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Bose SK. Probable mechanism of varicella-induced koebnerization in psoriasis. Indian J Dermatol Venereol Leprol 1995; 61:70-71. [PMID: 20952895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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Abstract
Vitiligo is frequently associated with segmental involvement. It spares paralyzed limbs in transverse myelitis. There is spontaneous repigmentation of vitiligo lesional skin (VL) in diabetic neuropathy. Increased neuropeptide in VL and adjacent normal skin of vitiligo (ANS) along with thickened nerve fibers showing ultrastructural abnormalities all indicate a neural pathogenesis (1). Loss of Merkel cells has been observed in early vitiligo lesional skin (2). Recently, catecholamines have been found to play a major role in initiating the cascade of events leading to loss of melanocytes (1, 3, 4). To investigate the presence of Merkel cells in the completely depigmented skin of stable vitiligo (SV), a study was undertaken using TROMA 1, a monoclonal antibody specific for adult Merkel cells. No TROMA 1-positive cells were observed in SV, whereas normal numbers of these cells were seen in ANS. This new finding further supports the hypothesis of neural involvement in vitiligo.
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Abstract
BACKGROUND In vitiligo, other than loss of melanocytes and melanin pigment in the lesional skin, keratinocytes are also involved. Human fetal Merkel cells are now generally considered to be derived from the epidermis. To date, no observations on Merkel cells in lesional skin of active vitiligo have been reported. METHODS Merkel cells were identified by indirect immunofluorescence microscopy using the monoclonal antibody TROMA 1. RESULTS No TROMA 1-positive cells were observed in the vitiliginous skin lesions in any of the specimens examined, whereas normal numbers of these cells were seen in the adjacent pigmented skin. CONCLUSIONS This finding suggests that the processes that lead to damage of keratinocytes in vitiligo also involve other keratin-expressing cells such as the Merkel cells.
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Bose SK, Ortonne JP. Focal gaps in the basement membrane of involved and uninvolved skin of vitiligo: are they normal? J Dermatol 1994; 21:152-9. [PMID: 8014268 DOI: 10.1111/j.1346-8138.1994.tb01713.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
It has been suggested that, in vitiligo, the structural abnormalities may not be restricted to melanocytes alone, but also to keratinocytes of involved and uninvolved skin. Focal gaps in the vitiligo epidermal basement membrane have been furthermore interpreted as evidence of extramelanocyte alterations. To understand the occurrence of the gaps we undertook a study to establish which cells are related to them. Immunofluorescence and immunoperoxidase techniques were used to visualize, in involved, uninvolved, and control skin, the basement membrane, melanocytes, and Merkel cells. Double staining was performed with fluorescein-coupled anti-collagen IV antibodies and rhodamin-coupled antibodies against Nicein (GB3), a hemidesmosome component. Propidium iodide staining was used to detect infiltrating lymphocytes. The basement membrane structure was always found to be intact and unaltered. Absence of staining in areas of uninvolved skin was related to the presence of Merkel cells, melanocytes, and infiltrating lymphocytes. Gaps in the epidermal basement membrane are thus due to lack of staining caused by the presence of immigrant cells.
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Nelson SK, Bose SK, McCord JM. The toxicity of high-dose superoxide dismutase suggests that superoxide can both initiate and terminate lipid peroxidation in the reperfused heart. Free Radic Biol Med 1994; 16:195-200. [PMID: 8005514 DOI: 10.1016/0891-5849(94)90143-0] [Citation(s) in RCA: 113] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Recently, we described an anomalous bell-shaped dose-response curve for the protection of the reoxygenated isolated myocardium by superoxide dismutase (SOD). SOD is dramatically protective up to a point (5 micrograms/ml in the perfusate) beyond which it loses its ability to protect and, at very high doses (50 micrograms/ml), exacerbates the injury. We proposed that O2-. may serve as both initiator and terminator of lipid peroxidation, such that over scavenging the radical may increase net lipid peroxidation via increased chain length. We examined the ability of U74389F, a lipid peroxidation inhibitor, to ameliorate the toxicity of high-dose SOD in the isolated perfused rabbit heart preparation. The results show a significant improvement in the percent recovery of developed tension of hearts treated with U74389F and overdosed with MnSOD, as well as a decrease in thiobarbituric acid reactive substances.
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Bose SK, Lacour JP, Bodokh I, Ortonne JP. Malignant lymphoma and dermatitis herpetiformis. Dermatology 1994; 188:177-81. [PMID: 8186505 DOI: 10.1159/000247134] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
We report 2 cases of dermatitis herpetiformis (DH) with lymphoma: a non-Hodgkin's malignant histiocytic lymphoma and a rare phenotype of Hodgkin's disease. With these 2 cases, 32 cases of DH complicated by lymphoma have now been documented. Reviewing the literature we show that the majority of lymphomas (78.1%) arises from the gastro-intestinal tract and that almost all cases of DH with lymphoma are associated with coeliac disease. The possible preventive role of a gluten-free diet is discussed.
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Hendler RW, Bose SK, Shrager RI. Multiwavelength analysis of the kinetics of reduction of cytochrome aa3 by cytochrome c. Biophys J 1993; 65:1307-17. [PMID: 8241410 PMCID: PMC1225850 DOI: 10.1016/s0006-3495(93)81170-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Some new approaches to the kinetic study of the reduction of cytochrome aa3 by cytochrome c are presented. The primary innovations are the use of a spectrometer which can acquire multiwavelength data as fast as every 10 microseconds, and the application of a variety of analytical methods which can utilize simultaneously all of the time-resolved spectral data. These techniques include singular value decomposition (SVD), deconvolutions based on pure Gaussian models for absorption peaks, deconvolutions based on isolated absorption spectra for the pure components, and simulations of SVD-deduced and actual experimental difference spectra. The reduction characteristics of the anaerobic resting enzyme can be distinguished from those of pulsed forms. In the former case, only two electrons can be bound by cytochrome aa3, whereas in the latter case complete reduction of the enzyme is achieved.
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Flores SC, Marecki JC, Harper KP, Bose SK, Nelson SK, McCord JM. Tat protein of human immunodeficiency virus type 1 represses expression of manganese superoxide dismutase in HeLa cells. Proc Natl Acad Sci U S A 1993; 90:7632-6. [PMID: 8395050 PMCID: PMC47196 DOI: 10.1073/pnas.90.16.7632] [Citation(s) in RCA: 174] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Using a HeLa cell line stably transfected with the tat gene from human immunodeficiency virus type 1, we have found that the expression of the regulatory Tat protein suppresses the expression of cellular Mn-containing superoxide dismutase (Mn-SOD). This enzyme is one of the cell's primary defenses against oxygen-derived free radicals and is vital for maintaining a healthy balance between oxidants and antioxidants. The parental HeLa cells expressed nearly equivalent amounts of Cu,Zn- and Mn-SOD isozymes. Those cells expressing the Tat protein, however, contained 52% less Mn-SOD activity than parental cells, whereas that of the Cu,Zn enzyme was essentially unchanged. The steady-state levels of Mn-SOD-specific RNAs were also lower in the HeLa-tat cell line than in the parental line. No difference was seen in the steady-state levels of Cu,Zn-SOD-specific RNAs. In addition to the decreased Mn-SOD-activity, HeLa-tat cell showed evidence of increased oxidative stress. Carbonyl proteins were markedly higher, and total cellular sulfhydryl content decreased in cell extracts at a faster rate, probably reflecting ongoing lipid peroxidation. HeLa and HeLa-tat extracts were incubated with radiolabeled Mn-SOD transcripts, and the reaction products were subjected to UV crosslinking, digestion with ribonuclease A, and electrophoretic analysis. The results suggest a direct interaction between Tat protein and Mn-SOD gene transcripts.
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Bose SK, Jepsen O, Andersen OK. Real-space calculation of the electrical resistivity of liquid 3d transition metals using tight-binding linear muffin-tin orbitals. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:4265-4275. [PMID: 10008897 DOI: 10.1103/physrevb.48.4265] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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62
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Kudrnovsk J, Turek I, Drchal V, Weinberger P, Bose SK, Pasturel A. Self-consistent Green's-function method for surfaces of random alloys. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:16525-16531. [PMID: 10006089 DOI: 10.1103/physrevb.47.16525] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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63
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Abstract
Vitiligo is a puzzling disorder characterized by a disappearance of epidermal and/or follicular melanocytes by unknown mechanisms. This very common disorder involving 1-4% of the world population is thus of great importance for the practicing dermatologist. The cellular and molecular mechanisms leading to the destruction of melanocytes in this disorder have not yet been elucidated, making it of major interest for the cell biologist involved in melanocyte research. Recent advances in this field, due largely to the availability of techniques for culturing normal human melanocytes, opened new perspectives in the understanding of vitiligo. Although vitiligo has long been considered a disorder confined to the skin, there is now good evidence that it also involves the extracutaneous compartment of the "melanocyte organ." It is also clear that vitiligo is not only a melanocyte disorder, but that it also involves cells, such as keratinocytes and Langerhans cells, found in the epidermis and follicular epithelium. The three prevailing theories of the pathogenesis of vitiligo are the immune hypothesis, the neural hypothesis, and the self-destruct hypothesis. New hypotheses suggest that vitiligo may be due to (1) a deficiency in an unidentified melanocyte growth factor, (2) an intrinsic defect of the structure and function of the rough endoplasmic reticulum in vitiligo melanocytes, (3) abnormalities in a putative melatonin receptor on melanocytes and (4) a breakdown in free radical defense in the epidermis. None of these hypotheses has been demonstrated, and according to the available data, it is likely that the loss of epidermal and follicular melanocytes in vitiligo may be the result of several different pathogenetic mechanisms.
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Bose SK, Satpathy S, Jepsen O. Semiconducting CsSnBr3. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:4276-4280. [PMID: 10006572 DOI: 10.1103/physrevb.47.4276] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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65
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Kudrnovsk J, Turek I, Drchal V, Weinberger P, Christensen NE, Bose SK. Self-consistent Green's-function method for random overlayers. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:4222-4228. [PMID: 10004153 DOI: 10.1103/physrevb.46.4222] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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66
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Kudrnovský J, Bose SK, Drchal V. Origins of surface alloy formation: Cu(001)c(2 x 2)-Pd as a case study. PHYSICAL REVIEW LETTERS 1992; 69:308-311. [PMID: 10046640 DOI: 10.1103/physrevlett.69.308] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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67
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Shukla RC, Bose SK, Delogu RF. Comparison of Monte Carlo and anharmonic-lattice-dynamics results for the thermodynamic properties and atomic mean-square displacement of Xe using the Morse potential. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:12812-12820. [PMID: 10001341 DOI: 10.1103/physrevb.45.12812] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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68
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Bose SK, Kudrnovsk J, Jepsen O, Andersen OK. Electronic structure of ordered and disordered CuxPd1-x alloys via the linear-muffin-tin-orbitals method. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:8272-8282. [PMID: 10000658 DOI: 10.1103/physrevb.45.8272] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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69
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Joseph TD, Bose SK. Surface components of HeLa cells that inhibit cytadherence of Chlamydia trachomatis. FEMS Microbiol Lett 1992; 70:177-80. [PMID: 1587463 DOI: 10.1016/0378-1097(92)90680-m] [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: 12/27/2022] Open
Abstract
Isolated HeLa plasma membrane (PM) preparations and extracts containing either cell-surface proteins or lipids were examined for inhibition of adherence of radiolabeled Chlamydia trachomatis serovar E elementary bodies to glutaraldehyde-fixed HeLa monolayers. A dose-dependent adherence-inhibitory activity could be demonstrated with the PM. A urea extract as well as lipids from HeLa cells also inhibited chlamydial cytadherence. The inhibitory activity of the PM was trypsin-sensitive. It was absent when the urea extract was prepared from trypsin-treated HeLa cells. The urea extract was subjected to electrophoresis and protein blotting using a native gel system. Probing with radiolabeled chlamydial cytadhesin showed a single protein present in the urea extract that could represent a HeLa cell protein receptor for the chlamydiae.
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Joseph TD, Bose SK. Further characterization of an outer membrane protein of Chlamydia trachomatis with cytadherence properties. FEMS Microbiol Lett 1991; 68:167-71. [PMID: 1663892 DOI: 10.1016/0378-1097(91)90122-q] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
To further characterize the chlamydial cytadhesin (CCA), we have examined it for saturability of binding to HeLa cells that were grown as monolayers and in suspension. The CCA exhibited specific cytadherence properties of binding to HeLa cells that appeared to be saturable. The CCA showed a substantial decrease in binding to trypsin-treated HeLa cells in suspension. This finding, together with the fact that the CCA itself is known to be trypsin-sensitive, suggested a protein-protein type of interaction between CCA and HeLa cells. Periodate treatment of the CCA did not result in significant reduction in cytadherence, which implies that sugar moieties were probably not involved in CCA binding to HeLa cells. Whilst attempts to produce antibodies to the CCA in rabbits was unsuccessful, the CCA reacted with antibodies in a human serum known to contain high titer antibodies to Chlamydia trachomatis, suggesting it can be immunogenic, and is possibly expressed during human infection.
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71
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Bhaduri S, Bose SK. Catabolite repression vs derepression, an approach to differentiation during sporulation in Bacillus subtilis. THE JOURNAL OF APPLIED BACTERIOLOGY 1991; 71:147-53. [PMID: 1655689 DOI: 10.1111/j.1365-2672.1991.tb02971.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Glutamine, like glucose, repressed sporulation and the synthesis of mycobacillin and dipicolinic acid by Bacillus subtilis, and these syntheses were depressed by dibutyryl cyclic GMP but not by dibutyryl cyclic AMP. Neither of these dibutyryl cyclic nucleotides affected sporulation or a number of spore-associated parameters in the strain under normal physiological conditions. Mutants insensitive to glutamine repression were indifferent to the addition of either of the dibutyryl cyclic nucleotides both in the presence and in the absence of glutamine. Sporulation resulted from the remission of repression obtained under the catabolically active state.
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72
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Kudrnovsk J, Bose SK, Jepsen O. Dependence of the electronic structure on local atomic order in ternary Cu2NiZn alloys. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:14409-14413. [PMID: 9997331 DOI: 10.1103/physrevb.43.14409] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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73
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Goswami PC, Vretou E, Bose SK. Host passage-dependent wheat germ agglutinin-binding proteins of Chlamydia trachomatis. FEMS Microbiol Lett 1991; 65:53-6. [PMID: 1874403 DOI: 10.1016/0378-1097(91)90470-u] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Wheat germ agglutinin (WGA)-binding proteins in the highly purified elementary bodies (EB) of Chlamydia trachomatis were detected by an ELISA-like assay of immobilized EB. Trypsin-sensitivity of the WGA-binding moieties was detected only in the chlamydiae grown in HeLa cells. A nonionic detergent, beta-octyl-D-glucopyranoside (OG), was used to extract proteins from the purified EB. Proteins in the extract were resolved by SDS-PAGE and probed with 125I-labelled WGA. Several proteins reacted with WGA in a specific manner. Some of these WGA-binding proteins in the EB of serovars L1 and E exhibited altered molecular mass after adaptation in the two alternate hosts, HeLa and McCoy cells. These results suggest that WGA-binding proteins exist in chlamydiae.
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74
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Joseph TD, Bose SK. A heat-labile protein of Chlamydia trachomatis binds to HeLa cells and inhibits the adherence of chlamydiae. Proc Natl Acad Sci U S A 1991; 88:4054-8. [PMID: 2023955 PMCID: PMC51592 DOI: 10.1073/pnas.88.9.4054] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
From highly purified elementary bodies (EBs) of Chlamydia trachomatis, we have identified a protein of 38 kDa that selectively binds to monolayer cultures of HeLa cells. This protein, which we have named the chlamydial cytadhesin (CCA), is present on the surface of the EBs of three C. trachomatis serovars (B, E, and L1) that were examined. Localization of the CCA at the surface was confirmed by its ability to be labeled when viable EBs were iodinated and by its absence in preparations from trypsin-treated EBs. Viable EBs, but not heated or trypsin-treated EBs, inhibited the binding of the CCA to HeLa cells, indicating competition for a common receptor on the host cell membrane. A dose-dependent inhibition of adherence of radioactive EBs to HeLa cells was effected by extracts containing the CCA. This inhibition occurred even with extracts prepared from the EB of heterologous serovars. However, no inhibition could be demonstrated with extracts prepared from heat-treated EBs. Heat treatment of the extract resulted in the loss of ability of the CCA to bind to the host cells. HeLa cells preincubated with CCA-containing chlamydial extract showed reduced ability to bind labeled EBs and to develop cytoplasmic inclusions after infection. This protective activity was lost after exposure of the extract to heat. These findings indicate that the CCA is a thermolabile surface-exposed chlamydial adhesin; it may be useful in the development of vaccines for diseases caused by the pathogenic bacterium.
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Bose SK, Dutta-Roy B. Geometry of quantum evolution and the coherent state. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 43:3217-3220. [PMID: 9905402 DOI: 10.1103/physreva.43.3217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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76
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Kudrnovsk J, Bose SK, Andersen OK. Comparative study of the electronic structure of ordered, partially ordered, and disordered phases of the Cu3Au alloy. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:4613-4621. [PMID: 9997829 DOI: 10.1103/physrevb.43.4613] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Hamed F, Razavi FS, Zaleski H, Bose SK. Pressure dependence of spin fluctuations in metallic glasses Ni25Zr75 and Fe100-xZrx (x=75,80). PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:3649-3651. [PMID: 9997683 DOI: 10.1103/physrevb.43.3649] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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78
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Omar BA, Hanson AK, Bose SK, McCord JM. Ischemic preconditioning is not mediated by free radicals in the isolated rabbit heart. Free Radic Biol Med 1991; 11:517-20. [PMID: 1663063 DOI: 10.1016/0891-5849(91)90064-a] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Preconditioning has been implicated to involve a free radical mechanism in the in vivo infarct size model. We have demonstrated preconditioning in the isolated rabbit heart and studied the effect of Mn-superoxide dismutase (SOD) on preconditioning. Buffer perfused control hearts (C) were subjected to 1-h global ischemia followed by 1-h reperfusion, and the percent recovery of developed tension (%DT; relative to preischemic) was measured via a left ventricular balloon connected to a polygraph recorder. The coronary effluent was assayed for lactate dehydrogenase release (LDH; IU/kg BW). Preconditioned hearts (P) received a single episode of 5-min ischemia and 5-min reperfusion before 1 h of ischemia and reperfusion. SOD treated hearts received SOD at 5 mg/L in the buffers at all times. The results show that while SOD attenuated enzyme release and functional loss in control hearts, it had no effect on preconditioned hearts. Therefore, preconditioning is unlikely to be mediated by superoxide anion in the isolated rabbit heart.
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Bose SK, Kudrnovsk J, Razavi FS, Andersen OK. Pressure dependence of electronic densities of states and superconducting transition temperatures in NiZr glasses. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:110-118. [PMID: 9996196 DOI: 10.1103/physrevb.43.110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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80
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Goswami PC, Vretou E, Bose SK. Extensive heterogeneity of the protein composition of Chlamydia trachomatis following serial passage in two different cell lines. JOURNAL OF GENERAL MICROBIOLOGY 1990; 136:1623-9. [PMID: 2262794 DOI: 10.1099/00221287-136-8-1623] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
To determine if the host-modulated adherence characteristics of the intracellular bacterial pathogen Chlamydia trachomatis were due to the acquisition of altered surface-exposed proteins, highly purified chlamydiae grown in two different host cells were analysed. Two serovars, L1 and E, were grown for multiple passages in both HeLa and McCoy host cells. Numerous protein differences in the chlamydial elementary bodies (EB) of each serovar grown in the two different hosts were detected by two-dimensional (2-D) gel electrophoresis and fluorography of radioactively labelled proteins. At least four to six serial passages in the alternative host were necessary before the changes were apparent. Iodination of suspensions of purified chlamydiae and 2-D electrophoresis revealed several surface proteins that were determined by the host cells in which the bacteria had replicated. These iodinated chlamydial proteins were removed by treatment of the iodinated EB with trypsin, indicating their location at the bacterial surface. Two of the major constituents of the outer-membrane complex, the cysteine- and methionine-rich 60 kDa and 40 kDa proteins, remained unchanged in both molecular mass and charge during the host adaptation. Several chlamydial proteins capable of binding iodinated host membrane preparations also exhibited host-dependent alterations. Immunoblotting experiments with a rabbit and a human polyclonal sera indicated that distinct host-specified chlamydial proteins were reactive with the two sera.
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81
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Bose SK, Kudrnovsky J, Mazin II, Andersen OK. Effect of disorder on the electronic structure of palladium. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:7988-7998. [PMID: 9993117 DOI: 10.1103/physrevb.41.7988] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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82
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Vretou E, Goswami PC, Bose SK. Adherence of multiple serovars of Chlamydia trachomatis to a common receptor on HeLa and McCoy cells is mediated by thermolabile protein(s). JOURNAL OF GENERAL MICROBIOLOGY 1989; 135:3229-37. [PMID: 2636258 DOI: 10.1099/00221287-135-12-3229] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Several aspects of the adherence of purified elementary bodies (EB) of Chlamydia trachomatis to HeLa and to McCoy cells were examined using different techniques, including an ELISA. Serovar-specific, biotinylated monoclonal antibodies were used to detect cell-bound chlamydiae. In addition, purified chlamydiae were biotinylated and their adherence properties were studied. The assays were done at 4 degrees C to exclude the energy-dependent internalization of the cell-bound EB and host-cell membrane recycling that occur at 37 degrees C. Saturation kinetics were routinely observed at 4 degrees C, and the rate of adherence remained linear for approximately 60 min. Lineweaver-Burk analysis of the kinetics data showed that adherence of any one serovar was competitively inhibited by other serovars of C. trachomatis. This competition for the same receptor on the two alternative hosts, HeLa and McCoy, was also seen when the adherence assays were done at 37 degrees C in the presence of sodium azide, an energy poison that inhibits endocytosis of cell-bound chlamydiae. Chlamydiae exposed to 56 degrees C for 5 min, or treated with low doses of trypsin, failed to exhibit competitive inhibition, having suffered considerable loss of the ability to adhere to host-cells. These data suggest that heat- and trypsin-labile chlamydial moieties participate in the adherence reaction, and that oculo-genital serovars of C. trachomatis, including that of lymphogranuloma venereum, attach to the same receptor on the host-cell membrane.
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83
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Bhaduri S, Bandyopadhyay S, Bose SK. Repression of sporulation: isolation and characterization of repression-resistant mutants of Bacillus subtilis. THE JOURNAL OF APPLIED BACTERIOLOGY 1989; 67:497-504. [PMID: 2512275 DOI: 10.1111/j.1365-2672.1989.tb02521.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The sporulation of Bacillus subtilis B34 was repressed by 24 h if glutamine or ammonium chloride but not glutamate was added at late log phase (70 h) when glucose and glutamate were nearly exhausted. Glutamine-resistant mutants were isolated by selective heat treatment during the delay period induced by glutamine. Glutamine-resistant mutants showed cross resistance not only against ammonium chloride but also against glucose just as glucose-resistant mutants showed resistance against nitrogenous catabolites.
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Sarkar AK, Chakraborti A, Saha UK, Bose SK, Sengupta D. Effects of aspirin and paracetamol on ATPases of human fetal brain: an in vitro study. INDIAN JOURNAL OF EXPERIMENTAL BIOLOGY 1989; 27:802-4. [PMID: 2561117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In vitro effects of aspirin and paracetamol at the doses 200, 400, 600, 800 nmole/mg protein on ATPases activity were studied in the cerebrum and cerebellum of human fetus covering the age range from 10 weeks to 32 weeks of gestation. Both aspirin and paracetamol inhibit Na+K+ ATPase and Mg2+ ATPase in a dose dependent manner. The inhibition of Na+K+ ATPase and Mg2+ ATPase activity which may affect the release and uptake of biogenic amines in CNS, hinders the maturation of human fetal brain.
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Basu S, Bose SK, Bose SK. Characterization of versilin-sensitive sites in self-sensitive producer and sensitive non-producer or unrelated organism. THE JOURNAL OF APPLIED BACTERIOLOGY 1989; 67:191-200. [PMID: 2808186 DOI: 10.1111/j.1365-2672.1989.tb03395.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Studies on self-sensitivity of producer mutant vs. sensitivity of non-producer parent and unrelated organism showed that versilin inhibited spore germination and sporulation in the self-sensitive producer mutant, non-producer parent Aspergillus versicolor N5 and the unrelated sensitive Trichophyton rubrum. Sporulation appeared to be more sensitive than spore germination. The inhibition of in vivo synthesis of protein was very marked, but inhibition of RNA and DNA was slight and moderate, respectively. Thus versilin was not specific in its action, but the principal sensitive site was protein synthesis, as further suggested by inhibition of polyU-directed in vitro synthesis of polyphenylalanine. The activation of leucine was unaffected, but the formation of leucyl-tRNA was severely inhibited in all three strains. The differences in sensitivities between the strains were the same, whether as whole cells or as cell-free extracts. Thus the nature of the sensitive site appeared to be identical in the self-sensitive producer and sensitive non-producer or unrelated organism.
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86
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87
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Winer K, Bose SK. Effects of topological distortion on the properties of silicon. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 38:12683-12686. [PMID: 9946222 DOI: 10.1103/physrevb.38.12683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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88
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Bose SK, McGlinn WD. Effect of finite mass on gravitational transit time. Int J Clin Exp Med 1988; 38:2335-2337. [PMID: 9959394 DOI: 10.1103/physrevd.38.2335] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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89
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Bose SK, Jaswal SS, Andersen OK, Hafner J. Linear-muffin-tin-orbital (LMTO) supercell and LMTO recursion calculations for the electronic structure of metallic glasses: Ca7Al. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 37:9955-9963. [PMID: 9944420 DOI: 10.1103/physrevb.37.9955] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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90
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Majumder S, Mukhopadhyay NK, Ghosh SK, Bose SK. Genetic analysis fo the mycobacillin biosynthetic pathway in Bacillus subtilis B3. JOURNAL OF GENERAL MICROBIOLOGY 1988; 134:1147-53. [PMID: 3143803 DOI: 10.1099/00221287-134-5-1147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Twelve mycobacillin-negative (My-) mutants of Bacillus subtilis B3 were isolated from an auxotrophically tagged mycobacillin producer organism. In whole-cell fermentations of some of these My- mutants a penta- and a nonapeptide accumulated; these peptides were also obtained in a cell-free system in which a new tripeptide was also detected. The amino acid composition, N- and C-terminal residues and amino acid sequence of these peptides agreed with those of equivalent segments of the mycobacillin molecule. The mycobacillin-synthesizing enzyme can be divided into three fractions that catalyse different steps in biosynthesis, and the defective enzyme fractions in the various mutant strains were identified by reconstitution experiments in vitro. The defects were further pin-pointed in mutant enzyme fractions by an ATP in equilibrium Pi exchange reaction and also by cell-free synthesis involving the use of membrane-bound enzyme. The defects so identified indicated the formation of tri-, penta- and nonapeptides as intermediates in the mycobacillin biosynthetic pathway.
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91
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Bose SK, Winer K, Andersen OK. Electronic properties of a realistic model of amorphous silicon. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 37:6262-6277. [PMID: 9943864 DOI: 10.1103/physrevb.37.6262] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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92
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Mandal K, Kono M, Bose SK, Thomson J, Chakrabarti B. Structure and stability of gamma-crystallins--IV. Aggregation and structural destabilization in photosensitized reactions. Photochem Photobiol 1988; 47:583-91. [PMID: 3406121 DOI: 10.1111/j.1751-1097.1988.tb08848.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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93
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Das SK, Mukherjee S, Majumdar S, Basu S, Bose SK. Physico-chemical interaction of mycobacillin with Aspergillus niger protoplast membrane, the site of its action. J Antibiot (Tokyo) 1987; 40:1036-43. [PMID: 3624066 DOI: 10.7164/antibiotics.40.1036] [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: 01/06/2023]
Abstract
Mycobacillin partially quenched the strong fluorescence when 1-anilino naphthalene 8-sulfonate (ANS) was added to protoplast or plasma membrane but is without any effect on weak fluorescence when added to cell-free extract. There are two classes of ANS binding sites on protoplast or plasma membrane of which one class is sensitive to mycobacillin, being competitively abolished by it. Mycobacillin also non-competitively inhibits the binding of pyrene, a lipid specific probe. Thus it follows from the inhibition by mycobacillin of ANS or pyrene binding to protoplast or plasma membrane that the site of action of the antibiotic is located in the plasma membrane. Interaction between mycobacillin and the plasma membrane is physico-chemical in nature.
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Basu S, Majumdar S, Das SK, Bose SK. Mutual and self-sensitivity among antibiotically active mutant derivatives from the inactive degenerate Aspergillus versicolor N5. THE JOURNAL OF APPLIED BACTERIOLOGY 1987; 63:53-61. [PMID: 3654401 DOI: 10.1111/j.1365-2672.1987.tb02417.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Antibiotically active producer mutants derived from the spontaneous degenerate parent Aspergillus versicolor N5 possessed not only mutual but also self-sensitive activity. The producer mutants, like the inactive parent, were only 3.5-fold less sensitive than the most sensitive unrelated organism, Trichophyton rubrum. The germination of spores is generally more sensitive than growth of vegetative cells. The antifungal spectrum of these mutual and self-sensitive mutants was fairly wide, unlike the host range specificity of bacteriocinogenic strains acting on organisms closely related to the producers. The self and mutual growth inhibitory principle was finally identified as the antibiotics mycoversilin and versilin in the case of producer mutants (N5)17 and N5T10(7), respectively, or Vx, an antibiotic of unknown molecular species, in the case of another producer mutant N5T10(8). Thus self-sensitivity, instead of self-resistance, of these antibiotically active mutant derivatives is a unique property among filamentous fungi in having simultaneously expressed two loci of contradictory functions, one for synthesis of, and the other for sensitivity towards, the same or related antibiotics.
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Basu S, Das SK, Majumdar S, Bose SK. Multiplicity of antibiotic production in Aspergillus versicolor N5 under mutagenesis: versilin a new antifungal antibiotic. INDIAN JOURNAL OF EXPERIMENTAL BIOLOGY 1987; 25:207-8. [PMID: 3666820] [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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96
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Mandal K, Bose SK, Chakrabarti B, Siezen RJ. Structure and stability of gamma-crystallins. II. Differences in microenvironments and spatial arrangements of cysteine residues. BIOCHIMICA ET BIOPHYSICA ACTA 1987; 911:277-84. [PMID: 3814605 DOI: 10.1016/0167-4838(87)90068-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The gamma-crystallin fractions II, III and IV from calf eye lens were treated with the thiol-specific fluorescent probe 2-(4'-maleimidylanilino)naphthalene-6-sulfonate (MIANS), in order to determine the reactivity of the seven (gamma-II) or six (gamma-III, gamma-IV) cysteine residues. Two classes of reactive cysteines were distinguished by variations in fluorescence intensity with increasing molar excess of the probe, and approximately three cysteines were nonreactive in each gamma-crystallin. From the position of the emission maximum, it is apparent that MIANS-labeled cysteines of gamma-IV are in the least hydrophobic environment. Fluorescence energy transfer was observed from tryptophan to MIANS-labeled cysteines in both gamma-II and gamma-III crystallins, with efficiencies of 86% and 89%, respectively, but not in gamma-IV crystallin. We suggest that the spatial arrangements and microenvironments of cysteine residues of gamma-crystallins are sufficiently different from each other to account for the variations in fluorescence characteristics of the MIANS-labeled proteins and the lack of energy transfer in gamma-IV crystallins.
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Basu S, Das SK, Majumdar S, Bhattacharyya D, Bose SK. Role of selective pressure by screening organisms in the development of producer mutant isolates of different antibiotic markers. THE JOURNAL OF APPLIED BACTERIOLOGY 1986; 61:481-9. [PMID: 3558163 DOI: 10.1111/j.1365-2672.1986.tb01720.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The phenotypes of producer mutant isolates when obtained after mutagenesis of the spontaneous degenerate Aspergillus versicolor N5 by screening on Trichophyton rubrum and those on A. niger G3Br were found to be markedly different. In respect of phenotypic character anti-T. rubrum producer mutant isolates resembled the parental type more closely (which is specifically active against T. rubrum and generally against dermatophytes) than anti-A. niger mutant isolates. This clearly indicates not only the role of selective pressure of the screening organism in the development of a given producer mutant isolate but also shows the possibility of recovery of a producer type of the lost antibiotic marker.
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Ghosh SK, Majumder S, Mukhopadhyay NK, Bose SK. Role of ATP and enzyme-bound nascent peptides in the control of elongation for mycobacillin synthesis. Biochem J 1986; 240:265-8. [PMID: 3103608 PMCID: PMC1147403 DOI: 10.1042/bj2400265] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The enzyme fraction A, a constituent of the three-fraction (A, B and C) enzyme complex mycobacillin synthetase, elongated tri- and tetra-peptides, under enzyme-bound conditions, to tetra- and penta-peptides respectively in the presence of the 'next' amino acid (in the mycobacillin sequence). The enzyme fraction B synthesized hexapeptide from free pentapeptide and the next amino acid, but synthesized heptapeptide from hexapeptide only under enzyme-bound conditions in the presence of the next amino acid. Similarly, the enzyme fraction C synthesized decapeptide from free nonapeptide in the presence of the next amino acid, but undecapeptide only from enzyme-bound decapeptide in the presence of the next amino acid during the elongation process. The Km values for the initiating reactions for each of the three enzyme fractions were 6-7-fold lower than those for the succeeding reactions catalysed by each of the enzyme fractions. The specificity of the initiation and elongation is discussed in the light of these findings.
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99
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Das SK, Basu S, Majumdar S, Bose SK. Selective action of mycobacillin on the uptake of releasable cell materials by Aspergillus niger. Biochem J 1986; 239:317-23. [PMID: 3101663 PMCID: PMC1147283 DOI: 10.1042/bj2390317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The uptake of normally releasable (i.e. releasable in the absence of the antibiotic) cell constituents (namely lysine, proline, ATP, Pi, Na+, K+ and Ca2+) by sensitive cells of Aspergillus niger that occurs in the absence of mycobacillin is gradually enhanced with increase in concentration of the antibiotic until the uptake attains the maximum. With still higher concentrations the uptake decreases until it becomes the same as in the control without mycobacillin. Uptake follows saturation kinetics both in the absence and in the presence of the antibiotic. Mycobacillin significantly increases Vmax. for uptake with any effect on Km, Mycobacillin has no action on the uptake of non-releasable materials.
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100
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Bose SK, Goswami PC. Enhancement of adherence and growth of Chlamydia trachomatis by estrogen treatment of HeLa cells. Infect Immun 1986; 53:646-50. [PMID: 3744558 PMCID: PMC260842 DOI: 10.1128/iai.53.3.646-650.1986] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Treatment of HeLa 229 cultures with 17-beta-estradiol or with diethylstilbestrol, a synthetic estrogen analog, prior to infection with Chlamydia trachomatis UW31 (serovar K) or LGV440 (serovar L1) led to a 50 to 60% enhancement of chlamydial inclusion formation. After infection, the presence of estrogen was required for the enhancement. The optimal concentration of estrogen required was 10(-10) M. At least 18 h of preinfection treatment plus 12 h of postinfection treatment was necessary. The adherence of purified radioactive elementary bodies of C. trachomatis to estrogen-treated HeLa cells was stimulated in an estrogen dose- and exposure-dependent manner. The requirements for both pre- and postinfection exposure to the hormone suggest that alterations in the cell membrane as well as in the metabolic capacity of the host cells is required for intracellular chlamydial development. Cycloheximide did not prevent estrogen enhancement of chlamydial adherence or subsequent intracellular development of inclusions.
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