CO2 acquisition in Chlamydomonas acidophila is influenced mainly by CO2, not phosphorus, availability
CO2 acquisition in Chlamydomonas acidophila is influenced mainly by CO2, not phosphorus, availability
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嗜酸衣藻中 CO2 的获取主要受 CO2 而非磷可用性的影响
DOI:
10.1007/s11120-014-0016-6
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发表时间:
2014
影响因子:
3.7
通讯作者:
J. Beardall
中科院分区:
文献类型:
--
作者:
Spijkerman;S. Stojkovic;J. Beardall
The extremophilic green microalgaChlamydomonas acidophilagrows in very acidic waters (pH 2.3–3.4), where CO2is the sole inorganic carbon source. Previous work has revealed that the species can accumulate inorganic carbon (Ci) and exhibits high affinity CO2utilization under low-CO2(air-equilibrium) conditions, similar to organisms with an active CO2concentrating mechanism (CCM), whereas both processes are down-regulated under high CO2(4.5 % CO2) conditions. Responses of this species to phosphorus (Pi)-limited conditions suggested a contrasting regulation of the CCM characteristics. Therefore, we measured external carbonic anhydrase (CAext) activities and protein expression (CAH1), the internal pH, Ci accumulation, and CO2-utilization in cells adapted to high or low CO2under Pi-replete and Pi-limited conditions. Results reveal thatC. acidophilaexpressed CAextactivity and expressed a protein cross-reacting with CAH1 (the CAextfromChlamydomonas reinhardtii). Although the function of this CA remains unclear, CAextactivity and high affinity CO2utilization were the highest under low CO2conditions.C. acidophilaaccumulated Ci and expressed the CAH1 protein under all conditions tested, andC. reinhardtiialso contained substantial amounts of CAH1 protein under Pi-limitation. In conclusion, Ci utilization is optimized inC. acidophilaunder ecologically relevant conditions, which may enable optimal survival in its extreme Ci- and Pi-limited habitat. The exact physiological and biochemical acclimation remains to be further studied.
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影响因子:
3.7
作者:
Spijkerman E;de Castro F;Gaedke U
通讯作者:
Gaedke U
DOI:
--
发表时间:
1981
期刊:
影响因子:
--
作者:
J. Beardall
通讯作者:
J. Beardall
影响因子:
2.4
作者:
E. Young;J. Beardall;M. Giordano
通讯作者:
E. Young;J. Beardall;M. Giordano
DOI:
--
发表时间:
1985
期刊:
影响因子:
--
作者:
G. Findenegg
通讯作者:
G. Findenegg
影响因子:
7.4
作者:
T. Williams;B. Colman
通讯作者:
B. Colman