scholarly journals Role of the Orc6 Protein in Origin Recognition Complex-Dependent DNA Binding and Replication in Drosophila melanogaster

2007 ◽  
Vol 27 (8) ◽  
pp. 3143-3153 ◽  
Author(s):  
Maxim Balasov ◽  
Richard P. H. Huijbregts ◽  
Igor Chesnokov
Keyword(s):  
Amino Acids ◽  
Dna Replication ◽  
Dna Binding ◽  
Origin Recognition Complex ◽  
Dominant Negative ◽  
The Core ◽  
Culture Cells ◽  
Replication Domain ◽  
Origin Recognition

ABSTRACT The six-subunit origin recognition complex (ORC) is a DNA replication initiator protein in eukaryotes that defines the localization of the origins of replication. We report here that the smallest Drosophila ORC subunit, Orc6, is a DNA binding protein that is necessary for the DNA binding and DNA replication functions of ORC. Orc6 binds DNA fragments containing Drosophila origins of DNA replication and prefers poly(dA) sequences. We have defined the core replication domain of the Orc6 protein which does not include the C-terminal domain. Further analysis of the core replication domain identified amino acids that are important for DNA binding by Orc6. Alterations of these amino acids render reconstituted Drosophila ORC inactive in DNA binding and DNA replication. We show that mutant Orc6 proteins do not associate with chromosomes in vivo and have dominant negative effects in Drosophila tissue culture cells. Our studies provide a molecular analysis for the functional requirement of Orc6 in replicative functions of ORC in Drosophila and suggest that Orc6 may contribute to the sequence preferences of ORC in targeting to the origins.

scholarly journals Structural basis of DNA replication origin recognition by human Orc6 protein binding with DNA

2020 ◽  
Vol 48 (19) ◽  
pp. 11146-11161
Author(s):  
Naining Xu ◽  
Yingying You ◽  
Changdong Liu ◽  
Maxim Balasov ◽  
Lee Tung Lun ◽  
...  
Keyword(s):  
Dna Replication ◽  
Dna Binding ◽  
Solution Structure ◽  
Origin Recognition Complex ◽  
Structural Basis ◽  
Dna Replication Origin ◽  
Dna Alterations ◽  
Replication Initiator ◽  
Binding Subunit ◽  
Origin Recognition

Abstract The six-subunit origin recognition complex (ORC), a DNA replication initiator, defines the localization of the origins of replication in eukaryotes. The Orc6 subunit is the smallest and the least conserved among ORC subunits. It is required for DNA replication and essential for viability in all species. Orc6 in metazoans carries a structural homology with transcription factor TFIIB and can bind DNA on its own. Here, we report a solution structure of the full-length human Orc6 (HsOrc6) alone and in a complex with DNA. We further showed that human Orc6 is composed of three independent domains: N-terminal, middle and C-terminal (HsOrc6-N, HsOrc6-M and HsOrc6-C). We also identified a distinct DNA-binding domain of human Orc6, named as HsOrc6-DBD. The detailed analysis of the structure revealed novel amino acid clusters important for the interaction with DNA. Alterations of these amino acids abolish DNA-binding ability of Orc6 and result in reduced levels of DNA replication. We propose that Orc6 is a DNA-binding subunit of human/metazoan ORC and may play roles in targeting, positioning and assembling the functional ORC at the origins.

scholarly journals Dendrite development

2005 ◽  
Vol 170 (4) ◽  
pp. 517-519 ◽  
Author(s):  
Michael D. Ehlers
Keyword(s):  
Dna Replication ◽  
Origin Recognition Complex ◽  
The Core ◽  
Dendrite Development ◽  
Origin Recognition

Neurons extend elaborate dendrites studded with spines. Unexpectedly, this cellular sculpting is regulated by the origin recognition complex—the core machinery for initiating DNA replication.

scholarly journals Architecture of the yeast origin recognition complex bound to origins of DNA replication.

1997 ◽  
Vol 17 (12) ◽  
pp. 7159-7168 ◽  
Author(s):  
D G Lee ◽  
S P Bell
Keyword(s):  
Dna Replication ◽  
Dna Binding ◽  
Origin Recognition Complex ◽  
Binding Assays ◽  
Chromosomal Replication ◽  
Origins Of Replication ◽  
Eukaryotic Dna ◽  
Level Of Analysis ◽  
Origin Recognition

In many organisms, the replication of DNA requires the binding of a protein called the initiator to DNA sites referred to as origins of replication. Analyses of multiple initiator proteins bound to their cognate origins have provided important insights into the mechanism by which DNA replication is initiated. To extend this level of analysis to the study of eukaryotic chromosomal replication, we have investigated the architecture of the Saccharomyces cerevisiae origin recognition complex (ORC) bound to yeast origins of replication. Determination of DNA residues important for ORC-origin association indicated that ORC interacts preferentially with one strand of the ARS1 origin of replication. DNA binding assays using ORC complexes lacking one of the six subunits demonstrated that the DNA binding domain of ORC requires the coordinate action of five of the six ORC subunits. Protein-DNA cross-linking studies suggested that recognition of origin sequences is mediated primarily by two different groups of ORC subunits that make sequence-specific contacts with two distinct regions of the DNA. Implications of these findings for ORC function and the mechanism of initiation of eukaryotic DNA replication are discussed.

scholarly journals The dynamics of replication licensing in live Caenorhabditis elegans embryos

2012 ◽  
Vol 196 (2) ◽  
pp. 233-246 ◽  
Author(s):  
Remi Sonneville ◽  
Matthieu Querenet ◽  
Ashley Craig ◽  
Anton Gartner ◽  
J. Julian Blow
Keyword(s):  
Caenorhabditis Elegans ◽  
Dna Replication ◽  
Dna Binding ◽  
Feedback Loop ◽  
Origin Recognition Complex ◽  
S Phase ◽  
Chromosomal Dna ◽  
M Phase ◽  
Prereplicative Complex

Accurate DNA replication requires proper regulation of replication licensing, which entails loading MCM-2–7 onto replication origins. In this paper, we provide the first comprehensive view of replication licensing in vivo, using video microscopy of Caenorhabditis elegans embryos. As expected, MCM-2–7 loading in late M phase depended on the prereplicative complex (pre-RC) proteins: origin recognition complex (ORC), CDC-6, and CDT-1. However, many features we observed have not been described before: GFP–ORC-1 bound chromatin independently of ORC-2–5, and CDC-6 bound chromatin independently of ORC, whereas CDT-1 and MCM-2–7 DNA binding was interdependent. MCM-3 chromatin loading was irreversible, but CDC-6 and ORC turned over rapidly, consistent with ORC/CDC-6 loading multiple MCM-2–7 complexes. MCM-2–7 chromatin loading further reduced ORC and CDC-6 DNA binding. This dynamic behavior creates a feedback loop allowing ORC/CDC-6 to repeatedly load MCM-2–7 and distribute licensed origins along chromosomal DNA. During S phase, ORC and CDC-6 were excluded from nuclei, and DNA was overreplicated in export-defective cells. Thus, nucleocytoplasmic compartmentalization of licensing factors ensures that DNA replication occurs only once.

scholarly journals Cdc6p modulates the structure and DNA binding activity of the origin recognition complex in vitro

2000 ◽  
Vol 14 (13) ◽  
pp. 1631-1641 ◽  
Author(s):  
Tohru Mizushima ◽  
Naoko Takahashi ◽  
Bruce Stillman
Keyword(s):  
Dna Replication ◽  
Dna Binding ◽  
Origin Recognition Complex ◽  
Binding Activity ◽  
Chromosomal Dna ◽  
Dna Binding Activity ◽  
Dna Binding Specificity ◽  
Dna Replication Origins ◽  
Origin Recognition

An interaction between the origin recognition complex (ORC) and Cdc6p is the first and a key step in the initiation of chromosomal DNA replication. We describe the assembly of an origin-dependent complex containing ORC and Cdc6p from Saccharomyces cerevisiae. Cdc6p increases the DNA binding specificity of ORC by inhibiting non-specific DNA binding of ORC. Cdc6p induces a concomitant change in the conformation of ORC and mutations in the Cdc6p Walker A and Walker B motifs, or ATP-γ-S inhibited these activities of Cdc6p. These data suggest that Cdc6p modifies ORC function at DNA replication origins. On the basis of these results in yeast, we propose that Cdc6p may be an essential determinant of origin specificity in metazoan species.

scholarly journals Role of Papillomavirus E1 Initiator Dimerization in DNA Replication

2005 ◽  
Vol 79 (13) ◽  
pp. 8661-8664 ◽  
Author(s):  
Stephen Schuck ◽  
Arne Stenlund
Keyword(s):  
Dna Replication ◽  
Dna Binding ◽  
Dna Binding Domains ◽  
Binding Domains ◽  
Severe Effect ◽  
Origin Of Dna Replication ◽  
Initiation Of Dna Replication

ABSTRACT Viral initiator proteins are polypeptides that form oligomeric complexes on the origin of DNA replication (ori). These complexes carry out a multitude of functions related to initiation of DNA replication, and although many of these functions have been characterized biochemically, little is understood about how the complexes are assembled. Here we demonstrate that loss of one particular interaction, the dimerization between E1 DNA binding domains, has a severe effect on DNA replication in vivo but has surprisingly modest effects on most individual biochemical activities in vitro. We conclude that the dimer interaction is primarily required for initial recognition of ori.

scholarly journals The Highly Conserved tRNAHis Guanylyltransferase Thg1p Interacts with the Origin Recognition Complex and Is Required for the G2/M Phase Transition in the Yeast Saccharomyces cerevisiae

2005 ◽  
Vol 4 (4) ◽  
pp. 832-835 ◽  
Author(s):  
Terri S. Rice ◽  
Min Ding ◽  
David S. Pederson ◽  
Nicholas H. Heintz
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Origin Recognition Complex ◽  
Nuclear Division ◽  
Permissive Temperature ◽  
Yeast Saccharomyces Cerevisiae ◽  
M Phase ◽  
And Migration ◽  
Origin Recognition

ABSTRACT Here we show that the Saccharomyces cerevisiae tRNAHis guanylyltransferase Thg1p interacts with the origin recognition complex in vivo and in vitro and that overexpression of hemagglutinin-Thg1p selectively impedes growth of orc2-1(Ts) cells at the permissive temperature. Studies with conditional mutants indicate that Thg1p couples nuclear division and migration to cell budding and cytokinesis in yeast.

scholarly journals Two Compound Replication Origins in Saccharomyces cerevisiae Contain Redundant Origin Recognition Complex Binding Sites

2001 ◽  
Vol 21 (8) ◽  
pp. 2790-2801 ◽  
Author(s):  
James F. Theis ◽  
Carol S. Newlon
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Dna Replication ◽  
Binding Site ◽  
Binding Sites ◽  
Origin Recognition Complex ◽  
Replication Origins ◽  
Discrete Site ◽  
Origin Function ◽  
Single Binding Site ◽  
Origin Recognition

ABSTRACT While many of the proteins involved in the initiation of DNA replication are conserved between yeasts and metazoans, the structure of the replication origins themselves has appeared to be different. As typified by ARS1, replication origins inSaccharomyces cerevisiae are <150 bp long and have a simple modular structure, consisting of a single binding site for the origin recognition complex, the replication initiator protein, and one or more accessory sequences. DNA replication initiates from a discrete site. While the important sequences are currently less well defined, metazoan origins appear to be different. These origins are large and appear to be composed of multiple, redundant elements, and replication initiates throughout zones as large as 55 kb. In this report, we characterize two S. cerevisiae replication origins, ARS101 and ARS310, which differ from the paradigm. These origins contain multiple, redundant binding sites for the origin recognition complex. Each binding site must be altered to abolish origin function, while the alteration of a single binding site is sufficient to inactivate ARS1. This redundant structure may be similar to that seen in metazoan origins.

scholarly journals Cleavage and Inactivation of ATM during Apoptosis

1999 ◽  
Vol 19 (9) ◽  
pp. 6076-6084 ◽  
Author(s):  
Graeme C. M. Smith ◽  
Fabrizio d’adda di Fagagna ◽  
Nicholas D. Lakin ◽  
Stephen P. Jackson
Keyword(s):  
Dna Damage ◽  
Dna Binding ◽  
Caspase 3 ◽  
Cysteine Proteases ◽  
Dominant Negative ◽  
Protein Kinase Activity ◽  
Dna Damage Signalling ◽  
In Cells

ABSTRACT The activation of the cysteine proteases with aspartate specificity, termed caspases, is of fundamental importance for the execution of programmed cell death. These proteases are highly specific in their action and activate or inhibit a variety of key protein molecules in the cell. Here, we study the effect of apoptosis on the integrity of two proteins that have critical roles in DNA damage signalling, cell cycle checkpoint controls, and genome maintenance—the product of the gene defective in ataxia telangiectasia, ATM, and the related protein ATR. We find that ATM but not ATR is specifically cleaved in cells induced to undergo apoptosis by a variety of stimuli. We establish that ATM cleavage in vivo is dependent on caspases, reveal that ATM is an efficient substrate for caspase 3 but not caspase 6 in vitro, and show that the in vitro caspase 3 cleavage pattern mirrors that in cells undergoing apoptosis. Strikingly, apoptotic cleavage of ATM in vivo abrogates its protein kinase activity against p53 but has no apparent effect on the DNA binding properties of ATM. These data suggest that the cleavage of ATM during apoptosis generates a kinase-inactive protein that acts, through its DNA binding ability, in a trans-dominant-negative fashion to prevent DNA repair and DNA damage signalling.

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