801
|
Wang JH, Takemori AE. Studies on the transport of morphine out of the perfused cerebral ventricles of rabbits. J Pharmacol Exp Ther 1972; 181:46-52. [PMID: 4259016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
|
802
|
Wang JH, Teo TS, Wang TH. Hysteretic substrate activation of bovine heart c-AMP phosphodiestrase. Biochem Biophys Res Commun 1972; 46:1306-11. [PMID: 4334976 DOI: 10.1016/s0006-291x(72)80117-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
803
|
Wang JH, Yang CS, Tu SI. Effect of buffer concentration on the efficiency of photosynthetic energy conversion. Biochemistry 1971; 10:4922-30. [PMID: 5134537 DOI: 10.1021/bi00802a014] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
804
|
Yound JM, Wang JH. The nature of binding of competitive inhibitors to alcohol dehydrogenases. J Biol Chem 1971; 246:2815-21. [PMID: 5102926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
|
805
|
|
806
|
Dick AJ, Matheson AT, Wang JH. A ribosomal-bound aminopeptidase in Escherichia coli B: purification and properties. CANADIAN JOURNAL OF BIOCHEMISTRY 1970; 48:1181-8. [PMID: 4920230 DOI: 10.1139/o70-184] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Two procedures have been developed for the large-scale purification from Escherichia coli B of a ribosomal-bound aminopeptidase in a stable form: one involving the digestion of the ribosome with pancreatic RNase and the other the selective removal of the aminopeptidase from the ribosomal surface with NH4Cl. The enzyme, as isolated from the ribosome, is a polymeric protein composed of monomeric units with a molecular weight of approximately 60 000 Daltons. The purified enzyme is activated by β-mercaptoethanol or dithiothreitol, although at high concentrations dithiothreitol inhibits peptidase activity. Propylene glycol also inhibits the enzyme. The enzyme is stable at 70° in the presence of free SH groups.
Collapse
|
807
|
Abstract
A possible role of phospholipid in regulating the ionic permeability of excitable membranes is proposed. It is assumed that each excitable transport channel in the nerve fiber is lined with two chains of phospholipid dipoles in either parallel or antiparallel directions; a molecular mechanism of nerve excitation is developed that is qualitatively consistent with most of the relevant observations reported in the literature.
Collapse
|
808
|
Wang JH, Kwok SC, Wirch E, Suzuki I. Distinct AMP binding sites in glycogen phosphorylase b as revealed by calorimetric studies. Biochem Biophys Res Commun 1970; 40:1340-7. [PMID: 5534872 DOI: 10.1016/0006-291x(70)90013-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
809
|
Cross RL, Cross BA, Wang JH. Detection of a phosphorylated intermediate in mitochondrial oxidative phosphorylation. Biochem Biophys Res Commun 1970; 40:1155-61. [PMID: 5503790 DOI: 10.1016/0006-291x(70)90915-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
810
|
Wang JH. Possible role of pyrophosphate linkage in the active transport of sodium ions. Proc Natl Acad Sci U S A 1970; 67:59-61. [PMID: 4318789 PMCID: PMC283166 DOI: 10.1073/pnas.67.1.59] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Based upon the observation that the pyrophosphate group has a greater affinity for sodium ion than for potassium ion, and that both of these ions catalyze transphosphorylation, a simple molecular mechanism is formulated for the active transport of sodium ions across biological membranes. It is assumed that the active transport takes place along a chain of phosphomonoester groups in the membrane. Pyrophosphate linkages are synthesized at the inner boundary of the membrane by a sodium-activated kinase and hydrolyzed at the outer boundary of the membrane by a potassium-activated pyrophosphatase. It is shown that in such a model the pyrophosphate linkages can diffuse across the membrane and carry sodium ions in the direction of increasing sodium ion concentration.
Collapse
|
811
|
Abstract
Hydrogen bonding can facilitate proton transfer in certain directions and retard proton transfer in certain other directions. By assuming that directed proton transfer along strategically oriented hydrogen bonds in the enzyme-substrate complex plays an important role in determining the efficiency and specificity of the enzyme, we present a unified interpretation for the reported observations on carbonic anhydrase and alpha-chymotrypsin.
Collapse
|
812
|
Wang JH, Tu JI, Lo FM. Effect of glucose 6-phosphate on the nucleotide site of glycogen phosphorylase b. A general approach for negative heterotropic interactions. J Biol Chem 1970; 245:3115-21. [PMID: 5432802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
|
813
|
Cross RL, Wang JH. Evidence of a phosphorylated intermediate in mitochondrial oxidative phosphorylation. Biochem Biophys Res Commun 1970; 38:848-54. [PMID: 5437338 DOI: 10.1016/0006-291x(70)90797-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
814
|
Wang JH, Tu JI. Allosteric properties of glutaraldehyde-modified glycogen phosphorylase b. Selective desensitization of homotropic cooperativity. J Biol Chem 1970; 245:176-82. [PMID: 4312475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
|
815
|
|
816
|
Wang JH, Tu JI. Modification of glycogen phosphorylase b by glutaraldehyde. Preparation and isolation of enzyme derivatives with enhanced stability. Biochemistry 1969; 8:4403-10. [PMID: 5353107 DOI: 10.1021/bi00839a027] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
817
|
Tu SI, Wang JH. A flavin-chlorophyll alpha complex resembling the P700 of photosynthesis. Biochem Biophys Res Commun 1969; 36:79-83. [PMID: 4307745 DOI: 10.1016/0006-291x(69)90652-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
818
|
Tu SI, Wang JH. Conversion of light into chemical free energy through chlorophyllin-sensitized photoreduction of oxidized nicotinamide-adenine dinucleotide phosphate by cytochrome c. Biochemistry 1969; 8:2970-4. [PMID: 4390105 DOI: 10.1021/bi00835a043] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
819
|
Eisenstein KK, Wang JH. Conversion of light to chemical free energy. I. Porphyrin-sensitized photoreduction of ferredoxin by glutathione. J Biol Chem 1969; 244:1720-8. [PMID: 4305462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
|
820
|
|
821
|
Wang JH. Synthesis of amodel system for the primary energy conversion reactions in photosynthesis. Proc Natl Acad Sci U S A 1969; 62:653-60. [PMID: 4389747 PMCID: PMC223647 DOI: 10.1073/pnas.62.3.653] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
A model system is constructed which, like the photosynthetic apparatus of green plants, can convert light to chemical free energy through pigment-sensitized photooxidation of water. The system has two light-harvesting subunits connected electrically in series. Each subunit is made of a multimolecular layer of Zn(II)-tetraphenylporphyrin deposited on a clean aluminum surface and immersed in an aqueous mixture of potassium ferri- and ferrocyanide. Upon illumination by amber light, charge transfer takes place across more than 70 molecular layers of the pigment with a photoelectromotive force of 1.1 to 1.3 volts per subunit. With NADP as the electron acceptor and NADP-reductase as a mediator, the system can photooxidize water to oxygen gas. With these model experiments as a guide, a molecular mechanism for the primary energy conversion reactions in photosynthesis is formulated that offers a unified interpretation of most of the relevant observations reported in the literature.
Collapse
|
822
|
Huang K, Tu SI, Wang JH. Stabilized flavin radical in chloroplast NADP+ reductase. Biochem Biophys Res Commun 1969; 34:48-52. [PMID: 4387480 DOI: 10.1016/0006-291x(69)90526-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
823
|
Cooper TA, Brinigar WS, Wang JH. Characterization of the reaction intermediates in a model oxidative phosphorylation reaction. J Biol Chem 1968; 243:5854-8. [PMID: 5696622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
|
824
|
Black WJ, Wang JH. Studies on the allosteric activation of glycogen phosphorylase b by Nucleotides. I. Activation of phosphorylase b by inosine monophosphate. J Biol Chem 1968; 243:5892-8. [PMID: 5696623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
|
825
|
Cooper TA, Brinigar WS, Wang JH. Characterization of the Reaction Intermediates in a Model Oxidative Phosphorylation Reaction. J Biol Chem 1968. [DOI: 10.1016/s0021-9258(18)94499-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
826
|
Black WJ, Wang JH. Studies on the Allosteric Activation of Glycogen Phosphorylase b by Nucleotides. J Biol Chem 1968. [DOI: 10.1016/s0021-9258(18)94504-7] [Citation(s) in RCA: 89] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
827
|
Wang JH, Black WJ. Relationship between structural change and allosteric transitions of glycogen phosphorylase a. J Biol Chem 1968; 243:4641-9. [PMID: 5684013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
|
828
|
Wang JH, Black WJ. Relationship between Structural Change and Allosteric Transitions of Glycogen Phosphorylase a. J Biol Chem 1968. [DOI: 10.1016/s0021-9258(18)93237-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
829
|
Matheson AT, Wang JH. The influence of growth phase and ionic environment on the dissociation of Escherichia coli ribosomes by p-chloromercuribenzoate. CANADIAN JOURNAL OF BIOCHEMISTRY 1968; 46:905-10. [PMID: 4876813 DOI: 10.1139/o68-135] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The effect of p-chloromercuribenzoate (PCMB) on the structure of polysomes and ribosomes isolated from early log phase and stationary phase cells of Escherichia coli B has been studied in the presence and absence of K+. At 0° no breakdown of polysomes was observed in the presence of 0.5 mM PCMB. The 100S dimer, however, both at 0° and 25°, was readily dissociated under all conditions tested. The dissociation of 70S particles was much more sluggish and was most apparent in ribosomes isolated from early log phase cells in buffer containing K+. These results indicate that the sulfhydryl groups involved in 100S dissociation are more accessible to PCMB than those involved in the dissociation of 70S particles.
Collapse
|
830
|
Wang JH. Facilitated proton transfer in enzyme catalysis. It may have a crucial role in determining the efficiency and specificity of enzymes. Science 1968; 161:328-34. [PMID: 4298414 DOI: 10.1126/science.161.3839.328] [Citation(s) in RCA: 104] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
831
|
Parker L, Wang JH. On the mechanism of action at the acylation step of the alpha-chymotrypsin-catalyzed hydrolysis of anilides. J Biol Chem 1968; 243:3729-34. [PMID: 5658548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
|
832
|
Parker L, Wang JH. On the Mechanism of Action at the Acylation Step of the α-Chymotrypsin-catalyzed Hydrolysis of Anilides. J Biol Chem 1968. [DOI: 10.1016/s0021-9258(19)34198-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
833
|
Wang JH, Humniski PM, Black WJ. Effect of polyamines on glycogen phosphorylase. Differential electrostatic interactions and enzymic properties. Biochemistry 1968; 7:2037-44. [PMID: 5660037 DOI: 10.1021/bi00846a004] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
834
|
Riepe ME, Wang JH. Infrared studies on the mechanism of action of carbonic anhydrase. J Biol Chem 1968; 243:2779-87. [PMID: 4967960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
|
835
|
|
836
|
Wang JH, Parker L. Pretransition-state protonation and the rate of chymotrypsin catalysis. Proc Natl Acad Sci U S A 1967; 58:2451-4. [PMID: 5242218 PMCID: PMC223856 DOI: 10.1073/pnas.58.6.2451] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
|
837
|
|
838
|
Wang JH, Matheson AT. The interaction of Escherichia coli ribosomes with p-chloromercuribenzoate. BIOCHIMICA ET BIOPHYSICA ACTA 1967; 138:296-306. [PMID: 4860474 DOI: 10.1016/0005-2787(67)90490-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
839
|
Brinigar WS, Knaff DB, Wang JH. Model reactions for coupling oxidation to phosphorylation. Biochemistry 1967; 6:36-42. [PMID: 6030336 DOI: 10.1021/bi00853a008] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
840
|
Wang JH, Matheson AT. The possible role of sulfhydryl groups in the dimerization of 70S ribosomes from Escherichia coli. Biochem Biophys Res Commun 1966; 23:740-4. [PMID: 5336556 DOI: 10.1016/0006-291x(66)90463-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
841
|
|