IYER KRISHNAN

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We have identified four overlapping genomic DNA clones coding for human class 1 heparin-binding growth factor (HBGF-1), also known as acidic fibroblast growth factor, by screening genomic DNA libraries with an HBGF-1 cDNA probe. The exon-intron structure of the HBGF-1 gene was determined by Southern hybridization and nucleotide sequence analysis. The(More)
Interferon-treated cells show an increase in two double-stranded RNA (dsRNA)-dependent enzymatic activities involving an oligoadenylate polymerase and a protein kinase (ref. 1 and refs therein). The polymerase converts ATP into a series of oligonucleotides characterized by 2'5'-phosphodiester bonds, designated 2'5'-oligo(A) or 2-5A (ref. 1). These(More)
An enzymatic activity that synthesizes (2'-5')-oligo(A) from ATP is induced in animal cells treated with interferon. This activity, designated (2'-5')A polymerase, is also elevated in human lymphoblastoid Daudi and Raji cells treated with hydrocortisone. The polymerase activity increases significantly after 24 hr of treatment and declines when(More)
Glutamine synthetase from Clostridium pasteurianum grown on molasses as the sole carbon source and ammonium chloride as the nitrogen source has been purified to homogeneity (45-fold) with 32% recovery. The procedure involves ammonium sulfate precipitation and chromatography on a combined Sepharose 4B/DEAE-Sephadex A-50 column. The purified enzyme being very(More)
Clostridium pasteurianum possesses a high level of glutamate synthase (EC 1.4.1.14) activity and cell yield when grown on 4 mM ammonium chloride and molasses as the sole nitrogen and carbon sources, respectively. The enzyme activity is stabilized by addition of alpha-ketoglutarate, EDTA, and 2-mercaptoethanol. Ammonium sulfate precipitation and single-step(More)
Site directed mutagenesis/charged-to-alanine scanning mutagenesis of the amino terminal portion of human ERK2 (from amino acids 1 to 150) purified as a glutathione-S-transferase fusion protein (GST-ERK2) from E. coli has been done to determine regions/amino acids important for activation by rabbit skeletal muscle MAP kinase kinase (rMEK) and kinase activity(More)
  • MULLA SAIRA, MUKHOPADHYAY RAJENDRA NATH, SUHAS RAMKRISHANA, BHURE SUDESH, IYER KRISHNAN
  • 2014
Objectives: The objective of this study is to synthesise and isolate in process impurity of Efavirenz in the presence of Tetrahydrofuran solvent. Method: In the process related impurity ranging from 0.05% to 0.2% in Efavirenz were detected by a gradient reversed phase high performance liquid chromatography (RP-HPLC).This impurity was isolated from the crude(More)
(2'-5')Oligoadenylic acid [(2'-5')An] polymerase activity was measured in extracts of human lymphoblastoid cells of the Namalva line cultured under different conditions. Exponentially growing cells had a relatively low polymerase activity level, whereas cells grown to limit density showed elevated levels. When fresh medium was added to growth-arrested(More)
Preliminary chemical modification studies indicated the presence of tyrosine, carboxyl, arginine, histidine and the absence of serine and sulfhydryl residues at or near the active site of Clostridium pasteurianum glutamine synthetase. The conditions for tyrosine modification with tetranitromethane were optimized. The inactivation kinetics follow(More)