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Chaudhary VK, Xu YH, FitzGerald D, Adhya S, Pastan I. Role of domain II of Pseudomonas exotoxin in the secretion of proteins into the periplasm and medium by Escherichia coli. Proc Natl Acad Sci U S A 1988; 85:2939-43. [PMID: 3283735 PMCID: PMC280118 DOI: 10.1073/pnas.85.9.2939] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Pseudomonas exotoxin (PE) is composed of structural domains I, II, and III; when interacting with mammalian cells the function of domain I is cell recognition, the function of domain II is membrane translocation, and domain III functions in ADP ribosylation. PE is secreted by Pseudomonas aeruginosa into its growth medium. The domain responsible for secretion has been examined by expressing modified PE genes in Escherichia coli under the control of a T7 promoter. Without a signal sequence, PE accumulates within the cell, but PE is secreted into the periplasm when part or all of domain I is removed. PE appears in the periplasm and medium when domain I and part of domain II are removed. Domain II alone is secreted into the periplasm, whereas domain III alone remains within the cell. Addition of an OmpA signal sequence results in secretion of mature PE into the periplasm and secretion of domains II-III into the medium. A protein composed of transforming growth factor alpha fused to the amino terminus of domains II-III is secreted into the periplasm without a signal sequence and into the medium with a signal sequence. A protein composed of domain(s) II or II-III fused to the amino terminus of alkaline phosphatase is secreted into the periplasm and the medium with or without a signal sequence. We conclude that domain II contains important information for protein secretion.
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177
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Lai MD, Xu YH. Effects of bisulfite and sulfite on Fc and Con A receptors of rat pulmonary macrophages. Chin Med J (Engl) 1988; 101:357-60. [PMID: 3145837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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178
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Xu YH, Liu J, Zhang SP, Liu LH. The effect of berbamine derivatives on activated Ca2+-stimulated Mg2+-dependent ATPase in erythrocyte membranes. Biochem J 1987; 248:985-8. [PMID: 2963623 PMCID: PMC1148650 DOI: 10.1042/bj2480985] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Ca2+-stimulated Mg2+-dependent ATPase (Ca2+ + Mg2+-ATPase) stimulated by calmodulin, by partial proteolysis or by oleic acid in erythrocyte membranes was inhibited by various derivatives of the naturally occurring alkaloid berbamine. The ability of these derivatives to inhibit trypsin-activated Ca2+ + Mg2+-ATPase correlated well with their ability to inhibit the calmodulin-stimulated enzyme. Inhibition of the trypsin-activated Ca2+ + Mg2+-ATPase by O-4-(ethoxybutyl)berbamine (EBB) was competitive with respect to ATP. The Ki for inhibition was about 8 microM. These results suggest that the binding site of EBB on the activated Ca2+ + Mg2+-ATPase may bear structural similarity to that on calmodulin, and may be closely related to the ATP-binding site on the enzyme.
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179
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Xu YH, Wu ZB. Ultrastructural distribution of fibronectin in murine liver: preembedding localization with protein A-gold technique. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1987; 7:202-7. [PMID: 3448248 DOI: 10.1007/bf02888444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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180
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Tang ZC, Xu YH. Comparison of the effects of 4-methylhistamine on the cell-cycle response between CFU-s and its subpopulation. INTERNATIONAL JOURNAL OF CELL CLONING 1987; 5:511-7. [PMID: 3429935 DOI: 10.1002/stem.5530050609] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
When bone marrow cells were treated with an H2-receptor agonist (4-methylhistamine 10(-8) M) before treatment with hydroxyurea (10(-3) M), the suicide rate of spleen colony-forming units (CFU-s) as a whole rose significantly. The rabbit antimouse brain serum (RAMBS)-resistant CFU-s subpopulation was also significantly elevated. Prior treatment of bone marrow cells with cimetidine would prevent this effect of 4-methylhistamine (4-MH). These findings not only confirm that 4-MH can trigger mouse bone marrow CFU-s to enter a DNA synthetic phase of the cell cycle, but also suggest that the RAMBS-resistant CFU-s subpopulation is more sensitive to the effect of 4-MH. Furthermore, this suggests that concentrations of the histamine receptor change during the developmental process of CFU-s.
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181
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Chen SL, Xu YH, Shi SY. [Diagnostic criteria for systemic lupus erythematosus in Chinese patients]. ZHONGHUA NEI KE ZA ZHI 1987; 26:533-6, 565. [PMID: 3450475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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182
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Xu YH, Luo RS, Wang TY. Preferential binding of androgen to transcriptionally active chromatin in rat prostate. JOURNAL OF STEROID BIOCHEMISTRY 1987; 26:647-52. [PMID: 3613567 DOI: 10.1016/0022-4731(87)91036-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Rat ventral prostate chromatin was fractionated by the Micrococcal nuclease procedure of Berkowitz and Riggs (Biochemistry 20, 7284-7290, 1981). Four chromatin fractions were obtained and analyzed by gel electrophoresis for their protein and DNA components, by hybridization of their DNAs with an androgen regulated cDNA for transcribed DNA sequence, and by [3H]dihydrotestosterone exchange assay and steroid competition experiment for specific androgen binding. All four chromatin fractions contained a complete complement of histones and DNA in multiples of about 200 base pairs, indicating repeating nucleosome structure. The active chromatin fraction, which has the shortest nucleosome repeats of 186 basepairs, was enriched in the androgen regulated sequence and bound androgen. These results correlate androgen binding sites with transcribed DNA sequence and structurally distinctive domain of chromatin in the rat prostate.
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183
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Xu YH, Zhou XJ, Sheng SL, Wu ZB. Immunohistochemical localization of fibronectin and laminin in murine liver using protein A-gold technique at light microscopic level--a methodological study. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1987; 7:74-9. [PMID: 3309354 DOI: 10.1007/bf02888165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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184
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Shen SL, Xu YH, Wu ZB. Scanning electron microscopical study of intrahepatic blood vessels during development of experimental cirrhosis in rats. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1986; 6:235-40. [PMID: 3806743 DOI: 10.1007/bf02909751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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185
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Xu YH, Peters RL. Hepatocellular carcinoma and lupoid hepatitis (an autopsy study). JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1986; 6:215-20. [PMID: 3027356 DOI: 10.1007/bf02909748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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186
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Chen SE, Gu YY, Xu YH. [Anti-centromere antibody (ACA) and its significance for the diagnosis of CREST syndrome]. ZHONGHUA NEI KE ZA ZHI 1986; 25:736-8, 776. [PMID: 3494576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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187
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Xu YH, Zhang SP. A derivative of bisbenzylisoquinoline alkaloid is a new and potential calmodulin antagonist. Biochem Biophys Res Commun 1986; 140:461-7. [PMID: 3022722 DOI: 10.1016/0006-291x(86)91113-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A new derivative of bisbenzylisoquinoline (berbamine type): 0-(4-ethoxylbutyl) berbamine (EBB) was found to possess powerful and specific calmodulin (CaM) inhibitory properties. It inhibited CaM-stimulated Ca2+-Mg2+-ATPase in human erythrocyte membrane with IC50 value of 0.35 microM compared to that of 60 microM of berbamine. CaM-independent basal Ca2+-Mg2+-ATPase, Na+-K+-ATPase and Mg2+-ATPase were not effect at 1.0 microM of EBB at which CaM-dependent Ca2+-Mg2+-ATPase was already potently inhibited. The inhibition of CaM-dependent Ca2+-Mg2+-ATPase was competitive with respect to CaM. Higher amount of CaM reversed the inhibition caused by higher concentration of EBB. Using dansyl-CaM (D-CaM), it was shown that EBB binds directly to CaM and caused a conformational change of CaM polypeptide chain. From fluorescence titration curve we obtained evidence that in the presence of Ca2+, CaM has two specific binding sites for EBB and additional unspecific binding sites. The Ca2+-dependent binding sites of EBB on CaM were novel region different from the binding sites for TFP.
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188
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Xu YH. [The pathologic basis of egg-shell calcification of hilar and peritracheo-bronchial lymph nodes in silicosis]. ZHONGHUA JIE HE HE HU XI XI JI BING ZA ZHI = CHINESE JOURNAL OF TUBERCULOSIS AND RESPIRATORY DISEASES 1986; 9:288-9, 319. [PMID: 3803090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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189
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Xu YH, Peters RL. The morphological spectrum of peripheral intrahepatic cholangiocarcinoma--an attempt at histological classification of twenty-eight autopsy cases. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1986; 6:144-50. [PMID: 3021966 DOI: 10.1007/bf02911451] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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190
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Lu TC, Xu YH. [Effect of cyclophosphamide on the morphology and function of alveolar macrophages in the development of silicosis]. ZHONGHUA BING LI XUE ZA ZHI = CHINESE JOURNAL OF PATHOLOGY 1986; 15:114-8. [PMID: 2946442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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191
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Wang TY, Chamberlin LL, Xu YH. Characterization of the androgen-dependent 22Kdalton glycoprotein from rat ventral prostate. JOURNAL OF STEROID BIOCHEMISTRY 1986; 24:929-32. [PMID: 3702466 DOI: 10.1016/0022-4731(86)90456-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Oxidation by molecular oxygen converted the 22Kdalton glycoprotein from rat ventral prostate into a 34K species and this reaction could be reversed by thiol reducing reagent. Measurement of the level of the 22Kdalton glycoprotein in prostatic cytosol by the radial immunodiffusion technique showed that changes in the 22Kdalton glycoprotein concentration in response to androgen withdrawal and replacement were slow in comparison to androgen regulated levels of mRNA coding for the protein. (3) Charcoal absorption steroid binding assays of the 22Kdalton glycoprotein revealed that the protein did not bind testosterone, estradiol, progesterone or corticosterone. These results indicate that the 22Kdalton glycoprotein is metabolically stable, not steroid-binding, and exists as an oligomer through disulfide crosslinking.
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192
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Xu YH, Wu ZB. The ultrastructure of intrahepatic bile ducts in primary biliary cirrhosis. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1986; 6:37-42. [PMID: 3712519 DOI: 10.1007/bf02911616] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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193
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Xu YH, Peters RL. Mitochondrial abnormalities in hepatocytes adjacent to fibrolamellar hepatocellular carcinoma. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1986; 6:26-30. [PMID: 3012105 DOI: 10.1007/bf02911614] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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194
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Xu YH, Ito S, Peters RL. Immunohistochemical demonstration of alpha-1-antitrypsin in renal tubular epithelia in patients with or without alpha-1-antitrypsin deficiency. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1986; 6:31-6. [PMID: 3519999 DOI: 10.1007/bf02911615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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195
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Wu CQ, Xu YH. [Effect of coal particles on the pulmonary macrophage of rabbits in vitro]. ZHONGHUA BING LI XUE ZA ZHI = CHINESE JOURNAL OF PATHOLOGY 1986; 15:57-61. [PMID: 3022950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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196
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Graham DE, Xu YH, Ishii S, Merlino GT. 'Northern Cross' hybridization for rapid identification of exon-containing restriction fragments. Gene 1986; 48:241-9. [PMID: 2435618 DOI: 10.1016/0378-1119(86)90082-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The Northern Cross method allows direct comparison of restriction digests of cDNA and genomic clones to RNA populations by a specialized form of hybridization. This technique is based on the use of Northern and Southern blotting techniques and requires the use of two nylon membranes of differing chemical characteristics. A nylon membrane containing permanently affixed, electrophoretically fractionated RNAs is contact-hybridized at a right angle to a second, chemically different nylon membrane containing transiently bound, fractionated labeled DNA fragments. RNA and DNA bands possessing homology will hybridize where they cross, forming an autoradiographically detectable spot. This Northern Cross procedure proportionately represents the amounts of different RNAs derived from a particular sequence in a manner similar to what would have been observed in a Northern blot. This method, which can be used in the analysis of even relatively rare RNA species, permits rapid and fairly inexpensive identification of exon-containing fragments or determination of the relationship between related, multiple RNA species.
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197
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Xu YH, Peters RL. [Immunohistochemical demonstration of alpha-1-antitrypsin in renal tubular epithelium of patients with and without alpha-1-antitrypsin deficiency]. ZHONGHUA BING LI XUE ZA ZHI = CHINESE JOURNAL OF PATHOLOGY 1985; 14:289-92. [PMID: 2936490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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198
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Hu XT, Xu YH. [Advances in the study of the receptors and surface antigens of hematopoietic stem cells]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1985; 16:329-33. [PMID: 3016886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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199
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Xu YH. [The pathological aspects of hepatic venous outflow obstruction]. ZHONGHUA BING LI XUE ZA ZHI = CHINESE JOURNAL OF PATHOLOGY 1985; 14:165-8. [PMID: 2936470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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200
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Hunts JH, Shimizu N, Yamamoto T, Toyoshima K, Merlino GT, Xu YH, Pastan I. Translocation chromosome 7 of A431 cells contains amplification and rearrangement of EGF receptor gene responsible for production of variant mRNA. SOMATIC CELL AND MOLECULAR GENETICS 1985; 11:477-84. [PMID: 2994239 DOI: 10.1007/bf01534841] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The epidermal growth factor (EGF) receptor, along with several oncogene protein products, possesses tyrosine-specific protein kinase activity. Furthermore, the EGF receptor has structural similarity to the putitive v-erb-B transforming protein. Because of these closely shared characteristics, it is important to elucidate the possible involvement of the EGF receptor in malignant transformation. The epidermal carcinoma cell line A431 exhibits an abnormally high number of EGF receptors, which is associated with the presence of translocation chromosome M4. Recently, A431 cells have been shown to contain amplified sequences for the EGF receptor gene(s) and also to produce a variant mRNA which diverges from the normal EGF receptor mRNA at the 3' end. Here we report, using the human EGF receptor cDNA probe pE7, that the chromosome M4 has a six- to sevenfold amplification of the EGF receptor gene. Furthermore, the presence of M4 in somatic cell hybrids correlates with the production of the variant 2.9-kb mRNA. This aberrant mRNA is apparently generated by an intrachromosomal rearrangement which was detected using as a probe a fragment of the pE15cDNA encoding the variant mRNA.
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