Glycosylation of stress glycoprotein GP62 in cells exposed to heat-shock and subculturing

GP62 is a member of the stress glycoprotein family that was proposed to have a chaperone-like function in the heat-shock response. Using lectin blotting we have studied glycosylation of GP62 and determined that in addition to heat-shock, even simple subculturing of cells is a sufficient stimulus to provoke induction of GP62. Interestingly, both kinetics of induction and glycosylation of GP62 induced by subculturing were different than when GP62 was induced by heat-shock. While GP62 induced by heat-shock was recognized by SNA, DSA and PHA-E lectins, and not by BSA I, Con A, RCA I, SJA, UEA I, VVA, and WGA lectins, GP62 induced by subculturing was also recognized by RCA I and WGA lectins.