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- ********************************************
- * Pancreatic ribonuclease family signature *
- ********************************************
-
- Pancreatic ribonucleases (EC 3.1.27.5) are pyrimidine-specific endonucleases
- present in high quantity in the pancreas of a number of mammalian taxa and of
- a few reptiles [1,2]. As shown in the following schematic representation of
- the sequence of pancreatic RNases there are four conserved disulfide bonds and
- three amino acid residues involved in the catalytic activity.
-
- +---------------------------+
- | +------------------|------+
- | | | |
- xxxxx#xxxxxxCxxxxxxC#xxxxxxxCxxCxxxCxxxxxCxxxxxCxxxxxxCxxx#xxx
- | **** | | |
- | +---+ |
- +----------------------------+
-
- 'C': conserved cysteine involved in a disulfide bond.
- '#': active site residue.
- '*': position of the pattern.
-
- A number of other proteins belongs to the pancreatic RNAse family and these
- are listed below.
-
- - Bovine seminal vesicle and bovine brain ribonucleases.
- - The kidney non-secretory ribonucleases (also known as eosinophil-derived
- neurotoxin (EDN) [3]).
- - Liver-type ribonucleases [4].
- - Angiogenin, which induces vascularization of normal and malignant tissues.
- It abolishes protein synthesis by specifically hydrolyzing cellular tRNAs.
- - Eosinophil cationic protein (ECP) [5], a cytotoxin and helminthotoxin with
- ribonuclease activity.
- - Frog liver ribonuclease and frog sialic acid-binding lectin [6].
-
- The signature pattern we developed for these proteins includes five conserved
- residues: a cysteine involved in a disulfide bond, a lysine involved in the
- catalytic activity and three other residues important for substrate binding.
-
- -Consensus pattern: C-K-x(2)-N-T-F
- [C is involved in a disulfide bond]
- [K is an active site residue]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: Red Clover Necrotic Mosaic virus
- coat protein.
- -Last update: October 1993 / Text revised.
-
- [ 1] Beintema J.J., Schuller C., Irie M., Carsana A.
- Prog. Biophys. Mol. Biol. 51:165-192(1988).
- [ 2] Beintema J.J., van der Lann J.M.
- FEBS Lett. 194:338-343(1986).
- [ 3] Rosenberg H.F., Tenen D.G., Ackerman S.J.
- Proc. Natl. Acad. Sci. U.S.A. 86:4460-4464(1989).
- [ 4] Hofsteenge J., Matthies R., Stone S.R.
- Biochemistry 28:9806-9813(1989).
- [ 5] Rosenberg H.F., Ackerman S.J., Tenen D.G.
- J. Exp. Med. 170:163-176(1989).
- [ 6] Lewis M.T., Hunt L.T., Barker W.C.
- Protein Seq. Data Anal. 2:101-105(1989).
-