Article (Scientific journals)
Beta-lactamase of Bacillus licheniformis 749/C at 2 A resolution.
Moews, P. C.; Knox, J. R.; Dideberg, O. et al.
1990In Proteins, 7 (2), p. 156-71
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Keywords :
Bacillus/enzymology/genetics; Bacterial Proteins/genetics/metabolism; Binding Sites; Models, Molecular; Penicillinase/genetics/metabolism; Penicillins/metabolism; Protein Binding; Protein Conformation; X-Ray Diffraction
Abstract :
[en] Two crystal forms (A and B) of the 29,500 Da Class A beta-lactamase (penicillinase) from Bacillus licheniformis 749/C have been examined crystallographically. The structure of B-form crystals has been solved to 2 A resolution, the starting model for which was a 3.5 A structure obtained from A-form crystals. The beta-lactamase has an alpha + beta structure with 11 helices and 5 beta-strands seen also in a penicillin target DD-peptidase of Streptomyces R61. Atomic parameters of the two molecules in the asymmetric unit were refined by simulated annealing at 2.0 A resolution. The R factor is 0.208 for the 27,330 data greater than 3 sigma (F), with water molecules excluded from the model. The catalytic Ser-70 is at the N-terminus of a helix and is within hydrogen bonding distance of conserved Lys-73. Also interacting with the Lys-73 are Asn-132 and the conserved Glu-166, which is on a potentially flexible helix-containing loop. The structure suggests the binding of beta-lactam substrates is facilitated by interactions with Lys-234, Thr-235, and Ala-237 in a conserved beta-strand peptide, which is antiparallel to the beta-lactam's acylamido linkage; an exposed cavity near Asn-170 exists for acylamido substituents. The reactive double bond of clavulanate-type inhibitors may interact with Arg-244 on the fourth beta-strand. A very similar binding site architecture is seen in the DD-peptidase.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Moews, P. C.
Knox, J. R.
Dideberg, O.
Charlier, Paulette ;  Université de Liège - ULiège > Département des sciences de la vie > Cristallographie des macromolécules biologiques
Frère, Jean-Marie ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Language :
English
Title :
Beta-lactamase of Bacillus licheniformis 749/C at 2 A resolution.
Publication date :
1990
Journal title :
Proteins
ISSN :
0887-3585
eISSN :
1097-0134
Publisher :
Wiley Liss, Inc., New York, United States - New York
Volume :
7
Issue :
2
Pages :
156-71
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 November 2010

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