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Structure of the SPRY domain of the human RNA helicase DDX1, a putative interaction platform within a DEAD-box protein

The human RNA helicase DDX1 in the DEAD-box family plays an important role in RNA processing and has been associated with HIV-1 replication and tumour progression. Whereas previously described DEAD-box proteins have a structurally conserved core, DDX1 shows a unique structural feature: a large SPRY-...

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Autores principales: Kellner, Julian N., Meinhart, Anton
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4555926/
https://www.ncbi.nlm.nih.gov/pubmed/26323305
http://dx.doi.org/10.1107/S2053230X15013709
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author Kellner, Julian N.
Meinhart, Anton
author_facet Kellner, Julian N.
Meinhart, Anton
author_sort Kellner, Julian N.
collection PubMed
description The human RNA helicase DDX1 in the DEAD-box family plays an important role in RNA processing and has been associated with HIV-1 replication and tumour progression. Whereas previously described DEAD-box proteins have a structurally conserved core, DDX1 shows a unique structural feature: a large SPRY-domain insertion in its RecA-like consensus fold. SPRY domains are known to function as protein–protein interaction platforms. Here, the crystal structure of the SPRY domain of human DDX1 (hDSPRY) is reported at 2.0 Å resolution. The structure reveals two layers of concave, antiparallel β-sheets that stack onto each other and a third β-sheet beneath the β-sandwich. A comparison with SPRY-domain structures from other eukaryotic proteins showed that the general β-sandwich fold is conserved; however, differences were detected in the loop regions, which were identified in other SPRY domains to be essential for interaction with cognate partners. In contrast, in hDSPRY these loop regions are not strictly conserved across species. Interestingly, though, a conserved patch of positive surface charge is found that may replace the connecting loops as a protein–protein interaction surface. The data presented here comprise the first structural information on DDX1 and provide insights into the unique domain architecture of this DEAD-box protein. By providing the structure of a putative interaction domain of DDX1, this work will serve as a basis for further studies of the interaction network within the hetero-oligomeric complexes of DDX1 and of its recruitment to the HIV-1 Rev protein as a viral replication factor.
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spelling pubmed-45559262015-09-22 Structure of the SPRY domain of the human RNA helicase DDX1, a putative interaction platform within a DEAD-box protein Kellner, Julian N. Meinhart, Anton Acta Crystallogr F Struct Biol Commun Research Communications The human RNA helicase DDX1 in the DEAD-box family plays an important role in RNA processing and has been associated with HIV-1 replication and tumour progression. Whereas previously described DEAD-box proteins have a structurally conserved core, DDX1 shows a unique structural feature: a large SPRY-domain insertion in its RecA-like consensus fold. SPRY domains are known to function as protein–protein interaction platforms. Here, the crystal structure of the SPRY domain of human DDX1 (hDSPRY) is reported at 2.0 Å resolution. The structure reveals two layers of concave, antiparallel β-sheets that stack onto each other and a third β-sheet beneath the β-sandwich. A comparison with SPRY-domain structures from other eukaryotic proteins showed that the general β-sandwich fold is conserved; however, differences were detected in the loop regions, which were identified in other SPRY domains to be essential for interaction with cognate partners. In contrast, in hDSPRY these loop regions are not strictly conserved across species. Interestingly, though, a conserved patch of positive surface charge is found that may replace the connecting loops as a protein–protein interaction surface. The data presented here comprise the first structural information on DDX1 and provide insights into the unique domain architecture of this DEAD-box protein. By providing the structure of a putative interaction domain of DDX1, this work will serve as a basis for further studies of the interaction network within the hetero-oligomeric complexes of DDX1 and of its recruitment to the HIV-1 Rev protein as a viral replication factor. International Union of Crystallography 2015-08-25 /pmc/articles/PMC4555926/ /pubmed/26323305 http://dx.doi.org/10.1107/S2053230X15013709 Text en © Kellner & Meinhart 2015 http://creativecommons.org/licenses/by/2.0/uk/ This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
spellingShingle Research Communications
Kellner, Julian N.
Meinhart, Anton
Structure of the SPRY domain of the human RNA helicase DDX1, a putative interaction platform within a DEAD-box protein
title Structure of the SPRY domain of the human RNA helicase DDX1, a putative interaction platform within a DEAD-box protein
title_full Structure of the SPRY domain of the human RNA helicase DDX1, a putative interaction platform within a DEAD-box protein
title_fullStr Structure of the SPRY domain of the human RNA helicase DDX1, a putative interaction platform within a DEAD-box protein
title_full_unstemmed Structure of the SPRY domain of the human RNA helicase DDX1, a putative interaction platform within a DEAD-box protein
title_short Structure of the SPRY domain of the human RNA helicase DDX1, a putative interaction platform within a DEAD-box protein
title_sort structure of the spry domain of the human rna helicase ddx1, a putative interaction platform within a dead-box protein
topic Research Communications
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4555926/
https://www.ncbi.nlm.nih.gov/pubmed/26323305
http://dx.doi.org/10.1107/S2053230X15013709
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