The Gam protein of bacteriophage Mu is an orthologue of eukaryotic Ku.
نویسندگان
چکیده
Mu bacteriophage inserts its DNA into the genome of host bacteria and is used as a model for DNA transposition events in other systems. The eukaryotic Ku protein has key roles in DNA repair and in certain transposition events. Here we show that the Gam protein of phage Mu is conserved in bacteria, has sequence homology with both subunits of Ku, and has the potential to adopt a similar architecture to the core DNA-binding region of Ku. Through biochemical studies, we demonstrate that Gam and the related protein of Haemophilus influenzae display DNA binding characteristics remarkably similar to those of human Ku. In addition, we show that Gam can interfere with Ty1 retrotransposition in Saccharomyces cerevisiae. These data reveal structural and functional parallels between bacteriophage Gam and eukaryotic Ku and suggest that their functions have been evolutionarily conserved.
منابع مشابه
Purification of the gam gene-product of bacteriophage Mu and determination of the nucleotide sequence of the gam gene.
The gam gene of bacteriophage Mu encodes a protein which protects linear double stranded DNA from exonuclease degradation in vitro and in vivo. We purified the Mu gam gene product to apparent homogeneity from cells in which it is over-produced from a plasmid clone. The purified protein is a dimer of identical subunits of 18.9 kd. It can aggregate DNA into large, rapidly sedimenting complexes an...
متن کاملطراحی و ساخت نانو زیست ذرات فاژی نوترکیب به عنوان کاندیدای حامل واکسن ژنی- خوراکی
Background and Objective : Bacteriophage vectors recently have been considered as a gene transfer and vaccine delivery vehicles chiefly due to their low cost, safety, and physical stability. Since, little is known about phage mediated gene transfer in mammalian hosts, A group of invitro experiments were performed to ascertain gene transfercapability of these vehicles . Materials and Methods...
متن کاملاستفاده از باکتریوفاژ لامبدا بهعنوان حامل آپوپتین جهت رسانش موثر آن به درون تومور BT-474 سرطان سینه انسانی
Background: Apoptin is a protein from chicken anemia virus that could induce apoptosis specifically in the cancer cells but it has not any effect in the normal cells. Phage therapy is a novel field of cancer therapy and phage nanobioparticles (NBPs) such as λ phage could be modified to deliver and express genetic cassettes into eukaryotic cells safely in contrast with animal viruses. The bacter...
متن کاملConstruction of an Eukaryotic Expression Vector Encoding Herpes Simplex Virus Type 2 Glycoprotein D and In Vitro Expression of the Desired Protein
To construct of an eukaryotic expression vector encoding herpes simplex virus type 2 (HSV-2) glycoprotein D (gD2), an Iranian isolate of HSV-2 was propagated in HeLa cell line and its DNA was extracted and used as template in polymerase chain reactions (PCR), to amplify gD2 gene. Primers were designed and the restriction enzyme sites for EcoRI and XhoI were considered at their 5′ ends respectiv...
متن کاملEngineered proteins detect spontaneous DNA breakage in human and bacterial cells
Spontaneous DNA breaks instigate genomic changes that fuel cancer and evolution, yet direct quantification of double-strand breaks (DSBs) has been limited. Predominant sources of spontaneous DSBs remain elusive. We report synthetic technology for quantifying DSBs using fluorescent-protein fusions of double-strand DNA end-binding protein, Gam of bacteriophage Mu. In Escherichia coli GamGFP forms...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- EMBO reports
دوره 4 1 شماره
صفحات -
تاریخ انتشار 2003