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Conservation of fiber structure and CD46 usage by subgroup B2 adenoviruses

Research output: Contribution to journalArticlepeer-review

Abstract

Most subgroup B2 adenoviruses use CD46 as their primary receptor. Recent structural and mutagenesis studies suggested that Ad11 and Ad35 likely engage this receptor in a very similar fashion. However, no comparative studies assessing the cell-associated CD46 binding efficiencies of different Ad fibers have been performed. We solved the crystal structure of Ad35 fiber knob and constructed a model of the fiber knob complexed with CD46. Comparison of our model with that of Ad11-CD46 showed that despite a larger CD46-interacting region in the IJ loop of Ad11, the buried surface area was very similar, suggesting that both fiber knobs might exhibit similar binding. In support of this, cell based competition studies demonstrated almost identical binding efficiencies of Ad11 and Ad35 fibers to cell surface CD46. These findings shed further light on CD46 association by Ad and could impact the selection of novel Ad types for gene transfer.

Original languageEnglish (US)
Pages (from-to)573-579
Number of pages7
JournalVirology
Volume375
Issue number2
DOIs
StatePublished - Jun 5 2008
Externally publishedYes

Bibliographical note

Funding Information:
We thank Joan Gausepohl and Samia N. Naccache for comments and editorial suggestions. This work was supported by NIH grant R24 EY017540-01, NIH grant R56 AI070771 to V.S.R. and NIH grant RO1 EY11431 to G.R.N. This is done under Manuscript #19298 of The Scripps Research Institute. The coordinates of the Ad35 fiber knob structure have been deposited at RCSB PDB (PDB-ID: 3BQ4).

Keywords

  • Ad11
  • Ad35
  • Adenovirus, CD46
  • Fiber
  • Gene therapy
  • Knob
  • Membrane cofactor protein
  • Structure
  • Vector

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