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PDOC00277
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1995-07-26
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* Caseins alpha/beta signature *
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Caseins [1] are the major protein constituent of milk. Caseins can be
classified into two families; the first consists of the kappa-caseins, and the
second groups the alpha-s1, alpha-s2, and beta-caseins. The alpha/beta caseins
are a rapidly diverging family of proteins. However two regions are conserved:
a cluster of phosphorylated serine residues and the signal sequence. The
signature pattern we selected for this family of proteins is based on the last
eight residues of the signal sequence.
-Consensus pattern: C-L-[LV]-A-x-A-[LVF]-A
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in SWISS-PROT: mammalian 47 Kd heat shock protein;
in these proteins the pattern also corresponds to the signal peptide.
-Note: alpha-s2 casein is known as epsilon-casein in mouse, gamma-casein in
rat and casein-A in guinea pig. Alpha-s1 casein is known as alpha-casein in
rat and rabbit and as casein-B in guinea-pig.
-Last update: December 1992 / Text revised.
[ 1] Holt C., Sawyer L.
Protein Eng. 2:251-259(1988).