UNIPROT #

P04792

PROTEIN NAME

Phospho-Hsp27(S82)

SYNONYMS

Heat shock 27kDa protein antibody; 28 kDa heat shock protein antibody; CMT2F antibody; DKFZp586P1322 antibody; epididymis secretory protein Li 102 antibody; Estrogen regulated 24 kDa protein antibody; Estrogen-regulated 24 kDa protein antibody; Heat shock 25kDa protein 1 antibody; Heat shock 27 kDa protein antibody; Heat shock 27kD protein 1 antibody; Heat shock 27kDa protein 1 antibody; Heat shock 28kDa protein 1 antibody; Heat Shock Protein 27 antibody; Heat shock protein beta 1 antibody; Heat shock protein beta-1 antibody; heat shock protein family B (small) member 1 antibody; HEL-S-102 antibody; HMN2B antibody; HS.76067 antibody; Hsp 25 antibody; HSP 27 antibody; Hsp 28 antibody; Hsp B1 antibody; Hsp25 antibody; HSP27 antibody; Hsp28 antibody; HspB1 antibody; HSPB1_HUMAN antibody; SRP27 antibody; Stress responsive protein 27 antibody; Stress-responsive protein 27 antibody

SEQUENCE SIMILARITIES

Belongs to the small heat shock protein (HSP20) family.

TISSUE SPECIFICITY

Detected in all tissues tested: skeletal muscle, heart, aorta, large intestine, small intestine, stomach, esophagus, bladder, adrenal gland, thyroid, pancreas, testis, adipose tissue, kidney, liver, spleen, cerebral cortex, blood serum and cerebrospinal fluid. Highest levels are found in the heart and in tissues composed of striated and smooth muscle.

POST-TRANSLATIONAL MODIFICATION

Phosphorylated upon exposure to protein kinase C activators and heat shock. Phosphorylation by MAPKAPK2 and MAPKAPK3 in response to stress dissociates HSPB1 from large small heat-shock protein (sHsps) oligomers and impairs its chaperone activity and ability to protect against oxidative stress effectively. Phosphorylation by MAPKAPK5 in response to PKA stimulation induces F-actin rearrangement.

SUBCELLULAR LOCATION

Cytoplasm, Nucleus.

FUNCTION

HSP 27 is a constitutively expressed cytoplasmic protein that co-localizes to the nucleus upon stress-induced insult. Heat shock, cytokines and hormones are among the factors that stimulate the synthesis of HSP 27. The intracellular concentration of the mammalian heat shock protein, HSP 27, increases several-fold after heat shock and other metabolic stresses, and is closely associated with the acquisition of thermotolerance. MAP kinase-activated protein kinase-2 phosphorylates HSP 27 on Serine residues Ser 15, Ser 78 and Ser 82, which are phosphorylated in vivo in response to growth factors and heat shock. Ser 15, Ser 78 and Ser 82 occur in the sequence motif RXXS, which is recognized by ribosomal protein S6 kinase II.