A30 Identification of MOAG-4/SERF as a regulator of age related proteotoxicity

Backbone resonance assignments and dynamics of S. cerevisiae SERF

Abnormal protein aggregation and precipitation are associated with the perturbation of cellular function and underlie a variety of neurodegenerative diseases. S. cerevisiae SERF (ScSERF), a homolog of modifier of aggregation-4 (MOAG-4) and small EDRK-rich factor protein (SERF1a) is highly conserved and discovered as an enhancer of amyloid formation of Aβ40 and α-synuclein both in vitro and in vivo. However, the detailed molecular mechanism whereby ScSERF and its homologs accelerate amyloid formation is not well known yet. Herein, we present the ¹ H, ¹⁵ N and ¹³ C NMR assignments of the 68 amino acids long ScSERF. Although ScSERF displays a very high degree of disorder, secondary chemical shifts of C_α, C_β, ¹⁵ N{¹ H}-NOE values and the residue-specific secondary structure propensity (SSP) scores indicate the segment spanning residues 36E-65 K has a strong helical propensity. This work sets the stage for further detailed structural and dynamic investigations of ScSERF and the molecular mechanism it utilizes in accelerating amyloid formation.