226
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Agarwal SK, Mitra MK, Misra R, Sethi PP, Murthy PK, Chatterjee RK. Filarial chyluria: an immunological and renal function study. THE JOURNAL OF THE ASSOCIATION OF PHYSICIANS OF INDIA 1987; 35:425-7. [PMID: 3308835] [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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227
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Misra R, Pandey RC, Hilton BD, Roller PP, Silverton JV. Structure of fredericamycin A, an antitumor antibiotic of a novel skeletal type; spectroscopic and mass spectral characterization. J Antibiot (Tokyo) 1987; 40:786-802. [PMID: 3112081 DOI: 10.7164/antibiotics.40.786] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
IR, UV-visible spectroscopy, circular dichroism, 1H and 13C NMR studies, high resolution electron impact, field desorption, and fast atom bombardment mass spectral studies are reported for fredericamycin A (NSC-305263), a novel antitumor antibiotic of acid-base indicator type produced by Streptomyces griseus (FCRC-48). The spectral data are correlated with the structure obtained by X-ray crystallography as (E,E)-6',7'-dihydro-4,9,9'-trihydroxy-6-methoxy-3'-(1,3-pentadienyl++ +)-spiro- [2H-benz[f]indene-2,8'-[8H]-cyclopent-[g]-isoquinoline]-1,1', 3,5,8(2'H)-pentone. The novel spiro ring antibiotic exhibits unusual 1H and 13C NMR spectroscopic and chemical behavior, not previously observed in other antibiotic structures.
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228
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Hilton BD, Misra R, Zweier JL. Magnetic resonance studies of fredericamycin A: evidence for O2-dependent free-radical formation. Biochemistry 1986; 25:5533-9. [PMID: 3022794 DOI: 10.1021/bi00367a028] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Fredericamycin A, a newly described potent antitumor antibiotic, exhibits unusual spectroscopic and physical properties. The drug shows a striking color change from red to blue on exposure to O2, with the appearance of an optical absorption band at 675 nm; on addition of acid these changes are readily reversed. 1H and 13C NMR spectra of fredericamycin A show that the resonances from the quininoid half of the molecule disappear after exposure to O2 but reappear on acidification in parallel with the observed optical spectral shift. These unusual NMR data are explained by electron spin resonance studies which demonstrate that fredericamycin A spontaneously forms an oxidized free radical with electron transfer to O2. The observed hyperfine structure of this radical is consistent with one-electron oxidation of the quininoid group. After fredericamycin A is exposed to O2, an EPR signal is observed with axial symmetry with temperature and power saturation behavior suggestive of .O2-. Spin-trapping EPR studies demonstrate that the drug reduces O2 to .O2- and H2O2 to .OH. This spontaneous mechanism of O2 reduction with the generation of oxidized drug free radicals and reduced oxygen free radicals is unprecedented among anticancer drugs, suggesting that fredericamycin A could be the forerunner of a new class of anticancer drug.
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229
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Malaviya AN, Misra R, Banerjee S, Kumar A, Tiwari SC, Bhuyan UN, Malhotra KK, Guleria JS. Systemic lupus erythematosus in North Indian Asians. A prospective analysis of clinical and immunological features. Rheumatol Int 1986; 6:97-101. [PMID: 3489275 DOI: 10.1007/bf00270344] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
One hundred and one patients with systemic lupus erythematosus (SLE) from North Indian stock are presented. The clinical manifestations, laboratory parameters, causes of death, and survival are compared and contrasted with the other major reported series. SLE of North Indian Asians has several features comparable to those reported from the West, but other features are more similar to the SLE seen in Mongoloid races.
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230
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Singh R, Chandra A, Bhatia KB, Misra R. Short term open study of propanol in the peptic ulcer/hyperacidity syndrome. TROPICAL GASTROENTEROLOGY : OFFICIAL JOURNAL OF THE DIGESTIVE DISEASES FOUNDATION 1986; 7:126-8. [PMID: 3787720] [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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231
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Dev V, Malaviya AN, Misra R, Verma K, Banerjee S, Mehra NK, Kumar A. Comparative study of immunochemical and cytopathological parameters in rheumatoid arthritis and seronegative spondarthritis syndrome. THE JOURNAL OF THE ASSOCIATION OF PHYSICIANS OF INDIA 1986; 34:253-5. [PMID: 3759819] [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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232
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Kumar A, Bhat A, Bhadoria DP, Misra R, Malaviya AN. Adult Still's disease-a cause of pyrexia of unknown origin. THE JOURNAL OF THE ASSOCIATION OF PHYSICIANS OF INDIA 1986; 34:270-2. [PMID: 3759824] [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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233
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Kumar A, Malaviya AN, Bhat A, Misra R, Banerjee S, Sindhwani R, Tiwari SC, Bhuyan UN, Guleria JS. Clinicopathological profile of vasculitides in India. THE JOURNAL OF THE ASSOCIATION OF PHYSICIANS OF INDIA 1985; 33:694-8. [PMID: 4093380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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234
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Abstract
Eucaryotic extrachromosomal DNAs have been organized into four major classes: (1) Organelle DNAs, (2) plasmid DNAs, (3) amplified genes, and (4) intermediates and/or by-products of DNA transpositions and rearrangements. In this review some of the relatively well-characterized members of each class are described; it is suggested that many of them reflect the complexity and plasticity of eucaryotic genomes.
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235
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Misra R, Srivastava N, Misra UK. Evidence for colchicine binding protein in Mycobacterium smegmatis. INDIAN JOURNAL OF BIOCHEMISTRY & BIOPHYSICS 1985; 22:316-7. [PMID: 3833669] [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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236
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Kumar A, Bhat A, Misra R, Malaviya AN, Suri RK, Sohi AS. Multicentric reticulohistiocytosis mimicking rheumatoid arthritis. Clin Exp Rheumatol 1985; 3:360-1. [PMID: 4085168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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237
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Misra R, Reeves P. Intermediates in the synthesis of TolC protein include an incomplete peptide stalled at a rare Arg codon. EUROPEAN JOURNAL OF BIOCHEMISTRY 1985; 152:151-5. [PMID: 3899641 DOI: 10.1111/j.1432-1033.1985.tb09175.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
TolC is a minor outer membrane protein of Escherichia coli K 12 and is initially synthesized as a precursor. A distinct intermediate polypeptide of Mr about 46 000 was consistently observed at the initial stages of biosynthesis. The further elongation of this peptide can be blocked by chloramphenicol. We have investigated the cause of the temporary accumulation of the 46 000-Mr intermediate and we postulate that the presence of a rare codon AGA (Arg) at codon 402 of the tolC mRNA halts translating ribosomes owing to a limiting amount of the tRNAArg (AGA) species in the cell. The translation of tolC mRNA can be increased by providing T4 tRNAArg (AGA), encoded on a plasmid.
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238
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Misra R, Tritch HR, Pandey RC. Defucogilvocarcin V, a new antibiotic from Streptomyces arenae 2064: isolation, characterization, partial synthesis and biological activity. J Antibiot (Tokyo) 1985; 38:1280-3. [PMID: 3917241 DOI: 10.7164/antibiotics.38.1280] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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239
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Paulson KE, Deka N, Schmid CW, Misra R, Schindler CW, Rush MG, Kadyk L, Leinwand L. A transposon-like element in human DNA. Nature 1985; 316:359-61. [PMID: 2862587 DOI: 10.1038/316359a0] [Citation(s) in RCA: 110] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Mobile genetic elements have been reported in prokaryotes, plants, yeast and Drosophila. The only transposon-like sequences reported for mammalian organisms are closely related to retroviruses, although undoubtedly other transposon families exist within the mammalian genome. Although mobile genetic elements can only be identified as such if their mobility can be demonstrated in existing populations, transposon and transposon-like elements share several common biochemical and structural features. Here we demonstrate that a repetitive human sequence has many of the diagnostic features of transposable elements. This 2.3-kilobase (kb) transposon-like element contains two flanking long terminal repeat (LTR)-like 350-base pair (bp) repetitive sequences, each of which begins with the sequence 5' TG... and ends with ...CA 3'. The transposon-like element is bounded by 5-bp direct repeats. Discrete-length polyadenylated transcripts from HeLa cells are homologous to the transposon-like element. Members of this transposon-like family are found in extrachromosomal circular DNA molecules.
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240
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Byrne KM, Hilton BD, White RJ, Misra R, Pandey RC. Biosynthesis of fredericamycin A, a new antitumor antibiotic. Biochemistry 1985; 24:478-86. [PMID: 3919762 DOI: 10.1021/bi00323a035] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Fredericamycin A (FM A), produced by a strain of Streptomyces griseus, represents a new structural class of antitumor antibiotics containing a spiro ring system. Studies on the producer organism showed that glucose in the fermentation medium is not utilized until late in the growth stage, just prior to synthesis of FM A. [14C]Glucose tracer experiments demonstrated that glucose is incorporated into FM A by catabolism to acetate. Biosynthetic enrichment of FM A with single- and double-labeled [13C]acetate showed that the entire carbon skeleton of the spiro ring system is derived from acetate. L-Methionine was shown to provide the only nonskeletal carbon in FM A, the methoxy carbon at position C-6. The direction of the polyketide chain and the position of the carbon lost during biosynthesis were established by using stable isotope experiments. A general model for FM A biosynthesis is proposed, and a possible scheme for the formation of the spiro carbon center is presented.
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241
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Abstract
The previously described Stc- (suppressor of TolC) mutation modifies the phenotype of tolC mutants from OmpF- to OmpF+. Restriction mapping of chromosomal DNA from Stc+ and Stc- strains was performed to investigate the nature of the mutation which was shown to be a deletion, upstream of the ompC gene. DNA from the region of the deletion was cloned into pUC18 and a 650-bp PstI-EcoRI fragment was sequenced. The deletion started 49 bp upstream of the AUG start codon of the ompC gene, thus removing part of the ompC promoter and the whole of the micF gene. We suggest that the deletion of micF gives rise to the Stc- phenotype since the effect of micF expression is assumed to reduce ompF expression, and the Stc- phenotype involves increase in ompF expression.
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242
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Misra R, Das JP, Tripathy BB, Samal KC, Bidyadhar S. Studies on noncoronary cardiac complications of diabetes mellitus. THE JOURNAL OF THE ASSOCIATION OF PHYSICIANS OF INDIA 1984; 32:569-74. [PMID: 6501194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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243
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Schenk K, Misra R, Vassos S, Wen W. A New Method for the Evaluation of Expected Energy Generation and Loss of Load Probability. ACTA ACUST UNITED AC 1984. [DOI: 10.1109/tpas.1984.318228] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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244
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DiGiovanni L, Haynes SR, Misra R, Jelinek WR. Kpn I family of long-dispersed repeated DNA sequences of man: evidence for entry into genomic DNA of DNA copies of poly(A)-terminated Kpn I RNAs. Proc Natl Acad Sci U S A 1983; 80:6533-7. [PMID: 6195659 PMCID: PMC390387 DOI: 10.1073/pnas.80.21.6533] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
We have isolated eight cDNA clones complementary to the human Kpn I repeat and determined the base sequence of three. We have also determined a portion of the base sequences of three human Kpn I family members. The three cDNA sequences are extensively homologous with the 3' ends of the three genomic Kpn I family members and with a simian Kpn I family member recently described [Thayer, R. E. & Singer, M. F. (1983) Mol. Cell. Biol. 6, 967-973]. The genomic repeats terminate in regions of sequence rich in dAMP residues close to sequences at the 3' ends of the cDNA clones; a precise 3'-terminal nucleotide cannot be distinguished. These structural features are consistent with the dispersal of at least some Kpn I family members by entry into genomic DNA of copies of Kpn I RNA transcripts. Each cDNA contains a long poly(dAMP) homopolymer at its 3' end and either one or two A-A-T-A-A-A polyadenylylation signal sequences upstream from it, suggesting that Kpn I family members may be transcribed by RNA polymerase II.
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245
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Hackett J, Misra R, Reeves P. The TolC protein of Escherichia coli K12 is synthesised in a precursor form. FEBS Lett 1983; 156:307-10. [PMID: 6303857 DOI: 10.1016/0014-5793(83)80518-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We examined the biosynthesis of the TolC protein of Escherichia coli K12 in a pulse-chase experiment, followed by immunoprecipitation with anti-TolC antibody and SDS-PAGE of the immunoprecipitate. This showed that TolC protein was originally synthesised in a precursor form (Mr 54 500) which could be chased into the mature form (Mr 52 000). DNA sequencing of a portion of the cloned tolC gene showed that the N-terminus of the mature rotein was preceded by a typical signal sequence of 22 residues (Mr 2542). The initiator Met was preceded by a Shine-Dalgarno sequence, with the correct spacing.
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246
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Shukla JS, Saxena S, Misra R. Synthesis and neuropharmacological studies of some newer substituted benzimidazolyl thiocarbamides. INDIAN JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY 1982; 26:176-8. [PMID: 7141623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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247
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Misra R, Misra NP. Myotonia dystrophica (a case report). THE JOURNAL OF THE ASSOCIATION OF PHYSICIANS OF INDIA 1981; 29:569-72. [PMID: 7328082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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248
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Puri VK, Misra R, Hasan M. "Left ventricular function in mitral stenosis by systolic time intervals". Indian Heart J 1980; 32:361-4. [PMID: 7228085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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249
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Kiceniuk JW, Fletcher GL, Misra R. Physiological and morphological changes in a cold torpid marine fish upon acute exposure to petroleum. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 1980; 24:313-319. [PMID: 7362913 DOI: 10.1007/bf01608115] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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250
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Misra R, Bhambal SA, Misra NP, Misra SM. Serum copper, ceruloplasmin & iron in ischaemic heart disease. Indian Heart J 1978; 30:339-44. [PMID: 744614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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