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Crystal structure of E. coli regulator of ribonuclease activity A (RraA) bound to fragment of DEAD-box protein RhlB
Structural highlights
FunctionRRAA_ECOLI Globally modulates RNA abundance by binding to RNase E (Rne) and regulating its endonucleolytic activity. Can modulate Rne action in a substrate-dependent manner by altering the composition of the degradosome. Modulates RNA-binding and helicase activities of the degradosome.[1] [2] [3] [4] [5] Publication Abstract from PubMedMembers of the DEAD-box family of RNA helicases contribute to virtually every aspect of RNA metabolism, in organisms from all domains of life. Many of these helicases are constituents of multi-component assemblies, and their interactions with partner proteins within the complexes underpin their activities and biological function. In Escherichia coli the DEAD-box helicase RhlB is a component of the multi-enzyme RNA degradosome assembly, and its interaction with the core ribonuclease RNase E boosts the ATP-dependent activity of the helicase (1,2). Earlier studies have identified the regulator of ribonuclease activity A (RraA) as a potential interaction partner of both RNase E and RhlB (3). We present structural and biochemical evidence showing how RraA can bind to, and modulate the activity of RhlB and another E. coli DEAD-box enzyme, SrmB. Crystallographic structures are presented of RraA in complex with a portion of the natively unstructured C-terminal tail of RhlB at 2.8 A resolution, and in complex with the C-terminal RecA-like domain of SrmB at 2.9 A. The models suggest two distinct mechanisms by which RraA might modulate the activity of these and potentially other helicases. Potential regulatory interactions of Escherichia coli RraA protein with DEAD-box helicases.,Pietras Z, Hardwick SW, Swiezewski S, Luisi BF J Biol Chem. 2013 Sep 17. PMID:24045937[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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