CATH Domain 2ypnA02

CATH Classification

Level	CATH Code	Description
	3	Alpha Beta
	3.40	3-Layer(aba) Sandwich
	3.40.190	D-Maltodextrin-Binding Protein; domain 2
	3.40.190.10	Periplasmic binding protein-like II

Domain Context

CATH Clusters

Superfamily	Periplasmic binding protein-like II
Functional Family	Porphobilinogen deaminase

Enzyme Information

2.5.1.61

Hydroxymethylbilane synthase.

based on mapping to UniProt P06983

4 porphobilinogen + H(2)O = hydroxymethylbilane + 4 NH(3).

-!- The enzyme works by stepwise addition of pyrrolylmethyl groups until a hexapyrrole is present at the active center. -!- The terminal tetrapyrrole is then hydrolyzed to yield the product, leaving a cysteine-bound dipyrrole on which assembly continues. -!- In the presence of a second enzyme, EC 4.2.1.75, which is often called cosynthase, the product is cyclized to form uroporphyrinogen III. -!- If EC 4.2.1.75 is absent, the hydroxymethylbilane cyclizes spontaneously to form uroporphyrinogen I. -!- Formerly EC 4.3.1.8.

UniProtKB Entries (1)

P06983

HEM3_ECOLI

Escherichia coli K-12

Porphobilinogen deaminase

PDB Structure

PDB	2YPN
External Links	PDBSum Proteopedia
Method	X-RAY DIFFRACTION
Organism	Escherichia
Primary Citation	Accurate and highly complete synchrotron protein crystal Laue diffraction data using the ESRF CCD and the Daresbury Laue software Nieh, Y.P., Raftery, J., Weisgerber, S., Habash, J., Schotte, F., Ursby, T., Wulff, M., Haedener, A., Campbell, J.W., Hao, Q., Helliwell, J.R. J.Synchrotron Radiat.