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- *********************************
- * Uteroglobin family signatures *
- *********************************
-
- Uteroglobin [1] is a protein that seems specific to lagomorphes (rabbit, hare,
- and pica) and which binds progesterone specifically and with high affinity. It
- may regulate progesterone concentrations reaching the blastocyst. Uteroglobin
- is also a potent inhibitor of phospholipase A2. It is a protein of 70 amino
- acids that form antiparallel disulfide-linked dimers. The progesterone-
- binding site is formed by a cavity between the monomeric subunits. A schematic
- representation of the location of the two disulfide bonds in the antiparallel
- dimer is shown below:
-
- NH2-xxCxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxCx-COOH
- | |
- COOH-xCxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxCxx-NH2
-
- Two proteins are known to be structurally related to uteroglobin:
-
- - Clara cell 10 Kd secretory protein (CC10) [2,3]. CC10 is a protein
- expressed by non-ciliated cells of pulmonary airway surface epithelium. Its
- exact function is not known. CC10, like uteroglobin, is an inhibitor of
- phospholipase A2. It binds to polychlorinated biphenyls (PCB). Rat CC10
- binds strongly to progesterone while human CC10 binds only weakly.
- - Domestic cat major allergen I chain 1 (fel DI) [4].
-
- We derived two signature patterns specific to proteins that belong to this
- family. These are centered around the two cysteine residues involved in
- interchain disulfide bonds.
-
- -Consensus pattern: [GA]-x(3)-I-C-P-x-[LIVMF]-x(3)-[LIVM]-[DE]-x-[LIVMF](2)
- [C is involved in an interchain disulfide bond]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [DE]-K-I-x(2)-S-x-L-C
- [C is involved in an interchain disulfide bond]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: October 1993 / Patterns and text revised.
-
- [ 1] Bally R., Delettre J.
- J. Mol. Biol. 206:153-170(1989).
- [ 2] Singh G., Katyal S.L., Brown W.E., Kennedy A.L., Singh U.,
- Wong-Chong M.-L.
- Biochim. Biophys. Acta 1039:348-355(1990).
- [ 3] Nordlund-Moller L., Andersson O., Ahlgren R., Schilling J., Gillner M.,
- Gustafsson J.-A., Lund J.
- J. Biol. Chem. 265:12690-12693(1990).
- [ 4] Morgenstern J.P., Griffith I.J., Brauer A.W., Rogers B.L., Bond J.F.,
- Chapman M.D., Kuo M.-C.
- Proc. Natl. Acad. Sci. U.S.A. 88:9690-9694(1991).
-