9MKP
CAEV CA Pentamer Assembled via Liposome Templating
Summary for 9MKP
| Entry DOI | 10.2210/pdb9mkp/pdb |
| EMDB information | 48333 |
| Descriptor | Capsid protein p25 (1 entity in total) |
| Functional Keywords | caev, capsid, pentamer, viral protein |
| Biological source | Caprine arthritis encephalitis virus |
| Total number of polymer chains | 1 |
| Total formula weight | 25625.03 |
| Authors | |
| Primary citation | Arizaga Jr., F.,Freniere, C.,Rey, J.S.,Cook, M.,Wu, C.,Perilla, J.R.,Xiong, Y. Exploring the Structural Divergence of HIV and SRLV Lentiviral Capsids. J.Am.Chem.Soc., 147:32883-32895, 2025 Cited by PubMed Abstract: Lentiviruses require a mature capsid to package and traffic their viral genome for successful infection and propagation. Although the HIV-1 capsid structure has been extensively studied, structural information is lacking for other lentiviral capsids, limiting our understanding. Using cryo-electron microscopy (cryo-EM) and a liposome-templating system, we assembled capsid-like particles (CLPs) and resolved capsid protein (CA) pentamer and hexamer lattice structures from the two major phylogenetic groups of small ruminant lentiviruses (SRLVs). These structures exhibit an overall lattice organization like HIV-1 but differ in key characteristics, notably the absence of inositol hexakisphosphate (IP6) in the SRLV CA lattice─a critical factor for HIV-1 capsid assembly and function. Additionally, SRLV CA pentamers show a unique N-terminal domain orientation, providing insights into SRLV capsid assembly mechanisms. These observations, together with our molecular dynamics (MD) simulation, results suggest a possible mechanism for importing deoxynucleotide triphosphate (dNTP) molecules into SRLV capsids. Furthermore, key regions of host factor interaction, such as the CypA binding motifs, have diverged in the SRLV CA assemblies. Our results contribute to understanding the SRLV lentiviral capsids which may facilitate structure-based inhibitor design strategies. PubMed: 40878534DOI: 10.1021/jacs.5c09436 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (3.5 Å) |
Structure validation
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