title: Control of ATP-dependent binding of Saccharomyces cerevisiae origin recognition complex to autonomously replicating DNA sequences.
abstract: Eukaryotic origin recognition complexes (ORCs) play pivotal roles in the initiation of chromosomal DNA replication. ORC from the yeast, Saccharomyces cerevisiae, recognizes and binds replication origins in the late G1 phase and the binding has profound implications in the progression of the cell cycle to the S-phase. Therefore, we have quantitatively analyzed the mechanism of recognition and interaction of the yeast ORC with various elements of a yeast origin of DNA replication, the autonomously replicating sequence 1 (ARS1). ORC bound all four individual A and B elements of ARS1 with reasonably high affinities. However, the highest affinity binding was observed with a DNA sequence containing both the A and B1 elements. In addition, ATP and ADP significantly modulated the binding of ORC to the combined elements as well as modulating the binding of ORC to the element A alone or in combination with the B1 element. However, binding of ORC to individual B1, B2, and B3 elements was not responsive to nucleotides. Thus, the consensus ARS sequence in element A appeared to play a pivotal role in the ATP-dependent binding of ORC to ARS1 and likely in other ARSs or origins of DNA replication.
authors.affiliation: Department of Molecular Biology, Graduate School of Biomedical Sciences, School of Osteopathic Medicine, University of Medicine & Dentistry of New Jersey, Stratford, New Jersey 08043, USA. biswassb@umdnj.edu
authors.forename: Subhasis B
authors.initials: SB
authors.lastname: Biswas
authors.forename: Sujata M
authors.initials: SM
authors.lastname: Khopde
authors.forename: Esther E
authors.initials: EE
authors.lastname: Biswas-Fiss
mesh_terms: D000244:Adenosine Diphosphate / Q000737:chemistry; D000255:Adenosine Triphosphate / Q000737:chemistry; D016880:Anisotropy; D001483:Base Sequence; D001665:Binding Sites; D002453:Cell Cycle; D004247:DNA / Q000737:chemistry*; D004261:DNA Replication; D004277:DNA, Single-Stranded / Q000235:genetics; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D005656:Fungal Proteins / Q000737:chemistry; D016193:G1 Phase; D005821:Genetic Techniques; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D009696:Nucleic Acids / Q000737:chemistry; D009711:Nucleotides / Q000737:chemistry; D051738:Origin Recognition Complex; D011485:Protein Binding; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000502:physiology*; D013696:Temperature; D013816:Thermodynamics; D014157:Transcription Factors / Q000737:chemistry / Q000502:physiology*
chemical_list: C064055:ABFI protein, S cerevisiae; D004277:DNA, Single-Stranded; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D009696:Nucleic Acids; D009711:Nucleotides; D051738:Origin Recognition Complex; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D004247:DNA