Function: Major acute phase reactant. Apolipoprotein of the HDL complex.
Subcellular location: Secreted.
Tissue specificity: Expressed by the liver; secreted in plasma. Ref.18
Induction: Upon cytokine stimulation.
Post-translational modification: This protein is the precursor of amyloid protein A, which is formed by the removal of approximately 24 residues from the C-terminal end.
Polymorphism: At least 5 different SAA1 alleles have been described: SAA1.1 (SAA1alpha), SAA1.2 (SAA1beta), SAA1.3 (SAA1gamma), SAA1.4 (SAA1delta), SAA1.5 (also named SAA1beta but which differs from SAA1.2). We use here the revised nomenclature described in Ref.21. The sequence shown is that of SAA1.1.
Involvement in disease: Reactive, secondary amyloidosis is characterized by the extracellular accumulation in various tissues of the SAA1 protein. These deposits are highly insoluble and resistant to proteolysis; they disrupt tissue structure and compromise function. Ref.14Elevated serum SAA1 protein levels may be associated with lung cancer. Ref.14
Sequence similarities: Belongs to the SAA family.
Mass spectrometry: Molecular mass is 11702±14 Da from positions 19 - 122. Determined by MALDI. Ref.18Molecular mass is 11682.7 Da from positions 19 - 122. Determined by MALDI. Ref.22Molecular mass is 11526.5 Da from positions 20 - 122. Determined by MALDI. Ref.22Molecular mass is 11439.6 Da from positions 21 - 122. Determined by MALDI. Ref.22Molecular mass is 11363.6 Da from positions 20 - 121. Determined by MALDI. Ref.22Molecular mass is 11235.6 Da from positions 20 - 120. Determined by MALDI. Ref.22Molecular mass is 10872.6 Da from positions 22 - 119. Determined by MALDI. Ref.22Molecular mass is 8337.5±0.8 Da from positions 19 - 94. Determined by ESI. With variants Ala-70, Val-75, Asn-78 and 86-Leu-Thr-87. Ref.14Molecular mass is 8390.9±0.2 Da from positions 19 - 94. Determined by ESI. With variant Ala-70. Ref.14
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