Abstract:
:The Flp recombinase of yeast and the Cre recombinase of bacteriophage P1 both belong to the lambda-integrase (Int) family of site-specific recombinases. These recombination systems recognize recombination-target sequences that consist of two 13bp inverted repeats flanking a 6 or 8bp spacer sequence. Recombination reactions involve particular geometric and topological relationships between DNA target sites at synapsis, which we investigate using nicked-circular DNA molecules. Examination of the tertiary structure of synaptic complexes formed on nicked plasmid DNAs by atomic-force microscopy, in conjunction with detailed topological analysis using the mathematics of tangles, shows that only a limited number of recombination-site topologies are consistent with the global structures of plasmids bearing directly and inversely repeated sites. The tangle solutions imply that there is significant distortion of the Holliday-junction intermediate relative to the planar structure of the four-way DNA junction present in the Flp and Cre co-crystal structures. Based on simulations of nucleoprotein structures that connect the two-dimensional tangle solutions with three-dimensional models of the complexes, we propose a recombination mechanism in which the synaptic intermediate is characterized by a non-planar, possibly near-tetrahedral, Holliday-junction intermediate. Only modest conformational changes within this structure are needed to form the symmetric, planar DNA junction, which may be characteristic of shorter-lived intermediates along the recombination pathway.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Vetcher AA,Lushnikov AY,Navarra-Madsen J,Scharein RG,Lyubchenko YL,Darcy IK,Levene SDdoi
10.1016/j.jmb.2006.01.037keywords:
subject
Has Abstractpub_date
2006-04-07 00:00:00pages
1089-104issue
4eissn
0022-2836issn
1089-8638pii
S0022-2836(06)00065-9journal_volume
357pub_type
杂志文章abstract::The effects of several agents, sugars, isotonic KCl, and a variety of drugs, on the structure of the axonal membranes of unmyelinated pike olfactory nerve have been studied by synchrotron radiation X-ray scattering experiments. The main effects of the sugars are: (i) to increase the electron density of the extra-axona...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2004.08.029
更新日期:2004-10-08 00:00:00
abstract::Staphylococcus aureus A70 produces a heat-stable bacteriocin designated aureocin A70. Aureocin A70 is encoded within a mobilisable 8 kb plasmid, pRJ6, and is active against Listeria monocytogenes. Experiments of transposition mutagenesis and gene cloning had shown that aureocin A70 production and immunity were associa...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.2001.4885
更新日期:2001-08-31 00:00:00
abstract::Maltosyltransferase (MTase) from the hyperthermophile Thermotoga maritima represents a novel maltodextrin glycosyltransferase acting on starch and malto-oligosaccharides. It catalyzes the transfer of maltosyl units from alpha-1,4-linked glucans or malto-oligosaccharides to other alpha-1,4-linked glucans, malto-oligosa...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.2001.4944
更新日期:2001-09-07 00:00:00
abstract::Cytoplasmic polyadenylation element binding protein (CPEB) provides temporal and spatial control of protein synthesis required for early development and neuronal synaptic plasticity. CPEB regulates protein expression by inhibiting polyadenylation of selected mRNA transcripts, which prevents binding of the ribosome for...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2013.03.009
更新日期:2013-06-12 00:00:00
abstract::Members of the double-stranded RNA (dsRNA) specific RNase III family are known to use a conserved dsRNA-binding domain (dsRBD) to distinguish RNA A-form helices from DNA B-form ones, however, the basis of this selectivity and its effect on cleavage specificity remain unknown. Here, we directly examine the molecular re...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2004.02.059
更新日期:2004-04-23 00:00:00
abstract::Challenges in the production of integral membrane proteins for structural studies include low expression levels, incorrect membrane insertion, aggregation and instability. In this report, we describe a "funnel approach" to overcoming these difficulties and demonstrate its efficacy in a case study of 36 prokaryotic P-t...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2007.12.059
更新日期:2008-03-14 00:00:00
abstract::Plasmid pBR322 prepared from Escherichia coli strains carrying deletion of the DNA topoisomerase I gene (delta topA) with a compensatory mutation of the DNA gyrase gene (gyrA or gyrB) and from their TopA+ transductants was analyzed by agarose gel electrophoresis followed by electron microscopy, and compared with that ...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/0022-2836(87)90338-x
更新日期:1987-05-05 00:00:00
abstract::Mycobacterium smegmatis RecA and its nucleotide complexes crystallize in three different, but closely related, forms characterized by specific ranges of unit cell dimensions. The six crystals reported here and five reported earlier, all grown under the same or very similar conditions, belong to these three forms, all ...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2007.01.058
更新日期:2007-04-06 00:00:00
abstract::Bloom syndrome protein forms an oligomeric ring structure and belongs to a group of DNA helicases showing extensive homology to the Escherichia coli DNA helicase RecQ, a suppressor of illegitimate recombination. After over-production in E.coli, we have purified the RecQ core of BLM consisting of the DEAH, RecQ-Ct and ...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/s0022-2836(03)00534-5
更新日期:2003-06-27 00:00:00
abstract::The DNA binding domain of steroid receptors coincides with the cysteine-rich region encompassing the two conserved zinc fingers. In the case of the glucocorticoid receptor (GR), a weak transactivation function has been described to be adjacent or partly overlapping to the DNA binding domain, whereas stronger trans-act...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1993.1130
更新日期:1993-03-05 00:00:00
abstract::We have collected Laue diffraction data from crystals of tomato bushy stunt virus using the full white X-ray spectrum from the wiggler magnet of the Synchrotron Radiation Source at Daresbury, U.K. A single 24 second exposure of a crystal soaked in EDTA yielded a data set that was 90% complete between 6 and 3.5 A resol...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/0022-2836(90)90278-T
更新日期:1990-08-05 00:00:00
abstract::Viral scaffolding proteins direct polymerization of major capsid protein subunits into icosahedral procapsid structures. The scaffolding protein of bacteriophage SPP1 was engineered with a C-terminal hexahistidine tag (gp11-His(6)) and purified. The protein is an alpha-helical-rich molecule with a very elongated shape...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2008.02.028
更新日期:2008-05-02 00:00:00
abstract::HBII-52 is a human brain-specific C/D box snoRNA that potentially regulates the editing and/or alternative splicing of the serotonin receptor. Forty-two nearly identical copies of the HBII-52 gene are located immediately downstream of the SNRPN protein-coding gene in an imprinted locus associated with Prader-Willi syn...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2008.06.057
更新日期:2008-09-12 00:00:00
abstract::The SH2 domain of the C-terminal Src kinase [Csk] contains a unique disulfide bond that is not present in other known SH2 domains. To investigate whether this unusual disulfide bond serves a novel function, the effects of disulfide bond formation on catalytic activity of the full-length protein and on the structure of...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2006.10.076
更新日期:2007-02-02 00:00:00
abstract::Small, fast-growing bacteria make ideal subjects for genetic and quantitative analysis alike. Long the darling of theoreticians, efforts to understand the relationship between cell growth and cell cycle progression in bacterial systems have been propelled by modelers and empiricist in equal measure. Taking a historica...
journal_title:Journal of molecular biology
pub_type: 杂志文章,评审
doi:10.1016/j.jmb.2019.04.004
更新日期:2019-05-17 00:00:00
abstract::Herpes simplex viruses (HSVs) are human pathogens that establish lytic and latent infections. Reactivation from latency occurs intermittently, which represents a lifelong source of recurrent infection. In this complex process, HSV triggers and neutralizes innate immunity. Therefore, a dynamic equilibrium between HSV a...
journal_title:Journal of molecular biology
pub_type: 杂志文章,评审
doi:10.1016/j.jmb.2013.11.012
更新日期:2014-03-20 00:00:00
abstract::The coat protein of positive-stranded RNA viruses often contains a positively charged tail that extends toward the center of the capsid and interacts with the viral genome. Electrostatic interaction between the tail and the RNA has been postulated as a major force in virus assembly and stabilization. The goal of this ...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2012.03.023
更新日期:2012-06-22 00:00:00
abstract::The solution structure of r-elafin, a specific elastase inhibitor, has been determined using NMR spectroscopy. Characterized by a flat core and a flexible N-terminal extremity, the three-dimensional structure is formed by a central twisted beta-hairpin accompanied by two external segments linked by the proteinase bind...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1997.0983
更新日期:1997-05-09 00:00:00
abstract::We have analysed antigen-contacting residues and combining site shape in the antibody Fv and Fab crystal structures now available from the Protein Data Bank. Antigen-contacting propensities are presented for each antibody residue, allowing a new definition for the complementarity determining regions (CDRs) to be propo...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1996.0548
更新日期:1996-10-11 00:00:00
abstract::Many proteins are composed of independently-folded domains connected by flexible linkers. The primary sequence and length of such linkers can set the effective concentration for the tethered domains, which impacts rates of association and enzyme activity. The length of such linkers can be sensitive to environmental co...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2020.166793
更新日期:2021-01-01 00:00:00
abstract::The chloroplast thylakoid membrane of green plants is organized in stacked grana membranes and unstacked stroma membranes. We investigated the structural organization of Photosystem II (PSII) in paired grana membrane fragments by transmission electron microscopy. The membrane fragments were obtained by a short treatme...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.2000.4037
更新日期:2000-09-01 00:00:00
abstract::The put sites of phage HK022 increase the processivity of transcription and thereby promote the expression of viral genes that are located downstream of transcription terminators. RNA polymerase molecules that have traversed a put site are converted to a terminator-resistant form by the put transcript. We analyzed the...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1997.1251
更新日期:1997-10-10 00:00:00
abstract::Ebolaviruses are causative agents of lethal hemorrhagic fever in humans and nonhuman primates. Among the filoviruses characterized thus far, Reston Ebola virus (REBOV) is the only Ebola virus that is nonpathogenic to humans despite the fact that REBOV can cause lethal disease in nonhuman primates. Previous studies als...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2010.04.022
更新日期:2010-06-11 00:00:00
abstract::A dynamic structure refinement method for X-ray crystallography, referred to as the normal mode refinement, is proposed. The Debye-Waller factor is expanded in terms of the low-frequency normal modes whose amplitudes and eigenvectors are experimentally optimized in the process of the crystallographic refinement. In th...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/0022-2836(92)90932-a
更新日期:1992-05-20 00:00:00
abstract::Examination of the ways side-chain carboxylate and amide groups in high-resolution protein crystal structures form hydrogen bonds with main-chain atoms reveals that the most common category is a two-hydrogen-bond four to five residue motif with an aspartate or asparagine (Asx) at the first residue, for which we propos...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1999.2552
更新日期:1999-03-12 00:00:00
abstract::Ferrochelatase (protoheme ferrolyase, EC 4.99.1.1) is the terminal enzyme in heme biosynthesis and catalyzes the insertion of ferrous iron into protoporphyrin IX to form protoheme IX (heme). Due to the many critical roles of heme, synthesis of heme is required by the vast majority of organisms. Despite significant inv...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2007.08.040
更新日期:2007-11-02 00:00:00
abstract::Drosophila alcohol dehydrogenase (DADH) is an NAD+-dependent enzyme that catalyzes the oxidation of alcohols to aldehydes/ketones and that is also able to further oxidize aldehydes to their corresponding carboxylic acids. The structure of the ternary enzyme-NADH-acetate complex of the slow alleloform of Drosophila mel...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2004.10.028
更新日期:2005-01-21 00:00:00
abstract::The nucleocapsid protein NCp7 of human immunodeficiency virus type 1 is characterized by two highly conserved CCHC motifs that bind Zn2+ strongly. To elucidate the striking pH-dependence of the apparent Zn2+-binding constants of these motifs further, we investigated, using 1H NMR, potentiometry and fluorescence spectr...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.2001.4770
更新日期:2001-07-13 00:00:00
abstract::Comparisons of the structures of glutamate dehydrogenase (GluDH) and leucine dehydrogenase (LeuDH) have suggested that two substitutions, deep within the amino acid binding pockets of these homologous enzymes, from hydrophilic residues to hydrophobic ones are critical components of their differential substrate specifi...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1998.2335
更新日期:1999-01-15 00:00:00
abstract::The enzyme mercuric ion reductase MerA is the central component of bacterial mercury resistance encoded by the mer operon. Many MerA proteins possess metallochaperone-like N-terminal domains (NmerA) that can transfer Hg(2+) to the catalytic core domain (Core) for reduction to Hg(0). These domains are tethered to the h...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2011.08.042
更新日期:2011-10-28 00:00:00