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- ********************************************************************
- * ABC-2 type transport system integral membrane proteins signature *
- ********************************************************************
-
- Integral membrane components of a number of bacterial active transport systems
- have been shown to be evolutionary related and to form a distinct family
- [1,2]. These proteins are:
-
- - Escherichia coli kpsM, involved in polysialic acid export.
- - Haemophilus influenzae bexB, involved in polyribosylribitol phosphate
- capsule polysaccharide export.
- - Neisseria meningitidis ctrC, involved in polyneuraminic acid capsule
- polysaccharide export.
- - Rhizobiacae nodulation protein J (gene nodJ), probably involved in
- exporting a modified beta-1,4-linked N-acetylglucosamine oligosaccharide.
- - Streptomyces peucetius drrB, involved in exporting the antibiotics
- daunorubicin and doxorubicin.
- - Escherichia coli hypothetical protein yadH.
- - Escherichia coli hypothetical protein yhhJ.
-
- The molecular size of these proteins is around 30 Kd. They are thought to
- contain six transmembrane regions. They either form homooligomeric channels or
- associate with another type of transmembrane protein to form heteroligomers.
- Transport systems in which they participate are energized by an ATP-binding
- protein that belongs to the ABC transporter family. The designation 'ABC-2'
- has been proposed [1] for these transport systems.
-
- As a signature pattern, we selected a conserved region located in the
- C-terminal section of these proteins.
-
- -Consensus pattern: [LIVM]-x(2)-[LIVM]-[SC]-x(8)-[LIVM]-P-x(10)-P-x(2)-H-x(2)-
- [STDE]-x(2)-[RQ]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Expert(s) to contact by email: Reizer J.
- jreizer@ucsd.edu
-
- -Last update: June 1994 / Text revised.
-
- [ 1] Reizer J., Reizer A., Saier M.H. Jr.
- Protein Sci. 1:1326-1332(1992).
- [ 2] Vazquez M., Santana O., Quinto C.
- Mol. Microbiol. 8:369-377(1993).
-