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- ******************************
- * Hemopexin domain signature *
- ******************************
-
- Hemopexin is a serum glycoprotein that binds heme and transports it to the
- liver for breakdown and iron recovery, after which the free hemopexin returns
- to the circulation. Structurally hemopexin consists of two similar halves of
- approximately two hundred amino acid residues connected by a histidine-rich
- hinge region. Each half is itself formed by the repetition of a basic unit of
- some 35 to 45 residues. Hemopexin-like domains have been found [1,2] in two
- other types of proteins:
-
- - In vitronectin, a cell adhesion and spreading factor found in plasma and
- tissues. Vitronectin, like hemopexin, has two hemopexin-like domains.
- - In six closely related members of the matrix metalloproteinases family
- (matrixins): interstitial collagenase (MMP-1), 72 Kd type gelatinase (MMP-
- 2), 92 Kd gelatinase (MMP-9), stromelysin-1 (MMP-3), stromelysin-2 (MMP-10)
- and stromelysin-3 (MMP-11). These zinc endoproteases have a single
- hemopexin-like domain in their C-terminal section.
-
- It is suggested that the hemopexin domain facilitates binding to a variety of
- molecules and proteins. The signature pattern for this type of domain has been
- derived from the best conserved region which is located at the beginning of
- the second repeat.
-
- -Consensus pattern: [LIA]-x(3)-W-x(2,3)-[PE]-x(2)-[LIVMFY]-[DEQ]-[SA]-[AV]-
- [LIVMFY]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1991 / Pattern and text revised.
-
- [ 1] Hunt L.T., Barker W.C., Chen H.R.
- Protein Seq. Data Anal. 1:21-26(1987).
- [ 2] Stanley K.K.
- FEBS Lett. 199:249-253(1986).
-