Abstract
The DNA mutagenic enzyme known as APOBEC3G (A3G) plays a critical role in innate immunity to Human Immunodeficiency Virus-1 (HIV-1 ). A3G is a zinc-dependent enzyme that mutates select deoxycytidines (dC) to deoxyuridine (dU) through deamination within nascent single stranded DNA (ssDNA) during HIV reverse transcription. This activity requires that the enzyme be delivered to viral replication complexes by redistributing from the cytoplasm of infected cells to budding virions through what appears to be an RNA-dependent process. Once inside infected cells, A3G must bind to nascent ssDNA reverse transcripts for dC to dU base modification gene editing. In this chapter we will discuss data indicating that ssDNA deaminase activity of A3G is regulated by RNA binding to A3G and ribonucleoprotein complex formation along with evidence suggesting that RNA-selective interactions with A3G are temporally and mechanistically important in this process.
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Abbreviations
- A3:
-
Collectively all APOBEC3 proteins, A3A, A3B, A3C, A3D, A3F, A3G, A3H
- AID :
-
Activation induced deaminase
- APOBEC :
-
Apolipoprotein B editing catalytic unit
- CD1:
-
N-terminal domain of dual domain APOBEC proteins
- CD2:
-
C-terminal domain of dual domain APOBEC proteins
- CLIP-Seq:
-
Crosslinking immunoprecipitation and sequencing of RNA bound to proteins
- gRNA:
-
HIV genomic RNA
- HIV:
-
Human immunodeficiency virus
- hY:
-
Human Y ncRNA
- NC:
-
Nucleocapsid portion of HIV Gag
- ncRNA:
-
Noncoding RNA
- RNP:
-
Ribonucleoprotein particle
- RT:
-
Reverse transcriptase
- RNA-Seq:
-
RNA sequencing
- ssDNA:
-
Single stranded DNA
- ZBD:
-
Zinc binding domain
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Salter, J.D., Polevoda, B., Bennett, R.P., Smith, H.C. (2019). Regulation of Antiviral Innate Immunity Through APOBEC Ribonucleoprotein Complexes. In: Harris, J., Marles-Wright, J. (eds) Macromolecular Protein Complexes II: Structure and Function . Subcellular Biochemistry, vol 93. Springer, Cham. https://doi.org/10.1007/978-3-030-28151-9_6
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