Download MendeleyStudies on cyanobacterial protein PipY shed light on structure, potential functions, and vitamin B6 -dependent epilepsy.
Tremino, L., Forcada-Nadal, A., Contreras, A., Rubio, V.(2017) FEBS Lett 591: 3431-3442
- PubMed: 28914444
- DOI: https://doi.org/10.1002/1873-3468.12841
- Primary Citation of Related Structures:
5NLC, 5NM8 - PubMed Abstract:
The Synechococcus elongatus COG0325 gene pipY functionally interacts with the nitrogen regulatory gene pipX. As a first step toward a molecular understanding of such interactions, we characterized PipY. This 221-residue protein is monomeric and hosts pyridoxal phosphate (PLP), binding it with limited affinity and losing it upon incubation with D-cycloserine. PipY crystal structures with and without PLP reveal a single-domain monomer folded as the TIM barrel of type-III fold PLP enzymes, with PLP highly exposed, fitting a role for PipY in PLP homeostasis. The mobile PLP phosphate-anchoring C-terminal helix might act as a trigger for PLP exchange. Exploiting the universality of COG0325 functions, we used PipY in site-directed mutagenesis studies to shed light on disease causation by epilepsy-associated mutations in the human COG0325 gene PROSC.
Organizational Affiliation:
Instituto de Biomedicina de Valencia (IBV-CSIC), CIBER de Enfermedades Raras (CIBERER-ISCIII), Valencia, Spain.
