1601
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1602
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Hsung JC, Huang L, Hoy DJ, Haug A. Lipid and temperature dependence of membrane-bound ATPase activity of Acholeplasma laidlawii. Can J Biochem 1974; 52:974-80. [PMID: 4371925 DOI: 10.1139/o74-136] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Arrhenius plots (15–45 °C) of the ATPase activity of Acholeplasma laidlawii membranes enriched with either arachidoyl or saturated short-chain groups exhibited a pronounced discontinuity in slope around 25–30 °C, absent in oleoyl-enriched membranes. The membrane lipid fluidity was measured with a stearic acid spin label. At the growth temperature (37 °C) the membrane lipid fluidity was identical for all three kinds of enriched membranes. For membranes enriched with saturated acyl chains, a plot of the electron paramagnetic resonance anisotropy parameter 2T11vs. the reciprocal of temperature showed a biphasic profile with a discontinuity in slope around 25–30 °C. For oleoyl-group enriched membranes this plot yields only a straight line between 15 and 50 °C. Thus, lipids do play a role in the functioning of the membrane-bound ATPase. This enzyme is probably localized in the more fluid regions of the membrane.
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1603
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Huang L, Montoya AL, Nester EW. Characterization of the functional activities of the subunits of 3-deoxy-D-arabinoheptulosonate 7-phosphate synthetase-chorismate mutase from Bacillus subtilis 168. J Biol Chem 1974; 249:4473-0. [PMID: 4210506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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1604
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Huang L, Nakatsukasa M, Nester E. Regulation of aromatic amino acid biosynthesis in Bacillus subtilis 168. Purification, characterization, and subunit structure of the bifunctional enzyme 3-deoxy-D-arabinoheptulosonate 7-phosphate synthetase-chorismate mutase. J Biol Chem 1974; 249:4467-72. [PMID: 4211044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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1605
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1607
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Huang L, Jaquet DD, Haug A. Effect of fatty acyl chain length on some structural and functional parameters of Acholeplasma membranes. Can J Biochem 1974; 52:483-90. [PMID: 4844283 DOI: 10.1139/o74-072] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Two membrane preparations from Acholeplasma laidlawii were obtained by supplementing the growth media with either arachidic or lauric acid. The cells grown with arachidic acid supplementation yielded membrane lipids greatly enriched with the arachidoyl group and those supplemented with lauric acid yielded membrane lipids enriched with lauroyl, myristoyl, and palmitoyl groups. The cell size (0.1–0.7 μm), the membrane thickness (70 ± 14 Å), and the cell shape (coccoid) showed no difference for these two preparations. The arachidoyl-enriched membrane had a greater buoyant density (1.195 g/ml vs. 1.189 g/ml), a smaller permeability to glycerol, and a greater sensitivity to osmotic shock compared to the membrane enriched with shorter acyl groups. The spin label 2-(10-carboxydecyl)-2-hexyl-4,4-dimethyl-3-oxazolidinyloxyl is less mobile in the arachidoyl-enriched membrane (rotational correlation time at 22 °C, τc = 10 ns) than in the shorter acyl groups enriched membrane (τc = 6 ns). This difference in apparent membrane fluidity can account for the differences observed for the membrane properties.
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1608
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Shao G, Liao D, Huang L. [Potential anticancer agents. Synthesis of derivatives of N-phthalylglutamine and related compounds]. Yao Xue Xue Bao 1966; 13:14-23. [PMID: 5952715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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1609
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Huang L, Wang L. [Studies on antiviral compounds. II. The synthesis of acetophenone derivatives]. Yao Xue Xue Bao 1965; 12:667-71. [PMID: 5899053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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1610
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Huang L. An analysis of the maze technique. J Comp Psychol 1928. [DOI: 10.1037/h0069773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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