Specific Recognition of an rU2-N15-rU Motif by VP55, the Vaccinia Virus Poly(A) Polymerase Catalytic Subunit
نویسندگان
چکیده
منابع مشابه
A MODEL FOR THE BASIC HELIX- LOOPHELIX MOTIF AND ITS SEQUENCE SPECIFIC RECOGNITION OF DNA
A three dimensional model of the basic Helix-Loop-Helix motif and its sequence specific recognition of DNA is described. The basic-helix I is modeled as a continuous ?-helix because no ?-helix breaking residue is found between the basic region and the first helix. When the basic region of the two peptide monomers are aligned in the successive major groove of the cognate DNA, the hydrophobi...
متن کاملRNA binding characteristics and overall topology of the vaccinia poly(A) polymerase-processivity factor-primer complex
The vaccinia virus-encoded heterodimer responsible for poly(A) tail elongation comprises a polyadenylylation catalytic subunit (VP55) and associated processivity factor (VP39). We show that monomeric VP39's affinity for RNA homopolymers follows the hierarchy poly(I) >poly(U) >>poly(G) >poly(A) >poly(C), that the heterodimer interacts stably with 40-45 nucleotide nucleic acid segments, and that ...
متن کاملThe DNA binding domain of the vaccinia virus early transcription factor small subunit is an extended helicase-like motif.
The vaccinia virus early transcription factor (VETF) is an ATP-dependent activator of the early class of viral genes. VETF is a heterodimeric protein that binds an initiator-like element surrounding the start site of transcription. Previous studies indicated that the small subunit of VETF contacts the promoter DNA. We have taken a mutational approach to determine sequences in the VETF small sub...
متن کاملStimulation of poly(A) tail elongation by the VP39 subunit of the vaccinia virus-encoded poly(A) polymerase.
The VP55 subunit of the vaccinia virus-encoded poly(A) polymerase can add a maximum of 35 adenylates to the 3'-end of an RNA primer in a rapid and highly processive manner, whereas the VP55-VP39 heterodimer catalyzes the formation of poly(A) tails several hundred nucleotides in length. Here, we describe the overexpression of the VP39 subunit, its purification to near homogeneity, and its abilit...
متن کاملSpecific inhibition of herpes simplex virus DNA polymerase by helical peptides corresponding to the subunit interface.
The herpes simplex virus DNA polymerase consists of two subunits--a catalytic subunit and an accessory subunit, UL42, that increases processivity. Mutations affecting the extreme C terminus of the catalytic subunit specifically disrupt subunit interactions and ablate virus replication, suggesting that new antiviral drugs could be rationally designed to interfere with polymerase heterodimerizati...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1997
ISSN: 0021-9258
DOI: 10.1074/jbc.272.50.31542