The use of 1-anilino-8-naphthalene sulfonate as fluorescent probe for conformational studies on ribulose-1,5-bisphosphate carboxylase.
نویسنده
چکیده
The influence of Mg2+ ions and temperature on the structure of the enzyme ribulose-1,5-bisphosphate carboxylase was investigated using the fluorescent probe 1-anilino-8-naphthalene sulfonate (ANS). The binding of ANS to the enzyme molecule caused a significant increase of fluorescence emission which was further enhanced by the addition of Mg2+. The temperature dependence of the fluorescence emission indicated a conformational change of the enzyme between 12 and 24 degrees C. The Mg2+ and the temperature effects were additive. ANS itself did not change the conformation of the enzyme. The influence of the substrates carbon dioxide and ribulose-1,5-bisphosphate, and the effect of the pH of the medium and of a sulfhydryl reducing reagent on fluorescence emission were analysed.
منابع مشابه
Interaction of the fluorescent probe RH421 with ribulose-1,5-bisphosphate carboxylase/oxygenase and with Na+,K(+)-ATPase membrane fragments.
Fluorescence titrations have shown that the voltage-sensitive probe RH421 interacts with the water-soluble protein ribulose-1,5-bisphosphate carboxylase/oxygenase and with Na+,K(+)-ATPase membrane fragments. The probe exhibits significantly different fluorescence excitation spectra in pure lipid and pure protein environments. Experiments with a range of polyamino acids showed interactions of th...
متن کاملInvestigations on the Structure and Conformational Dynamics in Ribulose-1,5- Bisphosphate Carboxylase/oxygenase (rubisco) Molecule
A review is made of the published investigations concerning the structure and conformational dynamic changes in the key photosynthetic and photorespiratory enzyme – Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) of higher plants. Recent data on the basis of X-ray crystalography, NMR-spectroscopy, site-directed mutagenesis and other techniques are analysed. Despite some differences in...
متن کاملThe orientation of substrate and reaction intermediates in the active site of ribulose-1,5-bisphosphate carboxylase.
There are four possible orientations of the substrate ribulose 1,5-bisphosphate in the active site of ribulose-1,5-bisphosphate carboxylase. Distinction between these four possible orientations has been made on the basis of 31P NMR and borohydride-trapping experiments. The orientation of the reaction-intermediate analog, 2'-carboxy-D-arabinitol 1,5-bisphosphate with respect to the divalent meta...
متن کاملExchange Properties of the Activator CO(2) of Spinach Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase.
The exchange properties of the activator CO(2) of spinach ribulose-1,5-bisphosphate carboxylase/oxygenase were characterized both in vitro with the purified enzyme, and in situ within isolated chloroplasts. Carboxyarabinitol-1,5-bisphosphate, a proposed reaction intermediate analog for the carboxylase activity of the enzyme, was used to trap the activator CO(2) on the enzyme both in vitro and i...
متن کاملRibulose 1,5-bisphosphate and activation of the carboxylase in the chloroplast.
Ribulose 1,5-bisphosphate in the chloroplast has been suggested to regulate the activity of the ribulose bisphosphate carboxylase/oxygenase. To generate high levels of ribulose bisphosphate, isolated and intact spinach chloroplasts were illuminated in the absence of CO(2). Under these conditions, chloroplasts generate internally up to 300 nanomoles ribulose 1,5-bisphosphate per milligram chloro...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Zeitschrift fur Naturforschung. Section C, Biosciences
دوره 31 5-6 شماره
صفحات -
تاریخ انتشار 1976