL
关键词
D O I
10.1104/pp.101.3.1047
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The high-concentration CO2-requiring mutant N5 of Synechococcus sp. PCC 7942 was obtained by the insertion of a kanamycin-resistant gene at the EcoRI site, 12.4 kb upstream of rbc. The mutant is unable to accumulate inorganic carbon internally and exhibits very low apparent photosynthetic affinity for inorganic carbon but a photosynthetic V(max), similar to that of the wild type. Sequence and northern analyses showed that the insertion inactivated a gene highly homologous to ndhB, encoding subunit II of NADH dehydrogenase in Synechocystis sp. PCC 6803 (T. Ogawa [1991] Proc Natl Acad Sci USA 88: 4275-4279). When the mutant and the wild-type cells were exposed to 5% CO2 in air, their photosynthetic electron transfer capabilities, as revealed by fluorescence and thermoluminescence measurements, were similar. On the other hand, a significant decrease in variable fluorescence was observed when the mutant (but not the wild-type) cells were exposed to low CO2 under continuous light. The same treatment also resulted in a shift (from 38-27-degrees-C) in the temperature at which the maximal thermoluminescence emission signal was obtained in the mutant but not in the wild type. These results may indicate that subunit II of NADH dehydrogenase is essential for the functional operation of the photosynthetic electron transport in Synechococcus under low but not high levels of CO2. We suggest that the inability to accumulate inorganic carbon under air conditions stems from disrupture of electron transport in this mutant.
引用
收藏
页码:1047 / 1053
页数:7
相关论文
共 41 条
[1]   CARBONIC-ANHYDRASE AND CO2 CONCENTRATING MECHANISMS IN MICROALGAE AND CYANOBACTERIA [J].
AIZAWA, K ;
MIYACHI, S .
FEMS MICROBIOLOGY LETTERS, 1986, 39 (03) :215-233
[2]   THE CO2 CONCENTRATING MECHANISM IN CYANOBACTERIA AND MICROALGAE [J].
BADGER, MR ;
PRICE, GD .
PHYSIOLOGIA PLANTARUM, 1992, 84 (04) :606-615
[3]   PROPERTIES OF A MUTANT FROM SYNECHOCYSTIS PCC6803 RESISTANT TO ACETAZOLAMIDE, AN INHIBITOR OF CARBONIC-ANHYDRASE [J].
BEDU, S ;
PELTIER, G ;
SARREY, F ;
JOSET, F .
PLANT PHYSIOLOGY, 1990, 93 (04) :1312-1315
[4]   CYANOBACTERIA CONTAIN A MITOCHRONDRIAL COMPLEX-I-HOMOLOGOUS NADH-DEHYDROGENASE [J].
BERGER, S ;
ELLERSIEK, U ;
STEINMULLER, K .
FEBS LETTERS, 1991, 286 (1-2) :129-132
[6]  
Eaton-Rye J. J., 1986, ION INTERACTIONS ENE, P263
[7]   THE 5'-FLANKING REGION OF THE GENE ENCODING THE LARGE SUBUNIT OF RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE OXYGENASE IS CRUCIAL FOR GROWTH OF THE CYANOBACTERIUM SYNECHOCOCCUS SP STRAIN PCC-7942 AT THE LEVEL OF CO2 IN AIR [J].
FRIEDBERG, D ;
KAPLAN, A ;
ARIEL, R ;
KESSEL, M ;
SEIJFFERS, J .
JOURNAL OF BACTERIOLOGY, 1989, 171 (11) :6069-6076
[8]   A REGION OF A CYANOBACTERIAL GENOME REQUIRED FOR SULFATE TRANSPORT [J].
GREEN, LS ;
LAUDENBACH, DE ;
GROSSMAN, AR .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1989, 86 (06) :1949-1953
[9]  
INOUE Y, 1987, PROGR PHOTOSYNTHESIS, V1, P637
[10]   PHYSIOLOGICAL AND MOLECULAR ASPECTS OF THE INORGANIC CARBON-CONCENTRATING MECHANISM IN CYANOBACTERIA [J].
KAPLAN, A ;
SCHWARZ, R ;
LIEMANHURWITZ, J ;
REINHOLD, L .
PLANT PHYSIOLOGY, 1991, 97 (03) :851-855