RNA polymerase

Administration of poly (ADP-ribose) polymerase (PARP) inhibitors after achieving a response to platinum-containing drugs significantly prolonged relapse-free survival compared to placebo administration. PARP inhibitors have been used in clinical practice. However, patients with platinum-resistant relapsed ovarian cancer still have a poor prognosis and there is an unmet need.

11p vielonmusk 21-01-2022 11 2   Download

RNA polymerase II (Pol II) is a 12 subunit protein complex from yeast to human that is required for gene expression. Gdown1 containing Pol II [Pol II (G)] is a special form of Pol II that is catalytically inactive and heavily depends on the 30-subunit Mediator complex for its activator and basal dependent function in vitro. Here we report for the first time, the identification and the generation of a 15-subunit human Mediator complex via the novel multibac baculovirus expression system that is fully responsive to Pol II (G).

9p thiencuuchu 27-11-2021 21 3   Download

Heterogeneous nuclear ribonucleoprotein (HNRNP) A1 and A2 are the most abundant HNRNPs with nearly identical functions, and play important roles in regulating gene expression at multiple levels (i.e. transcription, posttranscription, and translation). However, the expression and regulation mechanism of HNRNPA1 and A2 themselves remain unclear. In this study, the amino acid sequences of HNRNPA1 and HNRNPA2 were compared and found to have 78% and 86% homology in key functional domains.

10p thiencuuchu 27-11-2021 10 1   Download

Bài giảng Sinh học phân tử 1: Chương 6 Cơ chế phiên mã, cung cấp cho người học những kiến thức như: Mối quan hệ giữa kiểu gen và kiểu hình; Lý thuyết trung tâm – Central dogma; Đặc điểm cấu tạo của enzyme RNA polymerase;... Mời các bạn cùng tham khảo!

51p caphesuadathemmatong 25-11-2021 31 3   Download

Bài viết này trình bày về protein RdRp tái tổ hợp của virus gây bệnh tay chân miệng (FMDV) đã được tinh sạch và kiểm tra các hoạt tính sinh hóa. Protein RdRp tái tổ hợp với độ tinh sạch hơn 98% đã được thu nhận và thể hiện hoạt tính RNA polymerase với sự tổng hợp RNA phụ thuộc mồi. Mời các bạn cùng tham khảo!

9p tunelove 12-06-2021 25 3   Download

Kỹ thuật tái bản đẳng nhiệt (LAMP) là một phương pháp tái bản acid nucleic (DNA hoặc RNA) trong một nhiệt độ duy nhất sử dụng một bộ mồi được thiết kế đặc biệt và một DNA polymerase có khả năng vừa tách mạch đôi vừa tổng hợp. Sản phẩm DNA là cấu trúc gốc vòng do sự lặp lại nhiều lần của gen đích.

6p cumeo2004 02-07-2018 314 18   Download

Bài viết tiếp tục bổ sung phân tích phả hệ đơn gen từng gen nrSSU (nuclear ribosomal small subunit) hay rpb1 (largest subunit of RNA polymerase II), cũng như phân tích kết hợp dữ liệu đa gen, bao gồm nrLSU (nuclear ribosomal large subunit) cùng với nrSSU và rpb1. Các kết luận phân tích phả hệ trong công bố này một lần nữa ủng hộ quan điểm các mẫu nấm DL0038A và B có quan hệ rất gần hoặc chính là Cordyceps takaomontana – thể hữu tính và Isaria tenuipes – thể vô tính.

11p baoanhlib 24-01-2017 92 3   Download

Bài giảng Sinh học phân tử: Chương 4 "Quá trình phiên mã ở Prokaryote" trình bày những nội dung cụ thể sau: Quá trình phiên mã ở Prokaryote, RNA polymerase, cấu trúc của Holoenzyme, sự gắn RNA Polymerase, khởi đầu phiên mã (Initiation),...và các nội dung liên quan khác. Mời các bạn cùng tham khảo.

21p hihihaha2 03-12-2016 98 8   Download

Chapter 8 - Major shifts in bacterial transcription. In this chapter, students will be able to understand: Sigma factor switching, the RNA polymerase encoded in phage T7, infection of E. coli by phage λ,...and another contents.

40p tangtuy05 30-03-2016 51 4   Download

Chapter 6 - The mechanism of transcription in bacteria. In this chapter we will focus on the basic mechanism of transcription. We will begin with RNA polymerase, the enzyme that catalyzes transcription. We will also look at the interaction between RNA polymerase and DNA.

55p tangtuy05 30-03-2016 76 3   Download

The main contents of this chapter include all of the following: Categories of activators, structures of the DNA-Binding motifs of activators, independence of the domains of activators, functions of activators, interaction among activators, regulation of transcription factors.

53p tangtuy05 30-03-2016 63 4   Download

In chapter 6 we learned that bacteria have only one RNA polymerase, which makes all three of the familiar RNA types: mRNA, rRNA, and tRNA. In this chapter we will see that three distinct RNA polymerases occur in the nuclei of eukaryotic cells. Each of these is responsible for transcribing a separate set of genes, and each recognizes a different kind of promoter.

31p tangtuy05 30-03-2016 62 3   Download

Chapter 11 - general transcription factors in eukaryotes. Eukaryotic RNA polymerases, unlike their bacterial counterparts, are incapable of binding by themselves to their respective promoters. Instead, they rely on proteins called transcription factors to show them the way. Such factors are grouped into two classes: general transcription factors and gene-specifi c transcription factors (activators). In this chapter we will survey the general transcription factors that interact with all three RNA polymerases and their promoters.

38p tangtuy05 30-03-2016 80 3   Download

In chapter 14, we will see that most eukaryotic genes, in contrast to typical bacterial genes, are interrupted by noncoding DNA. RNA polymerase cannot distinguish the coding region of the gene from the noncoding regions, so it transcribes everything.

47p tangtuy05 30-03-2016 43 2   Download

Enzyme sao chép một axit nucleic: Quá trình sao chép chuỗi axit nucleic tức là tổng hợp một chuỗi DNA hoặc RNA được tiến hành theo nguyên tắc bổ sung và đối song song. Việc thêm một nucleotide mới được tiến hành theo hướng 5’ → 3’. 1- Enzyme sao chép DNA → DNA Là các enzyme DNA-polymerase I, enzyme T4 DNA-polymerase, Taq polymerase tổng hợp chuỗi DNA từ một khuôn DNA hay còn gọi "enzyme phụ thuộc DNA".

5p butmaulam 23-09-2013 112 8   Download

The plastid transcription kinase (PTK), a component of the major RNA polymerase complex from mustard chloroplasts, has been implicated in redox-mediated regulation of plastid gene expression. A cloning strategy to define the PTK gene(s) resulted in the isolation of a full-length cDNA for a protein with overall high homology with the a subunit of cytosolic casein kinase (CK2) that contained an N-terminal extension for a putative plastid transit peptide.

9p system191 01-06-2013 45 4   Download

We have analyzed the response of a number of human cell lines to treatment with antisense oligodeoxynucleotides (ODNs) directed against RNA polymerase II, replication protein A, and Ha-ras. ODN-delivery to the cells was liposome-mediated or via electroporation, which resulted in di€erent intracellular locations of the ODNs. The ODN-mediated target mRNA reduction varied consider-ably between the cell lines.

10p research12 23-04-2013 38 3   Download

Minichromosomemaintenance (MCM) proteins are part of the replication licensing factor (RLF-M), which limits the initiationofDNAreplication to once per cell cycle.We have previously reported that higher order complexes of mam-malian pol II and general pol II transcription factors, referred to as pol II holoenzyme, also contain MCM pro-teins. In the present study we have analyzed in detail the interaction between MCM2 and pol II holoenzyme. N- and C- terminal deletions were introduced into epitope-tagged MCM2 and the truncated proteins were transiently expressed in 293 cells. ...

11p tumor12 22-04-2013 39 3   Download

Phosphorylation of RNA polymerase II’s largest subunit C-terminal domain (CTD) is a key event during mRNA metabolism. Numerous enzymes, including cell cycle-dependent kinases and TFIIF-dependent phosphatases tar-get the CTD. However, the repetitive nature of the CTD prevents determination of phosphorylated sites by conven-tional biochemistry methods. Fortunately, a panel of monoclonal antibodies is available that distinguishes between phosphorylated isoforms of RNA polymerase II’s (RNAP II) largest subunit....

12p tumor12 20-04-2013 49 2   Download

The transcription patterns of 64 linear double stranded DNA templates obtained with T7 RNA polymerase were investigated. These templates consisted of 17 nucleotide-long sequences under the control of the minimal bac-teriophage T7 promoter and represented all possible combinations of nucleotides at positions +8, +10 and +11.

8p tumor12 20-04-2013 32 5   Download