Zinc Finger-dependent HIV-1 Nucleocapsid Protein-TAR RNA Interactions

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2003 Aug 9

PMID 12907727

Citations 12

Authors

Nick Lee

Robert J Gorelick

Karin Musier-Forsyth

Affiliations

Soon will be listed here.

Abstract

In the minus-strand transfer step of HIV-1 reverse transcription, the nucleocapsid protein (NC) promotes annealing of the 3' 'R' (repeat) region of the RNA genome to its complementary sequence located in the newly synthesized minus-strand strong-stop DNA. The R region contains the highly stable transactivation response (TAR) RNA hairpin. To gain insights into the molecular details of TAR RNA-NC interactions, we carried out hydroxyl radical footprinting, as well as gel-shift and fluorescence anisotropy binding assays using wild-type and mutant forms of NC. Our results support the conclusion that NC variants with mutations in their zinc finger domains have dramatically altered TAR RNA binding interactions relative to wild-type NC. These data demonstrate that a specific zinc finger architecture is required for optimal TAR RNA binding, and help to explain the requirement for the zinc finger motifs of NC in its role as a nucleic acid chaperone in minus-strand transfer.

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