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TitleKSHV but not MHV-68 LANA induces a strong bend upon binding to terminal repeat viral DNA.
Journal, issue, pagesNucleic Acids Res, Vol. 43, Issue 20, Page 10039-10054, Year 2015
Publish dateNov 16, 2015
AuthorsRajesh Ponnusamy / Maxim V Petoukhov / Bruno Correia / Tania F Custodio / Franceline Juillard / Min Tan / Marta Pires de Miranda / Maria A Carrondo / J Pedro Simas / Kenneth M Kaye / Dmitri I Svergun / Colin E McVey /
PubMed AbstractLatency-associated nuclear antigen (LANA) is central to episomal tethering, replication and transcriptional regulation of γ2-herpesviruses. LANA binds cooperatively to the terminal repeat (TR) ...Latency-associated nuclear antigen (LANA) is central to episomal tethering, replication and transcriptional regulation of γ2-herpesviruses. LANA binds cooperatively to the terminal repeat (TR) region of the viral episome via adjacent LANA binding sites (LBS), but the molecular mechanism by which LANA assembles on the TR remains elusive. We show that KSHV LANA and MHV-68 LANA proteins bind LBS DNA using strikingly different modes. Solution structure of LANA complexes revealed that while kLANA tetramer is intrinsically bent both in the free and bound state to LBS1-2 DNA, mLANA oligomers instead adopt a rigid linear conformation. In addition, we report a novel non-ring kLANA structure that displays more flexibility at its assembly interface than previously demonstrated. We identified a hydrophobic pivot point located at the dimer-dimer assembly interface, which gives rotational freedom for kLANA to adopt variable conformations to accommodate both LBS1-2 and LBS2-1-3 DNA. Alterations in the arrangement of LBS within TR or at the tetramer assembly interface have a drastic effect on the ability of kLANA binding. We also show kLANA and mLANA DNA binding functions can be reciprocated. Although KSHV and MHV-68 are closely related, the findings provide new insights into how the structure, oligomerization, and DNA binding of LANA have evolved differently to assemble on the TR DNA.
External linksNucleic Acids Res / PubMed:26424851 / PubMed Central
MethodsSAS (X-ray synchrotron) / X-ray diffraction
Resolution3.8 Å
Structure data

SASDAM8:
MHV-68 LANA (Latency-associated nuclear antigen, mLANA)
Method: SAXS/SANS

SASDAN8:
mLBS1-2 DNA (MHV-68 TR DNA, mLBS1-2)
Method: SAXS/SANS

SASDAP8:
kLBS1-2 DNA
Method: SAXS/SANS

SASDAQ8:
kLANA mutant dimer-tetramer mixture (ORF73 tetramer, kLANA mutant K1109E + ORF73 dimer, kLANA mutant K1109E)
Method: SAXS/SANS

SASDAR8:
mLANA 124-316 mLBS1-2 8:1 complex (MHV-68 TR DNA, mLBS1-2 + Latency-associated nuclear antigen, mLANA)
Method: SAXS/SANS

PDB-5a76:
KSHV LANA (ORF73) C-terminal domain, open non-ring conformation: orthorhombic crystal form
Method: X-RAY DIFFRACTION / Resolution: 3.8 Å

Chemicals

ChemComp-MG:
Unknown entry

Source
  • Murid herpesvirus 4 (Murine herpesvirus 68)
  • Unidentified herpesvirus
  • human herpesvirus 8
KeywordsDNA BINDING PROTEIN / DNA / VIRAL / PROTEIN FOLDING / PROTEIN STRUCTURE / TERTIARY / RHADINOVIRUS / VIRAL PROTEINS / VIRUS LATENCY

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