Download MendeleyStructural Investigations on the Interactions between Cytidine Deaminase Human APOBEC3G and DNA.
Yan, X., Lan, W., Wang, C., Cao, C.(2019) Chem Asian J 14: 2235-2241
- PubMed: 31116511
- DOI: https://doi.org/10.1002/asia.201900480
- Primary Citation of Related Structures:
6K3J, 6K3K - PubMed Abstract:
Human APOBEC3G (A3G) inhibits the replication of human immunodeficiency virus-1 by deaminating cytidine at the 3'-end in the target motif 5'-CCC-3' in viral cDNA during reverse transcription. It in vitro deaminates two consecutive cytidines in a 3'->5' order. Although a crystal structure of the A3G catalytic domain (A3G-CD2) with DNA was reported, it is unknown why residues involved in enzymatic reaction are distributed widely. Here, we introduced an iodine atom into the C-5 position of cytidine (dC 6 I ) in DNA 5'-ATTC 4 C 5 C 6 I A 7 ATT-3' (TCCC 6 I ). It switches the deamination sequence preference from CCC to TCC, although small dC 6 I deamination was observed. Solution structures of A3G-CD2 in complexes with products DNA TCUC 6 I and TCUU 6 I indicate that the substrate DNA binds A3G-CD2 in TCC and CCC modes. The dC 6 deamination correlates with the 4 th base type. The CCC mode favours dC 6 deamination, while the TCC mode results in dC 5 deamination. These studies present an extensive basis to design inhibitors to impede viral evolvability.
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Science, 345 Lingling Road, Shanghai, 200032, China.
Organizational Affiliation:
