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Synonyms
rnase h, rnase h1, rnase hi, rnaseh, rt rnase h, hiv rnase h, t4 rnase h, rt/rnase h, lc11-rnase h1, retroviral rnase h,
more
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3'-end directed exonucleolytic cleavage of viral RNA-DNA hybrid
3'-end directed exonucleolytic cleavage of viral RNA-DNA hybrid
the selection of 5'-end-directed cleavage sites by the retroviral RNase H results from a combination of nucleotide sequence, permissible distance, and accessibility to the RNA 5'-end
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3'-end directed exonucleolytic cleavage of viral RNA-DNA hybrid
RNase H domain structure and mechanism of catalysis
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3'-end directed exonucleolytic cleavage of viral RNA-DNA hybrid
RNase H utilizes a two-metal ion mechanism of catalysis, the first metal ion A activates the nucleophilic water molecule and the second metal ion B, possibly in conjunction with metal ion A, stabilizes the transition state intermediate, substrate interactions, reaction mechanism and cleavage mode, overview
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DNA-RNA hybrid + H2O
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DNA-RNA hybrid duplex + H2O
oligonucleotides terminated with 5'-phosphate and 3'-hydroxyl moiety
DNA/DNA + H2O
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RNase H catalysis by the retroviral enzyme appears to involve a two-metal ion mechanism. Unlike cellular RNases H, the retroviral RNase H displays three different modes of cleavage: internal, 3'-end-DNA-directed, and 5'-end-RNA-directed, all three modes of cleavage appear to have essential roles in reverse transcription, overview, RNase H activities of murine retroviral reverse transcriptases preferentially cleave between two ribonucleotide residues in an RNA chain, and between the penultimate and last ribonucleotide of an extended RNA primer rather than precisely at the RNA-DNA junction
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HTS-1 RNA-DNA + H2O
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HTS-2 RNA-DNA + H2O
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additional information
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DNA-RNA hybrid + H2O
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cleavage site recognition and specificity, mechanism, in vitro synthesis of substrates, overview
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DNA-RNA hybrid + H2O
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in vitro synthesis of substrates, overview
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DNA-RNA hybrid + H2O
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sequence preference for internal cleavage. 3 distinct cleavage modes are described for retroviral RNases H that are referred to as internal, DNA 3'-end-directed and RNA 5'-end-directed cleavages
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DNA-RNA hybrid + H2O
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a Cy3-Tr35/Pd22 RNA-DNA hybrid is cut at approximately 19 base pair upstream from the 3' primer end
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DNA-RNA hybrid duplex + H2O
oligonucleotides terminated with 5'-phosphate and 3'-hydroxyl moiety
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DNA-RNA hybrid duplex + H2O
oligonucleotides terminated with 5'-phosphate and 3'-hydroxyl moiety
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DNA-RNA hybrid duplex + H2O
oligonucleotides terminated with 5'-phosphate and 3'-hydroxyl moiety
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4-30 nucleotides in length
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RNA/DNA hybrid + H2O
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RNA/DNA hybrid + H2O
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RNase H catalysis by the retroviral enzyme appears to involve a two-metal ion mechanism. Unlike cellular RNases H, the retroviral RNase H displays three different modes of cleavage: internal,3'-end-DNA-directed, and 5'-end-RNA-directed, all three modes of cleavage appear to have essential roles in reverse transcription, overview
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RNA/DNA hybrid + H2O
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secondary structure and substrate binding, overview
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additional information
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retroviral RNases H display three different modes of cleavage: internal, DNA 3' end-directed, and RNA 5' end-directed
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additional information
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retroviral RNases H display three different modes of cleavage: internal, DNA 3' end-directed, and RNA 5' end-directed
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additional information
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RNase H activity is determined by measuring the [3H]oligo(rA) released from [3H]poly(rA)*p(dT)45
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additional information
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RNase H activity is determined by measuring the [3H]oligo(rA) released from [3H]poly(rA)*p(dT)45
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additional information
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not: ss DNA
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additional information
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not: ss RNA
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additional information
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not: ds DNA
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additional information
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the enzyme is essential for retroviral replication
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additional information
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the enzyme is essential to complete retroviral replication
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additional information
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the enzyme recognizes 3' ends of DNA and 5' ends of RNA for cleavage, the enzyme cleaves downstream of a nick, recognition of internal cleavage sites, influence of 5' end position of upstream RNA on cleavage of downstream RNA, overview
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additional information
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mutations in reverse transcriptase outside of the polymerase domain may have clinical significance in resistance to nucleoside analog RT inhibitors, i.e. NRTIs
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additional information
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mutations in reverse transcriptase outside of the polymerase domain may have clinical significance in resistance to nucleoside analog RT inhibitors, i.e. NRTIs
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additional information
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the polymerization-dependent RNase H activity is insufficient to completely degrade the genomic template during minus-strand synthesis, pausing by reverse transcriptase during transcription promotes RNase H cleavages and facilitates strand transfers, overview, cleavage site selection modelling, overview, the isolated MoMLV RNase H domain retains enzymatic activity, but is unable to carry out specific cleavages such as removal of the tRNA or PPT primers in vitro, cleavage specificity of RNase H, overview
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additional information
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the polymerization-dependent RNase H activity is insufficient to completely degrade the genomic template during minus-strand synthesis, pausing by reverse transcriptase during transcription promotes RNase H cleavages and facilitates strand transfers, overview, cleavage site selection modelling, overview, the isolated MoMLV RNase H domain retains enzymatic activity, but is unable to carry out specific cleavages such as removal of the tRNA or PPT primers in vitro, cleavage specificity of RNase H, overview
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additional information
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3 distinct cleavage modes are described for retroviral RNases H that are referred to as internal, DNA 3'-end-directed and RNA 5'-end-directed cleavages
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DNA-RNA hybrid + H2O
?
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?
DNA-RNA hybrid duplex + H2O
oligonucleotides terminated with 5'-phosphate and 3'-hydroxyl moiety
RNA/DNA hybrid + H2O
?
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-
?
additional information
?
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DNA-RNA hybrid duplex + H2O
oligonucleotides terminated with 5'-phosphate and 3'-hydroxyl moiety
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?
DNA-RNA hybrid duplex + H2O
oligonucleotides terminated with 5'-phosphate and 3'-hydroxyl moiety
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?
additional information
?
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retroviral RNases H display three different modes of cleavage: internal, DNA 3' end-directed, and RNA 5' end-directed
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?
additional information
?
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retroviral RNases H display three different modes of cleavage: internal, DNA 3' end-directed, and RNA 5' end-directed
-
-
?
additional information
?
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RNase H activity is determined by measuring the [3H]oligo(rA) released from [3H]poly(rA)*p(dT)45
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?
additional information
?
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RNase H activity is determined by measuring the [3H]oligo(rA) released from [3H]poly(rA)*p(dT)45
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?
additional information
?
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the enzyme is essential for retroviral replication
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?
additional information
?
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the enzyme is essential to complete retroviral replication
-
-
?
additional information
?
-
-
mutations in reverse transcriptase outside of the polymerase domain may have clinical significance in resistance to nucleoside analog RT inhibitors, i.e. NRTIs
-
-
?
additional information
?
-
mutations in reverse transcriptase outside of the polymerase domain may have clinical significance in resistance to nucleoside analog RT inhibitors, i.e. NRTIs
-
-
?
additional information
?
-
-
3 distinct cleavage modes are described for retroviral RNases H that are referred to as internal, DNA 3'-end-directed and RNA 5'-end-directed cleavages
-
-
?
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Ca2+
competitive inhibitor
non-nucleotide or non-nucleoside reverse transcriptase inhibitor
targets the DNA polymerasec activity of reverse transcriptase. Non-competitive inhibitor that binds a hydrophobic pocket near the polymerase active site of the p66 subunit in HIV-1 reverse transcriptase
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nucleotide or nucleoside reverse transcriptase inhibitor
targets the DNA polymerasec activity of reverse transcriptase. NRTIs inhibit replication by competing with cellular dNTPs for incorporation into the nascent DNAchain; upon incorporation, the absence of a 3' hydroxyl group on the NRTI prevents additional synthesis and causes premature chain termination
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3'-azido-3'-deoxythymidine
a nucleoside analog RT inhibitor
4-[(4'-aminomethyl-1,1'-biphenyl)methyl]-1-hydroxy-1,8-naphthyridin-2-one
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potent inhibitor
7-(furan-2-yl)-2-hydroxy-isoquinoline-1,3(2H,4H)-dione
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non-nucleoside reverse transcriptase inhibitors
i.e. NNRTIs
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nucleoside analog RT inhibitors
i.e. NRTIs, nucleoside analog RT inhibitors are non-competitive inhibitors
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trihydroxybenzoylbiphenyl carboxylate hydrazone
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trihydroxybenzoylnaphthyl hydrazone
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additional information
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one potential class of RNase H inhibitors involves drugs that alter the interactions between the RNase H domain and substrate or that alter the alignment of substrate in the RNase H active site
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additional information
one potential class of RNase H inhibitors involves drugs that alter the interactions between the RNase H domain and substrate or that alter the alignment of substrate in the RNase H active site
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80000
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80000
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PAGE, sedimentation on glycerol gradients
additional information
single band with a molecular mass of 75 kDa for Moloney murine leukemia virus reverse transcriptase and the mutants MRT-D224A and MRT-D524A, SDS-PAGE. Major single bands with molecular masses in the range of 65-73 kDa, each corresponding to their calculated molecular masses (70203, 71342, 71973 and 66387 Da), respectively, for the Moloney murine leukemia virus/avian myeloblastosis virus chimeric reverse transcriptases (MRT-AF, MRT-AP, MRT-AT, and MRT-AR)
additional information
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single band with a molecular mass of 75 kDa for Moloney murine leukemia virus reverse transcriptase and the mutants MRT-D224A and MRT-D524A, SDS-PAGE. Major single bands with molecular masses in the range of 65-73 kDa, each corresponding to their calculated molecular masses (70203, 71342, 71973 and 66387 Da), respectively, for the Moloney murine leukemia virus/avian myeloblastosis virus chimeric reverse transcriptases (MRT-AF, MRT-AP, MRT-AT, and MRT-AR)
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purified recombinant mutant Mo-MLV RNase H lacking the putative helix C complexed with the DNA/RNA hybrid substrate, DELTAC monomers and dimers, equilibration against a reservoir solution of 30% PEG 4000 and 0.2 M ammonium sulfate, protein solution, containing 7-10 mg/ml, 10 mM HEPES, pH 7.0, 150 mM NaCl, 5 mM DTT, and 0.1 mM EDTA, is mixed with reservoir solution at pH 5.2-6.0, DELTAC monomer crystallization fails to yield single, large crystals, DELTAC monomer crystals are soaked in 15% PEG 4000, 20% PEG 400, 0.1 M ammonium sulfate, 150 mM NaCl, 1% 2-propanol, 1.25% PEG MME 550, 5 mM MES, pH 6.5, and 0.5 mM zinc sulfate for 5 min, X-ray diffractions tructure determination and analysis at 1.6 A resolution, modelling
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D224A
two Moloney murine leukemia virus reverse transcriptase variants (named MRT-D224A and MRT-D524A) as a negative control, in which the catalytically important residue for the reverse transcription activity, Asp224 and that for the RNase H activity, Asp524, are substituted with Ala, respectively
D524A
two Moloney murine leukemia virus reverse transcriptase variants (named MRT-D224A and MRT-D524A) as a negative control, in which the catalytically important residue for the reverse transcription activity, Asp224 and that for the RNase H activity, Asp524, are substituted with Ala, respectively
additional information
design of four Moloney murine leukemia virus/avian myeloblastosis virus chimeric reverse transcriptases (named MRT-AF, MRT-AP, MRT-AT and MRT-AR)
additional information
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design of four Moloney murine leukemia virus/avian myeloblastosis virus chimeric reverse transcriptases (named MRT-AF, MRT-AP, MRT-AT and MRT-AR)
additional information
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construction of a mutant Mo-MLV RNase H lacking the putative helix C, surface mapping and substrate binding determinants, overview
additional information
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mutations in reverse transcriptase outside of the polymerase domain may have clinical significance in resistance to nucleoside analog RT inhibitors, NRTIs, e.g. 3'-azido-3'-deoxythymidine, mutations in the RNase H domain that decrease RNase H activity can increase the resistance of reverse transcriptase to NRTIs, overview
additional information
mutations in reverse transcriptase outside of the polymerase domain may have clinical significance in resistance to nucleoside analog RT inhibitors, NRTIs, e.g. 3'-azido-3'-deoxythymidine, mutations in the RNase H domain that decrease RNase H activity can increase the resistance of reverse transcriptase to NRTIs, overview
additional information
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isolated RNase H domain of Moloney murine leukemia virus reverse transcriptase is enzymatically active, but the activity is low and exhibits a greatly relaxed substrate specificity. Primer grip residue Tyr586 in Moloney murine leukemia virus reverse transcriptase appears to be a particularly important substrate contact residue because changes at this site profoundly affect both the RNase H activity and proper substrate recognition
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Verma, I.M.
Studies on reverse transcriptase of RNA tumor viruses III. Properties of purified Moloney murine leukemia virus DNA polymerase and associated RNase H
J. Virol.
15
843-854
1975
Moloney murine leukemia virus, Moloney murine leukemia virus M-MuLV, More
brenda
Grandgenett, D.P.; Gerard, G.F.; Green, M.
Ribonuclease H: a ubiquitous activity in virions of ribonucleic acid tumor viruses
J. Virol.
10
1136-1142
1972
Avian myeloblastosis virus, feline leukemia virus, Harvey murine sarcoma virus, Mason-Pfizer monkey virus, Moloney murine leukemia virus, More, Rauscher leukemia virus, RD-feline leukemia virus, Rous sarcoma virus, Harvey murine sarcoma virus MSV-MLV(H)
brenda
Schultz, S.J.; Zhang, M.; Champoux, J.J.
Sequence, distance, and accessibility are determinants of 5'-end-directed cleavages by retroviral RNases H
J. Biol. Chem.
281
1943-1955
2006
Human immunodeficiency virus 1, Moloney murine leukemia virus
brenda
Schultz, S.J.; Zhang, M.; Champoux, J.J.
Recognition of internal cleavage sites by retroviral RNases H
J. Mol. Biol.
344
635-652
2004
Human immunodeficiency virus 1, Moloney murine leukemia virus
brenda
Lim, D.; Gregorio, G.G.; Bingman, C.; Martinez-Hackert, E.; Hendrickson, W.A.; Goff, S.P.
Crystal structure of the moloney murine leukemia virus RNase H domain
J. Virol.
80
8379-8389
2006
Moloney murine leukemia virus
brenda
Schultz, S.J.; Champoux, J.J.
RNase H activity: structure, specificity, and function in reverse transcription
Virus Res.
134
86-103
2008
Moloney murine leukemia virus, Moloney murine leukemia virus (P03355), Human immunodeficiency virus 1 (P03366), Human immunodeficiency virus 1
brenda
Champoux, J.J.; Schultz, S.J.
Ribonuclease H: properties, substrate specificity and roles in retroviral reverse transcription
FEBS J.
276
1506-1516
2009
Moloney murine leukemia virus, Avian sarcoma leukosis virus, Human immunodeficiency virus 1 (P03366)
brenda
Yasukawa, K.; Mizuno, M.; Inouye, K.
Characterization of Moloney murine leukaemia virus/avian myeloblastosis virus chimeric reverse transcriptases
J. Biochem.
145
315-324
2009
Avian myeloblastosis virus, Moloney murine leukemia virus (P03355), Moloney murine leukemia virus
brenda
Kirby, K.A.; Marchand, B.; Ong, Y.T.; Ndongwe, T.P.; Hachiya, A.; Michailidis, E.; Leslie, M.D.; Sietsema, D.V.; Fetterly, T.L.; Dorst, C.A.; Singh, K.; Wang, Z.; Parniak, M.A.; Sarafianos, S.G.
Structural and inhibition studies of the RNase H function of xenotropic murine leukemia virus-related virus reverse transcriptase
Antimicrob. Agents Chemother.
56
2048-2061
2012
Human immunodeficiency virus 1, Moloney murine leukemia virus, Xenotropic MuLV-related virus (A1Z651), Xenotropic MuLV-related virus
brenda
Babu, C.S.; Dudev, T.; Lim, C.
Differential role of the protein matrix on the binding of a catalytic aspartate to Mg2+ vs Ca2+: application to ribonuclease H
J. Am. Chem. Soc.
135
6541-6548
2013
Escherichia coli, Moloney murine leukemia virus (P03355)
brenda