PDBsum entry 1lkb

Hydrolase

PDB id

1lkb

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Contents

			Protein chain

					240 a.a. *

			Ligands

					SO4 ×2

			Metals

					_NA


					_CL

			Waters ×288

* Residue conservation analysis

PDB id:

1lkb

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Name:

Hydrolase

Title:

Porcine pancreatic elastase/na-complex

Structure:

Elastase 1. Chain: a. Ec: 3.4.21.36

Source:

Sus scrofa. Pig. Organism_taxid: 9823

Resolution:

1.70Å

R-factor:

0.169

R-free:

0.203

Authors:

M.S.Weiss,S.Panjikar,E.Nowak,P.A.Tucker

Key ref:

M.S.Weiss et al. (2002). Metal binding to porcine pancreatic elastase: calcium or not calcium. Acta Crystallogr D Biol Crystallogr, 58, 1407-1412. PubMed id: 12198296 DOI: 10.1107/S0907444902010934

Date:

24-Apr-02

Release date:

28-Aug-02

PROCHECK

	Headers

	References

Protein chain

P00772 (CELA1_PIG) - Chymotrypsin-like elastase family member 1 from Sus scrofa

Seq: Struc:					266 a.a. 240 a.a.

Key:

PfamA domain

Secondary structure

CATH domain



		Enzyme reactions

Enzyme class:

E.C.3.4.21.36 - pancreatic elastase.

[IntEnz] [ExPASy] [KEGG] [BRENDA]

Reaction:

Hydrolysis of proteins, including elastin. Preferential cleavage: Ala-|-Xaa.

DOI no: 10.1107/S0907444902010934	Acta Crystallogr D Biol Crystallogr 58:1407-1412 (2002)
PubMed id: 12198296

Metal binding to porcine pancreatic elastase: calcium or not calcium.
M.S.Weiss, S.Panjikar, E.Nowak, P.A.Tucker.

ABSTRACT

Porcine pancreatic elastase has been crystallized at slightly acidic pH under two similar but slightly different conditions. Diffraction data were collected at a wavelength of 1.5 A to a maximum resolution of 1.7 A. Both difference electron-density maps and anomalous difference electron-density maps suggest that in crystals grown from a sodium sulfate solution PPE binds Na(+) in its metal-binding site. In contrast, PPE binds Ca(2+) in crystals grown from a solution containing sodium citrate and calcium chloride. This observation is in contradiction to most PPE structures reported in the PDB. In addition to the metal-binding site, up to three other binding sites, which appear to be anion-binding sites, could be identified based on the observed anomalous intensity differences.

Selected figure(s)



	Figure 2. Figure 2 The metal-binding site of PPE. The metal site is shown in red, the traces of loop 58-70 in grey and the atoms of the amino acids and water molecules coordinating the metal in dark blue (Na[2]SO[4] complex) and light blue (sodium citrate/CaCl[2] complex). The two structures were superimposed so that the metal coordinates are identical in both cases. This figure was also prepared using the programs MOLSCRIPT (Kraulis, 1991[Kraulis, P. J. (1991). J. Appl. Cryst. 24, 946-950.]) and Raster3D (Merritt & Bacon, 1997[Merritt, A. E. & Bacon, D. J. (1997). Methods Enzymol. 277, 505-524.]).

Figure was selected by an automated process.

Literature references that cite this PDB file's key reference

PubMed id

Reference

16843891

B.Kauffmann, M.S.Weiss, V.S.Lamzin, and A.Schmidt (2006).
How to avoid premature decay of your macromolecular crystal: a quick soak for long life.

Structure, 14, 1099-1105.

16820677

T.Kinoshita, A.Yamaguchi, and T.Tada (2006).
Tris(hydroxymethyl)aminomethane induces conformational change and crystal-packing contraction of porcine pancreatic elastase.

Acta Crystallogr Sect F Struct Biol Cryst Commun, 62, 623-626.

PDB codes:

2de8 2de9

The most recent references are shown first. Citation data come partly from CiteXplore and partly from an automated harvesting procedure. Note that this is likely to be only a partial list as not all journals are covered by either method. However, we are continually building up the citation data so more and more references will be included with time. Where a reference describes a PDB structure, the PDB codes are shown on the right.