Substituted NDP-MSH peptides paired with mutant melanocortin-4 receptors demonstrate the role of transmembrane 6 in receptor activation.

abstract：:Four different temperature-sensitive M protein mutants (tsM) of vesicular stomatitis virus (VSV) were characterized with regard to the association of the mutated M protein either with nucleocapsids or with membranes in the intact virions. Virions were labeled with the photoreactive hydrophobic probe [125I]iodonaphthyl...

journal_title：Biochemistry

authors： Mancarella DA,Lenard J

更新日期：1981-11-24 00:00:00

abstract：:Raman difference spectroscopy is used to probe the properties of a 36-nt RNA molecule, "D5", which lies at the heart of the catalytic apparatus in group II introns. For D5 that has all of its adenine residues labeled with (13)C and (15)N and utilizing Raman difference spectroscopy, we identify the conformationally sen...

journal_title：Biochemistry

authors： Chen Y,Eldho NV,Dayie TK,Carey PR

更新日期：2010-04-27 00:00:00

abstract：:Picosecond absorption spectroscopy has been used to investigate energy-transfer dynamics within the LH1 and LH2 light-harvesting complexes of three mutants of Rhodobacter sphaeroides. We demonstrate that both complexes are inhomogeneous; each contains a specialized pigment pool which absorbs maximally at a longer wave...

journal_title：Biochemistry

authors： Hunter CN,Bergström H,van Grondelle R,Sundström V

更新日期：1990-04-03 00:00:00

abstract：:Basic peptides from the carboxy terminus of the human immunodeficiency virus type 1 (HIV-1) Tat protein bind to the stem-loop region of TAR RNA, spanning a trinucleotide bulge, with high affinity and moderate specificity. Previous studies have demonstrated that TAR RNA contains a specific arginine binding pocket. A se...

journal_title：Biochemistry

authors： Long KS,Crothers DM

更新日期：1995-07-11 00:00:00

abstract：:Periodate-oxidized ATP (o-ATP) was prepared as an affinity label of nucleotide binding sites on the chloroform-released ox heart mitochondrial ATPase. In the presence of MgSO4, o-ATP is a substrate for the ATPase. It can act as a reversible, competitive inhibitor of ATPase activity and can also induce an irreversible ...

journal_title：Biochemistry

authors： Lowe PN,Beechey RB

更新日期：1982-08-17 00:00:00

abstract：:Oligonucleotides labeled with hexachlorofluorescein (hex) have enabled the interaction of the restriction endonuclease EcoRV with DNA to be evaluated using fluorescence anisotropy. The sensitivity of hex allowed measurements at oligonucleotide concentrations as low as 1 nM, enabling K(D) values in the low nanomolar ra...

journal_title：Biochemistry

authors： Reid SL,Parry D,Liu HH,Connolly BA

更新日期：2001-02-27 00:00:00

abstract：:The ras oncogene products (H-Ras, K-Ras, and N-Ras) have been regarded as some of the most promising targets for anticancer drug discovery because their activating mutations are frequently found in human cancers. Nonetheless, molecular targeted therapy for them is currently unavailable. Here, we report the discovery o...

journal_title：Biochemistry

authors： Matsumoto S,Hiraga T,Hayashi Y,Yoshikawa Y,Tsuda C,Araki M,Neya M,Shima F,Kataoka T

更新日期：2018-09-11 00:00:00

abstract：:The product of yjeK in Escherichia coli is a homologue of lysine 2,3-aminomutase (LAM) from Clostridium subterminale SB4, and both enzymes catalyze the isomerization of (S)- but not (R)-alpha-lysine by radical mechanisms. The turnover number for LAM from E. coli is 5.0 min(-1), 0.1% of the value for clostridial LAM. T...

journal_title：Biochemistry

authors： Behshad E,Ruzicka FJ,Mansoorabadi SO,Chen D,Reed GH,Frey PA

更新日期：2006-10-24 00:00:00

abstract：:Design of a partially cysteine-depleted C98S/C239S/C377S/C468A cytochrome P450 3A4 mutant designated CYP3A4(C58,C64) allowed site-directed incorporation of thiol-reactive fluorescent probes into alpha-helix A. The site of modification was identified as Cys-64 with the help of CYP3A4(C58) and CYP3A4(C64), each bearing ...

journal_title：Biochemistry

authors： Tsalkova TN,Davydova NY,Halpert JR,Davydov DR

更新日期：2007-01-09 00:00:00

abstract：:The iron heme and its immediate environment can provide information that is pivotal to our understanding of the structural and mechanistic features that confer unusual properties to the heme peroxidases. X-ray absorption spectroscopy (XAS), which is ideally suited for the investigation of the local environment and ele...

journal_title：Biochemistry

authors： Sinclair R,Copeland B,Yamazaki I,Powers L

更新日期：1995-10-10 00:00:00

abstract：:The kinetics and mechanism of cleavage of DNA by the insulin-mimetic peroxo-vanadate NH4[VO(O2)2(phen)], pV, are described. In the presence of low energy UV radiation or biologically common reducing agents, pV decomposes into the monomer, dimer, and tetramer of vanadate and an uncharacterized compound of V4+ as shown ...

journal_title：Biochemistry

authors： Hiort C,Goodisman J,Dabrowiak JC

更新日期：1996-09-24 00:00:00

abstract：:The Type I homodimeric photosynthetic reaction center found in anaerobic gram-positive bacteria of the genus Heliobacteriaceae incorporates FA- and FB-like iron-sulfur clusters similar to those found in Photosystem I as terminal electron acceptors. We recently isolated the PshB protein that harbors the iron-sulfur clu...

journal_title：Biochemistry

authors： Heinnickel M,Shen G,Golbeck JH

更新日期：2007-03-06 00:00:00

abstract：:The luminescence properties (fluorescence and phosphorescence) of luliberin have been investigated at liquid-nitrogen temperature (77 K) in 50% ethylene glycolaqueous buffer at various pH's. Calculation of the energy-transfer efficiency between Trp and Tyr residues leads to an evaluation of the distance separating the...

journal_title：Biochemistry

authors： Marche P,Montenay-Garestier T,Fromageot P,Hélène C

更新日期：1976-12-28 00:00:00

abstract：:Reactivation of tetrameric porcine skeletal muscle lactic dehydrogenase after dissociation and extensive unfolding of the monomers by 6 M guanidine hydrochloride (Gdn . HCl) is characterized by sigmoidal kinetics, indicating a complex mechanism involving rate-limiting folding and association steps. For analysis of the...

journal_title：Biochemistry

authors： Zettlmeissl G,Rudolph R,Jaenicke R

更新日期：1982-08-17 00:00:00

abstract：:The tertiary structure of alpha1-acid glycoprotein (AGP) remains unresolved despite its novel function because AGP is a hard target in X-ray and NMR analyses. To elucidate the membrane-induced conformational change of AGP, the vacuum-ultraviolet circular dichroism (VUVCD) spectra of AGP and its constituent sugars were...

journal_title：Biochemistry

authors： Matsuo K,Namatame H,Taniguchi M,Gekko K

更新日期：2009-09-29 00:00:00

abstract：:Granulocyte-colony stimulating factor (G-CSF) binds to a specific cell surface receptor and induces signals for growth and differentiation in cells of granulocyte hematopoietic lineage. In order to understand how G-CSF binding initiates signals into these cells, we have studied its interactions with the entire extrace...

journal_title：Biochemistry

authors： Horan T,Wen J,Narhi L,Parker V,Garcia A,Arakawa T,Philo J

更新日期：1996-04-16 00:00:00

abstract：:It is well-known that caldesmon (CaD) is a substrate for casein kinase II (CKII), and the phosphorylation of CaD by CKII regulates the interaction of CaD with myosin. However, the functionally relevant CKII phosphorylation site(s) on CaD and the precise role of CaD phosphorylation by CKII in mediating CaD's function h...

journal_title：Biochemistry

authors： Wang Z,Yang ZQ

更新日期：2000-09-12 00:00:00

abstract：:TrkH is a transmembrane protein that mediates uptake of K(+) through the cell membrane. Despite the recent determination of its crystallographic structure, the nature of the permeation mechanism is still unknown, that is, whether K(+) ions move across TrkH by active transport or passive diffusion. Here, molecular dyna...

journal_title：Biochemistry

authors： Domene C,Furini S

更新日期：2012-02-28 00:00:00

abstract：:DNA photolyase from Escherichia coli contains FAD plus a partially characterized, second chromophore. In vivo, the flavin is fully reduced (FADH2), but oxidation to a stable, blue radical (FADH.) occurs during enzyme isolation. The second chromophore is irreversibly reduced by reaction of the enzyme with sodium borohy...

journal_title：Biochemistry

authors： Jorns MS,Wang B,Jordan SP

更新日期：1987-10-20 00:00:00

abstract：:Activated receptors with a tyrosine kinase activity induce a variety of responses like changes in the differentiation and mitogenic status of cells. These responses are mediated in part by p21ras. Some of these activated receptors induce in certain cell types a pronounced, but transient, increase in Ras-GTP. We have s...

journal_title：Biochemistry

authors： Osterop AP,Medema RH,Ouwens DM,Van der Zon GC,Möller W,Maassen JA

更新日期：1994-06-14 00:00:00

abstract：:RecA-catalyzed DNA recombination is initiated by a mandatory, high-energy form of DNA in RecA-nucleoprotein filaments, where bases are highly unstacked and the backbone is highly unwound. Interestingly, only the energetics consequent to adenosine triphosphate (ATP) binding, rather than its hydrolysis, seems sufficient...

journal_title：Biochemistry

authors： Ramreddy T,Sen S,Rao BJ,Krishnamoorthy G

更新日期：2003-10-21 00:00:00

abstract：:To determine the active site cysteine residue in aldehyde dehydrogenase, we mutated amino acid residues 49, 162, and 302 of recombinantly expressed rat liver mitochondrial (class 2) aldehyde dehydrogenase. The C49A and C162A mutants were fully active tetrameric enzymes, although the C162A mutant was found to be highly...

journal_title：Biochemistry

authors： Farrés J,Wang TT,Cunningham SJ,Weiner H

更新日期：1995-02-28 00:00:00

abstract：:FLI1 (Friend leukemia integration 1) is a metazoan transcription factor that is upregulated in a number of cancers. In addition, rearrangements of the fli1 gene cause sarcomas, leukemias, and lymphomas. These rearrangements encode oncogenic transcription factors, in which the DNA binding domain (DBD or ETS domain) of ...

journal_title：Biochemistry

authors： Hou C,Tsodikov OV

更新日期：2015-12-22 00:00:00

abstract：:Transcarboxylase (TC) is a multisubunit enzyme that catalyzes the transfer of a carboxylate group from methylmalonyl-CoA (MMCoA) to pyruvate. The CO2- group is shuttled between the MMCoA and pyruvate binding sites by a biotin cofactor, covalently linked to the 1.3S subunit. Fully carboxylated 1.3S can be prepared in v...

journal_title：Biochemistry

authors： Rivera-Hainaj RE,Pusztai-Carey M,Venkat Reddy D,Choowongkomon K,Sönnichsen FD,Carey PR

更新日期：2002-02-19 00:00:00

abstract：:Pancreatic and duodenal homeobox 1 (Pdx1) is a homeodomain transcription factor belonging to the ParaHox family. Pdx1 plays an essential role in pancreatic endocrine and exocrine cell development and maintenance of adult islet beta-cell function. Mutations in the human pdx1 gene are linked to an early onset form of no...

journal_title：Biochemistry

authors： Longo A,Guanga GP,Rose RB

更新日期：2007-03-20 00:00:00

abstract：:Escherichia coli tyrosine kinase (Etk) regulates the export of pathogenic capsular polysaccharide (CPS) by intermolecularly autophosphorylating its C-terminal tyrosine cluster. The kinase Etk, however, needs to be first activated by the intramolecular phosphorylation of a tyrosine residue, Y574, next to the active sit...

journal_title：Biochemistry

authors： Lu T,Tan H,Lee D,Chen G,Jia Z

更新日期：2009-08-25 00:00:00

abstract：:Kinetic study of a series of compounds containing the thrombin-directed peptide D-Phe-ProboroArg-OH had indicated that the structure of the N-terminal blocking group may be correlated with binding [Kettner, C., Mersinger, L., & Knabb, R. (1990) J. Biol. Chem. 265, 18289-18297]. In order to further study this phenomeno...

journal_title：Biochemistry

authors： Nienaber VL,Mersinger LJ,Kettner CA

更新日期：1996-07-30 00:00:00

abstract：:Earlier thermodynamic studies of the intermolecular interactions between mature oxytocin and neurophysin, and of the effects of these interactions on neurophysin folding, raised questions about the intramolecular interactions of oxytocin with neurophysin within their common precursor. To address this issue, the disulf...

journal_title：Biochemistry

authors： Eubanks S,Lu M,Peyton D,Breslow E

更新日期：1999-10-12 00:00:00

abstract：:Glycinamide ribonucleotide transformylase, the first of the two formyl group transferases of de novo purine biosynthesis requiring 10-formyltetrahydrofolate, has been purified 1500-fold, nearly to homogeneity, from the murine lymphoma cell line L5178Y. Purification of the enzyme was facilitated by the use of a gelatin...

journal_title：Biochemistry

authors： Caperelli CA

更新日期：1985-03-12 00:00:00

abstract：:Fluorometric titrations of papain, succinyl-papain, and the corresponding methylthio derivatives of Cys-25 (papain-S-SCH3 and succinyl-papain-S-SCH3) were determined. Removal of the methylthio group from Cys-25 resulted in an increase of approximately 4 pK units in the fluorometrically determined pK value. The corresp...

journal_title：Biochemistry

authors： Johnson FA,Lewis SD,Shafer JA

更新日期：1981-01-06 00:00:00