Question: Which proteins induce inhibition of LINE-1 and Alu retrotransposition?

Context:
APOBEC3G oligomerization is associated with the inhibition of both Alu and LINE-1 retrotransposition
We have previously demonstrated that antiretroviral restriction factors, human APOBEC3 (hA3) proteins (A-H), differentially inhibit L1 retrotransposition
In this present study, we found that hA3 members also restrict Alu retrotransposition at differential levels that correlate with those observed previously for L1 inhibition
Modulation of LINE-1 and Alu/SVA retrotransposition by Aicardi-Goutières syndrome-related SAMHD1
Here, we demonstrate that the Aicardi-Goutières syndrome gene product SAMHD1, recently revealed to be an inhibitor of HIV/simian immunodeficiency virus (SIV) infectivity and neutralized by the viral Vpx protein, is also a potent regulator of LINE-1 and LINE-1-mediated Alu/SVA retrotransposition
We also found that mutant SAMHD1s of Aicardi-Goutières syndrome patients are defective in LINE-1 inhibition
SAMHD1 inhibits LINE-1 retrotransposition in dividing cells
we found that the predominantly nuclear A3B only weakly restricted infection by HIV-1, HIV-1Δvif, and human T-cell leukemia virus type 1 (HTLV-1), while significantly inhibiting LINE-1 retrotransposition
The chimeric construct A3G/B, in which the first 60 amino acids of A3B were replaced with those of A3G, restricted HIV-1, HIV-1Δvif, and HTLV-1 infection, as well as LINE-1 retrotransposition
Expression of cellular A3 proteins is sufficient for inhibition of L1 and Alu retrotransposition, but the effect of A3 proteins transferred in exosomes on retroelement mobilization is unknown.
Inhibition of LINE-1 and Alu retrotransposition by exosomes encapsidating APOBEC3G and APOBEC3F.
APOBEC3G oligomerization is associated with the inhibition of both Alu and LINE-1 retrotransposition.
Previous studies revealed that the overexpression of some A3 proteins could restrict engineered human Long INterspersed Element-1 (LINE-1 or L1) retrotransposition in HeLa cells.
APOBEC3 proteins inhibit LINE-1 retrotransposition in the absence of ORF1p binding.
We concluded that APOBEC3 proteins interfere indirectly with the LINE-1 retrotransposition pathway, probably through interference with RNA targeting.
Expression of cellular A3 proteins is sufficient for inhibition of L1 and Alu retrotransposition, but the effect of A3 proteins transferred in exosomes on retroelement mobilization is unknown
Here, we demonstrate that the Aicardi-Goutières syndrome gene product SAMHD1, recently revealed to be an inhibitor of HIV/simian immunodeficiency virus (SIV) infectivity and neutralized by the viral Vpx protein, is also a potent regulator of LINE-1 and LINE-1-mediated Alu/SVA retrotransposition
Human cytidine deaminases, including APOBEC3G (A3G) and A3F, are part of a cellular defense system against retroviruses and retroelements including non-LTR retrotransposons LINE-1 (L1) and Alu
SAMHD1 inhibits LINE-1 retrotransposition in dividing cells
Expression of cellular A3 proteins is sufficient for inhibition of L1 and Alu retrotransposition, but the effect of A3 proteins transferred in exosomes on retroelement mobilization is unknown
Selective inhibition of Alu retrotransposition by APOBEC3G.
Our data further indicate that APOBEC3G recognizes 7SL RNA and Alu RNA by its common structure, the Alu domain, suggesting a mechanism for APOBEC3G- mediated inhibition of Alu retrotransposition
Functional analysis and structural modeling of human APOBEC3G reveal the role of evolutionarily conserved elements in the inhibition of human immunodeficiency virus type 1 infection and Alu transposition.

Answer: It was demonstrated that antiretroviral restriction factors, human APOBEC3 proteins A to H, differentially inhibit LINE-1 and Alu retrotransposition. The same effect was shown to be induced by the Aicardi-Goutières syndrome gene product SAMHD1.
Exact answer: human APOBEC3 proteins A to H, Aicardi-Goutières syndrome gene product SAMHD1