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Shi YQ, Li SC, Guo KJ. Long-term results of cerebral hemispherectomy: follow up study of 4 cases with observation of a 22 year survivor. Chin Med J (Engl) 1981; 94:679-84. [PMID: 6797803] [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: 01/21/2023] Open
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305
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Matsumoto M, Taki T, Samuelsson B, Pascher I, Hirabayashi Y, Li SC, Li YT. Further characterization of the structure of GM1b ganglioside from rat ascites hepatoma. J Biol Chem 1981; 256:9737-41. [PMID: 7287705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
A ganglioside named GM1b (Hirabayashi, Y., Taki, T., and Matsumoto, M. (1979) FEBS Let. 100, 253-257) with a sugar composition identical with that of GM1, II3 alpha NeuAc-GgOse4Cer (Gal beta 1 leads to 3GalNAc beta 1 leads to 4Gal(3 leads from 2 alpha NeuAc) beta 1 leads to 4G1c beta 1 leads to 1'ceramide), isolated from rat ascites hepatoma was further characterized. In contrast to GM1, the sialic acid in this ganglioside was susceptible to clostridial sialidase in the absence of bile salts. Based on the sequential enzymic hydrolysis, permethylation analysis and direct probe mass spectrometric analysis, the structure of this ganglioside is determined to be: NeuAc alpha 2 leads to 3Gal beta 1 leads to 3GalNAc beta 1 leads to 4Gal beta 1 leads to 4Glc leads to ceramide. The structure of this ganglioside is identical with that biosynthesized in vitro (Stoffyn, A., Stoffyn, P., and Yip, M. C. M. (1975) Biochim. Biophys. Acta 409, 97-103).
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Abstract
Two endo-beta-N-acetylglucosaminidases (mannosyl-glycoprotein 1,4-N-acetamidodeoxy-beta-D-glycohydrolase, EC 3.2.1.96) (type F-I and type F-II) have been isolated from fig latex. At pH 7.0, type F-1 was retained by the DEAE-Sephadex A-50 column, whereas type F-II was not adsorbed by the column. The optimum pH of type F-I was found to be pH 5.9 and type F-II, pH 5.4. Type F-I enzyme hydrolyzes the tri-mannosyl derivatives di-N-acetylglucosaminylasparagine faster than the penta- or hexa-mannosyl compounds. Type F-II hydrolyzes the penta- and hexa-mannosyl derivatives, but not the tri-mannosyl compound.
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Li SC, Hirabayashi Y, Li YT. A protein activator for the enzymic hydrolysis of GM2 ganglioside. J Biol Chem 1981; 256:6234-40. [PMID: 7240201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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309
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Abstract
The 13C n.m.r. spectrum of Forssman hapten was obtained at 25.16 MHz in [3H] chloroform/[2H] methanol (1:1, v/v), using purified glycosphinogolipid from canine intestinal mucosa (glycolipid I). All amide, olefin, anomeric, intersaccharide glycosidic ether, amide linkage, methyl and many methylene resonances were resolved and assigned. Analysis of the anomeric region reveals the following pentaglycosylceramide structure as originally proposed [Siddiqui & Hakomori (1971) J. Biol. Chem. 246, 5766-5769]: GalNAc (alpha 1 leads to 3) GalNAc (beta 1 leads to 3) Gal (alpha 1 leads to 4) Gal (beta 1 leads to 1) ceramide. Analysis of the amide, olefin and methylene regions reveals no alpha-hydroxy fatty acyl group and less than or equal to 6 mol% unsaturated fatty acyl groups are present. Chemical-shift assignments are reported for the anomeric and glycosidic ether carbon atoms of intersaccharide-linked alpha-galactose and N-acetyl-alpha-galactosamine residues. Two rules are proposed for the assignment of the anomeric form of 1 leads to 3 and 1 leads to 4 linkages of galactose and N-acetylgalactosamine residues present in the glycone of glyco-conjugates. The present study emphasizes the importance of the anomeric "window" (80-120 p.p.m.) in studies of glycone structure.
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310
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Iwase H, Morinaga T, Li YT, Li SC. Analysis of endo-beta-N-acetylglucosaminidase activity by high-pressure liquid chromatography on a silica-based chemically bonded octadecyl column. Anal Biochem 1981; 113:93-5. [PMID: 6267954 DOI: 10.1016/0003-2697(81)90048-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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311
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Itoh T, Li YT, Li SC, Yu RK. Isolation and characterization of a novel monosialosylpentahexosyl ceramide from Tay-Sachs brain. J Biol Chem 1981; 256:165-9. [PMID: 7451432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A novel monosialoganglioside was isolated from Tay-Sachs brains. It represented about 0.1% of the total ganglioside mixture. Compositional analysis by gas-liquid chromatography indicated that it contained glucose, galactose, N-acetylgalactosamine, N-acetylneuraminic acid, and long chain base in the molar ratio of 1:2:2:1:1. The ganglioside was found to be resistant to neuraminidase (Clostridium perfringens), beta-hexosaminidase (jack bean), and beta-galactosidase. However, it could be degraded by a human liver beta-hexosaminidase preparation in the presence of an activator to produce a glycolipid chromatographically identical with authentic IV3NeuAc-GgOse4-ceramide. This glycolipid product was resistant to beta-galactosidase (jack bean), but could be readily degraded to GgOse4-ceramide by neuraminidase. Mild formic acid hydrolysis degraded the intact ganglioside to an asialo derivative chromatographically identical with the pentahexosyl ceramide (GalNAc-Gal-GalNAc-Gal-Glc-ceramide) derived from GD1a-GalNAc. The asialo derivative could then be degraded to GgOse4-ceramide and GgOse3-ceramide by sequential treatment with jack bean beta-hexosaminidase and beta-galactosidase. These data suggest that the novel ganglioside is a monosialosylpentahexosyl ceramide with the sialosyl group attached to the penultimate galactose moiety of the pentahexosyl ceramide backbone, and it has the following structure: GalNAc(beta 1-4)Gal(beta 1-3)GalNAc(beta 1-4)Gal(beta 1-4)Glc-ceramide (formula see text).
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312
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Nakagawa H, Yamada T, Chien JL, Gardas A, Kitamikado M, Li SC, Li YT. Isolation and characterization of an endo-beta-galactosidase from a new strain of Escherichia freundii. J Biol Chem 1980; 255:5955-9. [PMID: 6769923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
A new strain of Escherichia freundii was isolated from human feces. Compared with the previous strain (Kitamikado, M., and Ueno, R. (1970) Bull. Jpn. Soc. Sci. Fish. 36, 1175-1180), this strain releases comparable levels of endo-beta-galactosidase with lower levels of exoglycosidases in the culture medium containing 0.3% of keratan sulfate. Endo-beta-galactosidase was purified by an improved purification procedure involving Amicon H1P10 hollow fiber filtration, QAE-Sephadex A-50, and CM-Sephadex C-50 chromatographies. The purified enzyme is completely free from proteases and exoglycosidases. The general properties of this enzyme are: molecular weight, 28,000; optimal pH, 5.5 TO 5.8; PI, pH 8.0. This enzyme hydrolyzed keratan sulfates isolated from different sources to produce 6-O-sulfo-GlcNAc beta1 leads to 3Gal as the major product. In addition, the specificity of this enzyme toward various glycoconjugates was also studied.
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313
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Hsieh KH, Chuang CM, Li SC, Lue HC, Lee TC. Complement activation by iodinated contrast media. Zhonghua Min Guo Wei Sheng Wu Ji Mian Yi Xue Za Zhi 1980; 13:115-120. [PMID: 7449528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Activation of the complement system by iodinated contrast medium (ICM) infusion was studied in 25 children with congenital heart disease who received 76% Urographin during angiocardiographic studies. Total hemolytic activity (CH50), C1q, C3, C4 and C3 activator were determined before and 2, 5, 10, 15 and 20 minutes after Urographin infusion. Results showed that CH50 decreased in 16 patients (64%), C3 in 12 patients (48%), C3 activator in 12 patients (48%), C1q in 11 patients (44%) and C4 in 11 patients (44%). No side effect was encountered in all patients. It is therefore concluded that both the classic and alternative complement pathways could be activated by ICM and no causal relationship could be found between the presence of complement activation and the occurrence of adverse reactions to ICM infusion.
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315
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Li SC, Nakamura T, Ogamo A, Li YT. Evidence for the presence of two separate protein activators for the enzymic hydrolysis of GM1 and GM2 gangliosides. J Biol Chem 1979; 254:10592-5. [PMID: 115863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Two different protein activators were isolated simultaneously from human liver for the enzymic hydrolysis of GM1 (Gal beta 1 leads to 3GalNAc beta 1 leads to 4Gal(3 comes from 2 alpha NeuAc)beta 1 leads to 4Glc-Cer) by beta-galactosidase and GM2 (GalNAc beta 1 leads to 4Gal(3 comes from 2 alpha NeuAc)beta 1 leads to 4Glc-Cer) by beta-hexosaminidase A. The hydrolysis of GM1 is stimulated only by the GM1-specific activator which has very little effect on the hydrolysis of GM2. The same is also true for the hydrolysis of GM2. The antiserum raised against GM1 activator did not cross-react with GM2 activator and vice versa. These results suggest the presence of two different activators for the separate hydrolysis of GM1 and GM2. In connection with the enzymic hydrolysis of GM1 and GM2, we found that the hydrolysis of GM2 by human hepatic beta-N-acetylhexosaminidase A was severely inhibited by a buffer of high ionic strength, whereas no such inhibition was observed in the hydrolysis of GM1 by beta-galactosidase.
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316
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317
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Chien JL, Li SC, Li YT. Isolation and characterization of a heptaglycosylceramide from bovine erythrocyte membranes. J Lipid Res 1979; 20:669-73. [PMID: 490044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
A heptaglycosylceramide was isolated from bovine erythrocyte membranes. The structure was characterized to be Gal(alpha 1-3)Gal(beta 1-4)GlcNAc(beta1-3)Gal(beta 1-4)Glc-NAc(beta 1-4)al(beta 1-4)GlcCer. A hexaglycosylceramide that has the same sequence except for the terminal alpha-galactosyl unit has also been isolated. We have previously found that gangliosides isolated from bovine erythrocyte membranes contain a keratan sulfate type repeating unit --[3Gal(beta 1-4)-GlcNAc beta]--n. This study shows that the keratan sulfate type repeating unit is also present in the neutral glycosphingolipids of bovine erythrocyte membranes.
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318
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Koerner TA, Cary LW, Li SC, Li YT. Carbon 13 NMR spectroscopy of a cerebroside. Proof of the beta-pyranosyl structure of D-glucosylceramide. J Biol Chem 1979; 254:2326-8. [PMID: 429287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The first 13C nuclear magnetic resonance spectrum of a cerebroside is reported. All signals of D-glucosylceramide (I), the cerebroside from human Gaucher's diseased liver, have been assigned by comparison of their chemical shifts with those of model compounds. This data has been used to demonstrate for the first time directly: (a) that the glucosyl moiety must exist in the pyranoside ring form and have a beta anomeric linkage, and (b) that the fatty acyl composition of the aglycon is: alpha-hydroxy, 0%; saturated, 86 +/- 2%; unsaturated long chain, 14 +/- 2%; and unsaturated short chain, less than or equal to 2%. The use of 13C signal shifts in the delta 80 to 120 region (anomeric window) for the assignment of glycon anomeric and ring forms demonstrated herein should be applicable to other glycoconjugates.
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319
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Abstract
Chicken egg yolk was found to contain a unique glycosphingolipid pattern not seen in other types of tissue or cell. These glycosphingolipids were isolated in pure form and their structures established by sequential enzymic hydrolysis and permethylation analysis. The major gangliosides in chicken egg yolk are N-acetylneuraminosylgalactosylceramide, N-acetylneuraminosyl-lactosylceramide and di-N-acetylneuraminosyl-lactosylceramide. The only neutral glycosphingolipid found in chicken egg yolk is galactosylceramide.
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Abstract
The urine of patients with proteinuria of various etiologies was examined to determine if proteinuria alone was associated with significant glycosphingolipiduria. In all cases of proteinuria examined, the level of glycosphingolipids in the urine was found to be markedly elevated. There was no evidence of a glycosphingolipid storage disorder in any case. It was concluded that significant glycosphingolipiduria may occur in proteinuria as well as in the glycosphingolipid storage disorders.
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321
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Chien JL, Li SC, Laine RA, Li YT. Characterization of gangliosides from bovine erythrocyte membranes. J Biol Chem 1978; 253:4031-5. [PMID: 649619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Two glucosamine-containing gangliosides, sialosylhexaglycosylceramides, were isolated from bovine erythrocyte membranes. Both gangliosides were hydrolyzed by neuraminidase isolated from Clostridium perfringens to become neutral hexaglycosylceramides. Based on the results of sequential enzymatic hydrolysis and gas chromatography-mass spectrometric analyses of the methylated sugars, the structures of these two gangliosides were shown to be NeuAcalpha2 leads to 3Galbeta1 leads to 4GlcNAcbeta1 leads to 3Galbeta1 leads to 4GlcNAcbeta1 leads to 3Galbeta1 leads to 4Glc-ceramide and NeuGcalpha2 leads to 3Galbeta1 leads to 4GlcNAcbeta1 leads to 3Galbeta1 leads to 4GlcNAcbeta1 leads to 3Galbeta1 leads to 4Glc-ceramide, respectively. In addition, N-acetyl- and N-glycolylneuraminosyllacto-N-neotetraosylceramides, and N-acetyl- and N-glycolylneuraminosyllactosylceramides were also found in bovine erythrocytes. The predominant fatty acids in these two gangliosides were C 22:0 and C 24:0. C-18 sphingosine was the major base detected.
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Li YT, Wan CC, Chien JL, Li SC. Specificity of some exo- and endo-beta-galactosidases toward glycosphingolipids. Adv Exp Med Biol 1978; 101:537-44. [PMID: 96664 DOI: 10.1007/978-1-4615-9071-2_49] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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323
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Peters SP, Coffee CJ, Glew RH, Lee RE, Wenger DA, Li SC, Li YT. Isolation of heat-stable glucocerebrosidase activators from the spleens of three variants of Gaucher's disease. Arch Biochem Biophys 1977; 183:290-7. [PMID: 907355 DOI: 10.1016/0003-9861(77)90442-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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324
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Uda Y, Li SC, Li YT. alpha-N-acetylgalactosaminidase from the limpet, Patella vulgata. J Biol Chem 1977; 252:5194-200. [PMID: 18458] [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: 12/12/2022] Open
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325
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Uda Y, Li SC, Li YT. alpha-N-acetylgalactosaminidase from the limpet, Patella vulgata. J Biol Chem 1977. [DOI: 10.1016/s0021-9258(19)63330-2] [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: 10/22/2022] Open
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326
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Wan CC, Muldrey JE, Li SC, Li YT. beta-Mannosidase from the mushroom Polyporus sulfureus. J Biol Chem 1976; 251:4384-8. [PMID: 6478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
beta-D-Mannosidase (EC 3.2.1.25), a useful tool for the structural studies of heterosaccharide chains, has been isolated in a highly purified form from the fruiting bodies of the mushroom Polyporus sulfureus. This mushroom is unique among reported sources of this enzyme in that it has the advantage of being almost free of alpha-mannosidase activity. The purification procedure involves ammonium sulfate fractionation followed by Sephadex G-100 filtration and chromatography on columns of DEAE-cellulose and hydroxylapatite. The final enzyme preparation gives essentially a single band on disc gel electrophoresis. The purified enzyme liberates the beta-D-mannopyranosyl unit from various natural substrates such as the core glycopeptide, Man(GlcNAc)2-Asn isolated from ovalbumin, from Taka-amylase A, and from human alpha1-acid glycoprotein. It also hydrolyzes (Man)2-GlcNAc from the urine of an alpha-mannosidosis patient, 1,4-D-mannobiose and mannotriose isolated from ivory nut mannan, 4-O-beta-D-mannopyranosyl-L-rhamnose, 6-O-beta-D-mannopyranosyl-D-galactose and 4-O-beta-D-mannopyranosyl-N-acetylglucosamine. The molecular weight of this enzyme is estimated to be about 64,000 by gel filtration. For p-nitrophenyl-beta-D-mannopyranoside, the pH optimum is between 2.4 and 3.4 and the Km is 1.6 mM.
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Li SC, Li YT. An activator stimulating the enzymic hydrolysis of sphingoglycolipids. J Biol Chem 1976; 251:1159-63. [PMID: 814123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
An activator stimulating the enzymic hydrolysis of sphingoglycolipids has been purified from human liver. The purity of the activator, as examined by disc gel electrophoresis, showed one major band stained with both amido black and periodate-Schiff reagent. Chemical analyses identify the activator as a glycoprotein. The physical properties of the activator are: heat-stable, nondialyzable; molecular weight, about 21,000; isoelectric point (pI), 4.1. The purified activator stimulates the hydrolysis of GM1 by beta-galactosidase, GM2 by beta-hexosaminidase, as well as ceramide trihexoside by alpha-galactosidase A or B. The hydrolysis by glycosidases depends upon the amount of activator added. An antibody against the activator was developed from rabbits. The specificity of the antibody to the activator has been established. The antibody was used to make the affinity column for isolation of the activator. It was also used to develop a sensitive immunodiffusion method to detect the activator.
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329
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Li SC, Mazzotta MY, Chien SF, Li YT. Isolation and characterization of jack bean beta-galactosidase. J Biol Chem 1975; 250:6786-91. [PMID: 239949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
A simple procedure has been devised to isolate beta-galactosidase from jack bean meal. The final preparation gives one major protein banc in disc gel electrophoresis. The substrate specificity of this enzyme toward some natural oligosaccharides, glycoproteins, and sphingoglycolipids has been examined in detail. Among three isomers of N-acetyllactosamine, Galbeta1leads to4GlcNAc; while Galbeta1leads to3GlcNAc was hydrolyzed very slowly. This property can be used to distinguish the galactose linkage in asialo-GM1 (Galbeta1leads to3GalNAcbeta1leads to4Galbeta1leads to4Glcleads toCer) and that in lacto-N-neotetraosylceramide (Galbeta1leads to4GlcNAcbeta1leads to 3Galbeta1leads to4Glcleads toCer). For hydrolyzing glycolipids, the effect of sodium taurodeoxycholate and sodium taurochenodeoxycholate on the rate of hydrolysis was carefully examined. This enzyme hydrolyzes lactosylceramide and asialo-GM1 faster than GM1. These results suggest that in addition to the type and linkage of the penultimate sugar unit, the sugar unit at the distal position of the saccharide chain also affects the hydrolysis rate. It also readily liberates 80% D-galactosyl units from asialo alpha1-acid glycoprotein. Escherichia coli beta-galactosidase on the other hand cannot hydrolyze asialo-alpha1-acid glycoprotein, lactosylceramide, GM1, asialo-GM1, and lacto-N-neotetraosylceramide. The molecular weight of this enzyme is about 75,000 and the isoelectric point is pH 8.0. With p-nitrophenyl beta-D-galactopyranoside as substrate, optimal activity occurs at pH 2.8 with glycine-HCl buffer and at pH 3.5 with citrate-phosphate buffer. With lactose as substrate, the pH optimum in these two buffers are 2.8 and 4.0, respectively. Km values for p-nitrophenyl beta-D-galactopyranoside, o-nitrophenyl beta-D-galactopyranoside and lactose are 0.51 mM, 0.63 mM, and 12.23 mM, respectively. Many inhibitors for this enzyme including inorganic ions, monosaccharides, and glycosides are investigated. In contrast to E. coli beta-galactosidase, jack bean beta-galactosidase is not inhibited by p-aminophenyl thio-beta-D-galactopyranoside.
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Riopelle AJ, Hill CW, Li SC. Protein deprivation in primates. V. Fetal mortality and neonatal status of infant monkeys born of deprived mothers. Am J Clin Nutr 1975; 28:989-93. [PMID: 1163481 DOI: 10.1093/ajcn/28.9.989] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Seventy-four pregnancies were followed in 45 rhesus monkeys. While pregnant the mothers were fed a semisynthetic diet affording 1, 2, or 4 g protein/kg per day. The poorer diets tended to produce excess fetal mortality, but liveborn infants born to 1-g and 2-g mothers averaged as large as those in the 4-g group. No differences existed in total protein concentration and albumin-globulin ratios in the sera of newborn infants.
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Smith EL, McKibbin JM, Karlsson KA, Pascher I, Samuelsson BE, Li SC. Characterization of dog small intestinal fucolipids with human blood group H activity. Biochemistry 1975; 14:3370-6. [PMID: 1148206 DOI: 10.1021/bi00686a013] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Fucolipids with human blood group H activity were isolated from several dog small intestines. On the basis of mass spectrometry, periodate oxidation, enzyme degradation, methylation, and immunologic studies the following structure is proposed: Fucalpha(1 yields2)Galbeta(1 yields 4)Glc-NAcbeta(1 yields 3)Galbeta(1 yields 4)Glc-ceramide. The ceramide was shown by mass spectrometry to contain hydroxyhexadecanoic acid and phytosphingosine as major consitutuents.
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333
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Chien SF, Yevich SJ, Li SC, Li YT. Presence of endo-beta-N-acetylglucosaminidase and protease activities in the commercial neuraminidase preparations isolated from Clostridium perfringens. Biochem Biophys Res Commun 1975; 65:683-91. [PMID: 167779 DOI: 10.1016/s0006-291x(75)80200-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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334
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Romeo G, Di Matteo G, D'urso M, Li SC, Li YT. Characterization of human alpha-galactosidase A and B before and after neuraminidase treatment. Biochim Biophys Acta 1975; 391:349-60. [PMID: 167833 DOI: 10.1016/0005-2744(75)90259-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
It has been previously reported that following neuraminidase treatment alpha-galactosidase A is converted into the B form, as revealed by electrophoresis. By a variety of techniques such as isoelectrofocusing, DEAE-chromatography and by enzyme kinetic parameters, no conversion of alpha-galactosidase A into B, or the reverse, could be detected after neuraminidase treatment. Only an apparent transformation of alpha-galactosidase A into B was revealed by Cellogel electrophoresis. In addition, a discrepancy was noticed between the pattern of electrophoretic migration on starch gel and Cellogel and the net electrical charges of the two alpha-galactosidases as deduced by isoelectrofocusing and DEAE-cellulose. Neuraminidase treatment did not affect the activity of alpha-galactosidase A towards the natural substrate, ceramidetrihexoside, but the activity of alpha-galactosidase B decreased by about 30% under the same conditions. The two forms of alpha-galactosidases A and B used in this study were extensively purified by classical procedures.
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335
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Abstract
Young adult female rhesus monkeys, maintained in a seminatural environment, when pregnant 30 days were fed a balanced semisynthetic diet containing 15.3 percent casein (13.4 percent protein) or 0.5, or 0.25 that amount for the remainder of thir pregnancy. The diets, made isocaloric by the addition of carbohydrates to replace the missing casein, supplied 4, 2, or 1 g protein/kg per day if the animals ate 120 kcal/kg per day, an assumption that was reasonably accurate. We studied the responses of monkeys delivering normal young at term. All monkeys were clinically healthy during the experiment. All reduced their total plasma protein concentration, principally by decreasing their albumin concentration. Greatest loss occurred in the low-protein group. Albuminuria was a common finding in all groups. Food consumption though varying throughout pregnancy, remained fairly comparable from group to group. Weight gain of the highest protein group was greatest; that for the lowest protein group barely covered the weight of the products of conception. Blood pressure declined during pregnancy while blood glucose rose. There were no morphologic changes in hair bulbs and only suggestive changes in liver cells that pointed to increased vacuolation. Increased metabolic efficiency during pregnancy enables the mother to safely pass through a long pregnancy during most of which she is fed a low-protein diet. Nonpregnant aminals suffer more under the same circumstances.
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336
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Li SC, Wan CC, Mazzotta MY, Li YT. Requirement of an activator for the hydrolysis of sphingoglycolipids by glycosidases of human liver. Carbohydr Res 1974; 34:189-93. [PMID: 4835697 DOI: 10.1016/s0008-6215(00)80383-3] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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337
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Riopelle AJ, Hill CW, Li SC, Wolf RH, Seibold HR, Smith JL. Protein deprivation in primates. I. Nonpregnant adult rhesus monkeys. Am J Clin Nutr 1974; 27:13-21. [PMID: 4358390 DOI: 10.1093/ajcn/27.1.13] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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338
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Li YT, Mazzotta MY, Wan CC, Orth R, Li SC. Hydrolysis of Tay-Sachs ganglioside by beta-hexosaminidase A of human liver and urine. J Biol Chem 1973; 248:7512-5. [PMID: 4745777] [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: 01/12/2023] Open
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339
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340
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Tarcsay L, Wang CS, Li SC, Alaupovic P. Composition and structure of the O-specific side chain of endotoxin from Serratia marcescens 08. Biochemistry 1973; 12:1948-55. [PMID: 4350107 DOI: 10.1021/bi00734a018] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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341
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Li YT, Li SC, Dawson G. Anomeric structure of ceramide digalactoside isolated from the kidney of a patient with Fabry's disease. Biochim Biophys Acta 1972; 260:88-92. [PMID: 5012456] [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: 01/13/2023]
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342
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Li YT, Li SC. Anomeric configuration of galactose residues in ceramide trihexosides. J Biol Chem 1971; 246:3769-71. [PMID: 5104445] [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: 01/13/2023] Open
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343
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Hakomori SI, Siddiqui B, Li YT, Li SC, Hellerqvist CG. Anomeric structure of globoside and ceramide grihexoside of human erythrocytes and hamster fibroblasts. J Biol Chem 1971; 246:2271-7. [PMID: 5103071] [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: 01/13/2023] Open
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344
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345
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Li SC, Li YT. Studies on the glycosidases of jack bean meal. 3. Crystallization and properties of beta-N-acetylhexosaminidase. J Biol Chem 1970; 245:5153-60. [PMID: 5506280] [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: 01/15/2023] Open
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346
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Li YT, Li SC. Isolation and characterization of alpha 1-acid glycoprotein from chimpanzee plasma. J Biol Chem 1970; 245:825-32. [PMID: 4984628] [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: 01/13/2023] Open
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347
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Suzuki H, Li SC, Li YT. Alpha-galactosidase from Mortierella vinacea. Crystallization and properties. J Biol Chem 1970; 245:781-6. [PMID: 5418105] [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: 01/15/2023] Open
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348
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349
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Li YT, Li SC. Studies on the glycosidases in jack bean meal. II. Sepation of various glycosidases by isoelectric focusing. J Biol Chem 1968; 243:3994-6. [PMID: 5661719] [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: 01/16/2023] Open
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350
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Li SC, Li YT. The protein and protein-bound carbohydrates in 4 species of nonhuman primates' sera. Proc Soc Exp Biol Med 1968; 127:1014-7. [PMID: 4968434 DOI: 10.3181/00379727-127-32858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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