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- ********************************************
- * ADP-glucose pyrophosphorylase signatures *
- ********************************************
-
- ADP-glucose pyrophosphorylase (glucose-1-phosphate adenylyltransferase) [1,2]
- (EC 2.7.7.27) catalyzes a very important step in the biosynthesis of
- alpha 1,4-glucans (glycogen or starch) in bacteria and plants: synthesis of
- the activated glucosyl donor, ADP-glucose, from glucose-1-phosphate and ATP.
-
- ADP-glucose pyrophosphorylase is a tetrameric allosterically regulated enzyme.
- It is a homotetramer in bacteria while in plant chloroplasts and amyloplasts,
- it is a heterotetramer of two different, yet evolutionary related, subunits.
-
- There are a number of conserved regions in the sequence of bacterial and
- plant ADP-glucose pyrophosphorylase subunits. We selected three of these
- regions as signature patterns. The first two are N-terminal and have been
- proposed to be part of the allosteric and/or substrate-binding sites in the
- Escherichia coli enzyme (gene glgC). The third pattern corresponds to a
- conserved region in the central part of the enzymes.
-
- -Consensus pattern: [AG]-G-G-x-G-[ST]-x-L-x(2)-L-[TA]-x(3)-A-x-P-A-V
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: W-[FY]-x-G-T-A-[DN]-[AS]-[LIVMFYW]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: A-S-M-G-[LIVM]-Y-[IV]-[LIVMFY]-x(2)-[DENPH]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: October 1993 / First entry.
-
- [ 1] Nakata P.A., Greene T.W., Anderson J.M., Smith-White B.J., Okita T.W.,
- Preiss J.
- Plant Mol. Biol. 17:1089-1093(1991).
- [ 2] Preiss J., Ball K., Hutney J., Smith-White B.J., Li. L., Okitsa T.W.
- Pur. Appl. Chem. 63:535-544(1991).
-