Abstract:
:High mobility group (HMG) proteins are nuclear proteins believed to significantly affect DNA interactions by altering nucleic acid flexibility. Group B (HMGB) proteins contain HMG box domains known to bind to the DNA minor groove without sequence specificity, slightly intercalating base pairs and inducing a strong bend in the DNA helical axis. A dual-beam optical tweezers system is used to extend double-stranded DNA (dsDNA) in the absence as well as presence of a single box derivative of human HMGB2 [HMGB2(box A)] and a double box derivative of rat HMGB1 [HMGB1(box A+box B)]. The single box domain is observed to reduce the persistence length of the double helix, generating sharp DNA bends with an average bending angle of 99+/-9 degrees and, at very high concentrations, stabilizing dsDNA against denaturation. The double box protein contains two consecutive HMG box domains joined by a flexible tether. This protein also reduces the DNA persistence length, induces an average bending angle of 77+/-7 degrees , and stabilizes dsDNA at significantly lower concentrations. These results suggest that single and double box proteins increase DNA flexibility and stability, albeit both effects are achieved at much lower protein concentrations for the double box. In addition, at low concentrations, the single box protein can alter DNA flexibility without stabilizing dsDNA, whereas stabilization at higher concentrations is likely achieved through a cooperative binding mode.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
McCauley MJ,Zimmerman J,Maher LJ 3rd,Williams MCdoi
10.1016/j.jmb.2007.09.073subject
Has Abstractpub_date
2007-12-07 00:00:00pages
993-1004issue
4eissn
0022-2836issn
1089-8638pii
S0022-2836(07)01272-7journal_volume
374pub_type
杂志文章abstract::The PstI fragment (65.5% to 77.4%) of coliphage 186, known genetically to encode the major control genes, has been sequenced, and an analysis performed to assess coding capacity, transcription-translation signals, and to identify any other significant features. Our analysis indicates that the region encodes: seven gen...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/0022-2836(86)90257-3
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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
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journal_title:Journal of molecular biology
pub_type: 杂志文章
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更新日期:2007-02-16 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of molecular biology
pub_type: 杂志文章
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journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2005.11.073
更新日期:2006-04-28 00:00:00
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pub_type: 杂志文章
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更新日期:1999-05-28 00:00:00
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journal_title:Journal of molecular biology
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更新日期:2010-08-06 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2009.01.011
更新日期:2009-03-06 00:00:00
abstract::The loop between the F and G beta strands (FG loop) of the bacteriophage MS2 coat protein subunit forms inter-subunit contacts around the 5-fold and 3-fold (quasi 6-fold) axes of the T=3 protein shell. In capsids, the loop is found in two very different conformations, one in B subunits, which form the 5-fold contact, ...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1996.0089
更新日期:1996-02-23 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/0022-2836(87)90259-2
更新日期:1987-02-05 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1994.0134
更新日期:1995-03-24 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2006.05.049
更新日期:2006-07-21 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章,评审
doi:10.1016/j.jmb.2017.05.027
更新日期:2017-11-10 00:00:00
abstract::Carboxypeptidase M (CPM), an extracellular glycosylphosphatidyl-inositol(GPI)-anchored membrane glycoprotein belonging to the CPN/E subfamily of "regulatory" metallo-carboxypeptidases, specifically removes C-terminal basic residues from peptides and proteins. Due to its wide distribution in human tissues, CPM is belie...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2004.02.058
更新日期:2004-04-23 00:00:00
abstract::The trigger factor is associated with bacterial ribosomes and catalyzes proline-limited protein folding reactions. Its folding activity is very high and conserved in evolution, as shown for the homologous enzymes from Escherichia coli and Mycoplasma genitalium. The folding protein substrate (a variant of ribonuclease ...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1997.1604
更新日期:1998-04-03 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章,评审
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更新日期:2018-11-02 00:00:00
abstract::The amino acid sequence of the rod portion of talin contains strong periodic patterns with a long period of 32 to 34 residues superimposed on short periods of 7 and 7/2 residues. The rod includes 50 to 60 copies of an irregular repeated motif approximately 34 residues long. The motif itself consists of three sections:...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1994.1081
更新日期:1994-01-28 00:00:00
abstract::The ribosomal RNA multigene family in the fungus fly Sciara coprophila contains a total of only 65 to 70 repeat units. We explored the types and frequencies of variant repeats in this small multigene family by characterizing different cloned rDNA variants from Sciara. Although we did not observe any intergenic spacer ...
journal_title:Journal of molecular biology
pub_type: 杂志文章
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更新日期:1989-11-05 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::Two crystal habits, one rod shaped and the other square prismatic, of the Fab fragment of a monoclonal anti-phenylalanine hydroxylase antibody have been grown using the method of vapour phase diffusion against polyethylene glycol 6000. The square prisms diffract to better than 2.8 A, belong to the space group P1 and h...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/0022-2836(85)90121-4
更新日期:1985-11-20 00:00:00
abstract::Nhp6p is an architectural Saccharomyces cerevisiae non-histone chromosomal protein that bends DNA and plays an important role in transcription and genome stability. We used the split-ubiquitin system to isolate proteins that interact with Nhp6p in vivo, and we confirmed 11 of these protein-protein interactions with gl...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2008.03.069
更新日期:2008-05-30 00:00:00
abstract::beta-Barrel membrane proteins are found in the outer membrane of Gram-negative bacteria, mitochondria, and chloroplasts. Little is known about how residues in membrane beta-barrels interact preferentially with other residues on adjacent strands. We have developed probabilistic models to quantify propensities of residu...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1016/j.jmb.2005.09.094
更新日期:2005-12-09 00:00:00
abstract::In an X-ray diffraction study using the method of multiple isomorphous replacement, the structure of aspartate carbamoyltransferase (EC 2.1.3.2) complexed with the bisubstrate analog N-(phosphonacetyl)-L-aspartate (PALA) has been solved to 2.5 A. Ten rounds of model building and 123 cycles of restrained reciprocal spa...
journal_title:Journal of molecular biology
pub_type: 杂志文章
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更新日期:1987-02-05 00:00:00
abstract::Clinical studies have revealed that mutations in the ventricular myosin regulatory light chain (RLC) lead to the development of familial hypertrophic cardiomyopathy (FHC), an autosomal dominant disease characterized by left ventricular hypertrophy, myofibrillar disarray and sudden cardiac death. While mutations in oth...
journal_title:Journal of molecular biology
pub_type: 杂志文章
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更新日期:2006-08-11 00:00:00
abstract::Two Holliday junction analogs, JA and JP, containing identical base-paired arms have been constructed from oligonucleotides. The former is constrained to adopt an antiparallel Sigal-Alberts structure, and the latter a parallel structure, by means of single strand d(T)9 tethers. We evaluate here the free energy differe...
journal_title:Journal of molecular biology
pub_type: 杂志文章
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更新日期:1991-10-20 00:00:00
abstract::Monovalent cation binding sites on nucleic acids in solution can be localized using the isotopically labeled ammonium ion (15NH4+) as a probe in high resolution NMR spectroscopy experiments. The application of this technique to a series of DNA duplexes reveals a preference for the binding of ammonium cations in the mi...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.1998.2513
更新日期:1999-02-26 00:00:00
abstract::Protein engineering experiments and Phi(F)-value analysis of SH3 domains reveal that their transition state ensemble (TSE) is conformationally restricted, i.e. the fluctuations in the transition state (TS) structures are small. In the TS of src SH3 and alpha-spectrin SH3 the distal loop and the associated hairpin are ...
journal_title:Journal of molecular biology
pub_type: 杂志文章
doi:10.1006/jmbi.2002.5453
更新日期:2002-04-12 00:00:00