Phosphorylation-Dependent Mobility Shift of Proteins on SDS-PAGE is Due to Decreased Binding of SDS

Bulletin of the Korean chemical society

Yeong-Jae Seok¹  Yeon-Ran Kim¹  Young-Ha Park¹  Alan Peterkofsky¹  Chang-Ro Lee¹ 

关键词: Electrophoretic mobility shift;    Protein phosphorylation;    SDS-PAGE;    Signal transduction;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

While many eukaryotic and some prokaryotic proteins show a phosphorylation-dependent mobility shift (PDMS) on SDS-PAGE, the molecular mechanism for this phenomenon had not been elucidated. We have recently shown that the distribution of negatively charged amino acids around the phosphorylation site is important for the PDMS of some proteins. Here, we show that replacement of the phosphorylation site with a negatively charged amino acid results in a similar degree of the mobility shift of a protein as phosphorylation, indicating that the PDMS is due to the introduction of a negative charge by phosphorylation. Compared with a protein showing no shift, one showing a retarded mobility on SDS-PAGE had a decreased capacity for SDS binding. The elucidation of the consensus sequence (ΘX1-3ΘX1-3Θ, where Θ corresponds to an acidic function) for a PDMS suggests a general strategy for mutagenizing a phosphorylatable protein resulting in a PDMS.

【 授权许可】

Unknown