Energy-induced modulation of the kinetics of oxidative phosphorylation and reverse electron transfer

The kinetics of ATP synthesis by bovine heart submitochondrial particles (SMP) are modulated by the rate of energy production by the respiratory chain between two fixed limits characterized by apparent KmADP = 2-4 microM and Vmax approximately 200 nmol of ATP min-1 (mg of SMP protein)-1 at low energy levels and apparent KmADP = 120-160 microM and Vmax = 11,000 nmol of ATP min-1 (mg of SMP protein)-1 at high energy levels. These data indicate that KmADP and Vmax increase approximately 50-fold each; therefore, there is essentially no change in the catalytic efficiency of the ATP synthase complex in going from one extreme to the other. At intermediate rates of energy production, the kinetic data required introduction of a third, intermediate KmADP. A KmADP of 10-15 microM fitted all the data reported here and previously [Matsuno-Yagi, A., & Hatefi, Y. (1986) J. Biol. Chem. 261, 14031-14038]. However, this is not meant to suggest that there is a fixed intermediate KmADP, as the transition from one fixed limit to the other may be fluid or involve more than one intermediate state. In addition, it has been shown that kinetic plots of SMP-catalyzed and ATP-driven reverse electron transfer from succinate to NAD are curvilinear and resolvable into a minimum of two apparent KmNAD values of about 20-30 and 200-300 microM. These results have been discussed in relation to the three potentially active catalytic sites of F1-ATPase and the structure of the NADH:ubiquinone oxidoreductase complex, the curvilinear kinetics of ATP hydrolysis, and changes in KmADP and KmPi in photophosphorylation as affected by the duration and intensity of light.     

Fine structure of the intersegmental membrane glands of the sixth abdominal sternum of female Nomia melanderi (Hymenoptera,Apoidea)

The fine structure of the intersegmental glands of the sixth abdominal sternum in 1-week old females of Nomia melanderi is presented. The plasma membrane of the secretory cell is unfolded in many places and is covered by a basement membrane. The microvillous surface is invaginated to form a rather long sinuous cavity. The endoplasm is almost entirely filled by secretory granules. Many secretory granules are located close to the inner surface of the invaginated plasma membrane. The invagination contains a porous ductule, apparently of cuticulin origin, that is connected directly with the inner layer of the transport duct of the duct-forming cell. This type of arrangement allows the direct flow of the secretory substance to the outside in a continuous way. The cylindrical duct-forming cell, besides having typical cell organelles, contains a cuticular transport duct. This duct is composed of a thin cuticulin layer surrounded by a rather thick epicuticular one. The results suggest that the secretory cell has two secretory cycles. The first occurs while the gland is differentiating (at the pupal stage) and is involved in secretion of the cuticulin that forms the porous ductule. The second cycle, which starts by the beginning of nesting, is involved in the secretion of a substance that is carried to the outside via the transport duct of the duct-forming cell.     

Studies on the structure of NADH: ubiquinone oxidoreductase complex: topography of the subunits of the iron-sulfur protein component

Resolution of the mitochondrial NADH:ubiquinone oxidoreductase complex (Complex I) by chaotropic agents result in the separation of three building blocks of the enzyme, designated FP (flavoprotein), IP (iron-sulfur protein), and HP (hydrophobic protein). FP contains three subunits of Mr 51, 24, and 9 kDa; one FMN; and two iron-sulfur clusters. Immunochemical studies with monospecific antibodies to the FP subunits have indicated that all three subunits of FP protrude from the inner mitochondrial membrane on the matrix side, whereas no reactive epitopes from these subunits were found exposed on the cytosolic side [A.-L. Han, T. Yagi, and Y. Hatefi (1988) Arch. Biochem. Biophys. 267, 490-496]. IP contains six subunits of Mr 75, 49, 30, 18, 15, and 13 kDa and four iron-sulfur clusters. In the present study, immunochemical experiments (enzyme-linked immunosorbent assays and 125I-protein A labeling) were carried out with monospecific antibodies to the above IP subunits and with bovine Complex I, submitochondrial particles, mitoplasts, and intact mitochondria as sources of antigens. Results have indicated that all six IP subunits protrude from the inner mitochondrial membrane into the matrix, and that the 75-kDa subunit, and possibly the 15-kDa subunit, protrude in mitoplasts from the cytosolic side as well. No epitopes reactive toward the monospecific antibodies to the 49-, 30-, 18-, and 13-kDa subunits were detected in mitoplasts.     

Production of ethanol by alginate-entrapped Saccharomyces cerevisiae strain "14-12"

Cells of S. cerevisiae strain "14-12" of different ages were immobilized in sodium alginate and used for conversion of glucose to ethanol. Immobilized cells of 48 hr old were the most potential. Employment of high counts of alginate-entrapped cells shortened the period required for production of the maximal alcohol yield. However, the percentage surviving cells decreased with increasing initial cell counts. Maximal accumulation of ethanol (4.18 g/100 ml) was obtained after 4 days of static fermentation with 1.8 X 10(8) immobilized yeast cells. The residual viable cell count was found to represent 3-fold the surviving percentage in a control experiment using an inoculum of the free yeast cells. Immobilized yeast cells could convert about 85% of the available sugars to ethanol over 28 days of the repeated-batch fermentation. The immobilized cells retained 50% of their viability for 16 days. After 48 days of repeated fermentation only 6% of the yeast cells were viable, and on the 52nd day no viable cells could be detected.     

The primary structure of the mitochondrial energy-linked nicotinamide nucleotide transhydrogenase deduced from the sequence of cDNA clones

The amino acid sequence of the bovine mitochondrial nicotinamide nucleotide transhydrogenase, which catalyzes hydride ion transfer between NAD(H) and NADP(H) coupled to proton translocation across the mitochondrial inner membrane, has been deduced from the corresponding cDNA. Two clones were isolated by screening a bovine lambda gt10 cDNA library, using two synthetic oligonucleotides and a cDNA restriction fragment as probes. The inserts together covered 3,105 base pairs of coding sequence, corresponding to 1.035 amino acid residues. However, the reading frame at the 5' end was still open. N-terminal sequence analysis of the isolated enzyme indicated the presence of 8 additional residues. Thus, the mature transhydrogenase appeared to have 1,043 amino acid residues and a calculated molecular weight of 109,212. The deduced amino acid sequence of the transhydrogenase contained the sequences of four tryptic peptides that had been isolated from the enzyme. Two of these were the peptides that had been used for construction of the oligonucleotide probes. The other two were tryptic peptides isolated after labeling the NAD-binding site of the transhydrogenase once with [3H]p-fluorosulfonylbenzoyl-5'-adenosine (FSBA), and another time with [14C]N,N'-dicyclohexylcarbodiimide. The FSBA-labeled peptide was found to be located immediately upstream of the [14C]N,N'-dicyclohexylcarbodiimide-labeled peptide, about 230 residues from the N terminus. One of the tryptic peptides used for oligonucleotide probe construction was the same as that labeled with [3H]FSBA when the NAD-binding site was protected from FSBA attack. This peptide, which might be at the NADP-binding site of the transhydrogenase, was located very near the C terminus of the enzyme. The central region of the transhydrogenase (residues 420-850) is highly hydrophobic and appears to comprise about 14 membrane-spanning segments. By comparison, the N- and the C-terminal regions of the enzyme, which contain the NAD- and the putative NADP-binding sites, respectively, are relatively hydrophilic and are probably located outside the mitochondrial inner membrane on the matrix side. There is considerable homology between the bovine enzyme and the Escherichia coli transhydrogenase (two subunits, alpha with Mr = 54,000 and beta with Mr = 48,700), whose amino acid sequence has been determined from the genes (Clarke, D.M., Loo, T.W., Gillam, S., and Bragg, P.D. (1986) Eur. J. Biochem. 158, 647-653).     

Ethanol tolerance ofSaccharomyces cerevisiae and its relationship to lipid content and composition

Saccharomyces cerevisiae strain 14-12 is a highly ethanol-tolerant organism. It can grow in the presence of 13% ethanol but growth is completely prevented at 14% ethanol. A relationship was detected between yeast lipids and ethanol tolerance. A gradual decrease of lipid content was recorded as the concentration of supplemented ethanol increased. Moreover, free fatty acids were comparatively decreased in these lipid extracts. When separately added to media with 14% ethanol different lipids produced varied stimulatory effects on yeast growth. Maximum yield of yeast growth was obtained at 14% ethanol in the presence of lecithin, palmitic acid and cholesterol. Yeast lipids produced in the presence of these fractions are characterized by a relatively high percentage of free fatty acids. The change in the percentage of free fatty acids was shown to be the controlling factor in ethanol tolerance.     

Inactivation of D-(-)-beta-hydroxybutyrate dehydrogenase by modifiers of carboxyl and histidyl groups

Data presented in this paper suggest that D-(-)-beta-hydroxybutyrate dehydrogenase (BDH) purified from bovine heart mitochondria contains an essential carboxyl group and an essential histidyl residue at or near the active site. Lactate and malate dehydrogenases, which catalyze reactions analogous to that catalyzed by BDH, also contain an aspartyl and a histidyl residue at the active site [Birktoft, J.J., & Banaszak, L.J. (1983) J. Biol. Chem. 258, 472-482]. In addition, all three enzymes contain an essential arginyl residue, apparently concerned with electrostatic interaction with their respective carboxylic acid substrates, and promote ternary adduct formation involving the enzyme, NAD, and sulfite.     

Kinetics of ATP hydrolysis by F1-ATPase and the effects of anion activation, removal of tightly bound nucleotides, and partial inhibition of the ATPase by covalent modification

Eadie-Hofstee plots (v/[S] vs. v) of the kinetics of ATP hydrolysis by purified bovine heart mitochondrial F1-ATPase (MF1) over a substrate (MgATP) concentration range of 1-5000 microM were curvilinear, indicating negative cooperativity with respect to [MgATP] as originally shown by Ebel & Lardy (1975) [Ebel, R. E., & Lardy, H. A. (1975) J. Biol. Chem. 250, 191-196]. The data were computer analyzed for the best fit of the least number of straight lines, each representing a different apparent Km and Vmax. The best fits for MF1 and TF1 from the thermophilic bacterium PS3 were three lines in each case. The upper limits of the apparent Km values for MF1 were of the order of 10(-6), 10(-4), and 10(-3) M, and the corresponding apparent Vmax values (per minute per milligram of protein) were in the range of micromoles or less for the lowest Km line and decamicromoles for the other two. The results for TF1 were very similar. The presence of an activating anion (10 mM KHCO3) in the MF1 assay medium increased the overall Vmax by about 50% and eliminated the high Km but had essentially no effect on the intermediate and low Km's, indicating retention of negative cooperativity in the corresponding substrate concentration range. Kinetic data for MgITP as substrate also yielded two Km values (in the absence of KHCO3) differing by about 10(4)-fold. The relationship between [14C]dicyclohexylcarbodiimide [( 14C]-DCCD) binding to MF1 and activity inhibition was linear up to approximately 1 mol of DCCD bound/mol of MF1. At this point, the degree of inhibition was about 95%.(ABSTRACT TRUNCATED AT 250 WORDS)