Protein phosphorylation in human peripheral nerve: altered phosphorylation of a 25-kDa glycoprotein in leprosy.
Protein phosphorylation in a low speed supernatant of human peripheral nerve (tibial and sural) homogenate was investigated. The major phosphorylated proteins had molecular mass in the range of 70, 55, 45, and 25 kDa. Mg2+ or Mn2+ was essential for maximum phosphorylation although Zn2+, Co2+, and Ca2+ could partially support phosphorylation. External protein substrates casein and histone were also phosphorylated. The protein phosphatase inhibitor orthovanadate enhanced the phosphorylation of the 45 and 25 kDa proteins significantly. Concanavalin A-Sepharose chromatography of the phosphorylated peripheral nerve proteins showed that the 25 kDa protein was a glycoprotein. Protein phosphorylation of peripheral nerves from leprosy affected individuals was compared with normals. The phosphorylation of 25 kDa protein was decreased in most of the patients with leprosy.
Suneetha
L M
LM
Department of Neurological Sciences, Christian Medical College Hospital, Vellore, India.
Korula
R J
RJ
Balasubramanian
A S
AS
D016022:Case-Control Studies; D003711:Demyelinating Diseases / Q000378:metabolism*; D006023:Glycoproteins / Q000378:metabolism*; D006801:Humans; D007918:Leprosy / Q000378:metabolism*; D008670:Metals / Q000494:pharmacology; D008970:Molecular Weight; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D010525:Peripheral Nerves / Q000378:metabolism*; D010766:Phosphorylation; D012016:Reference Values
D006023:Glycoproteins; D008670:Metals; D009419:Nerve Tissue Proteins