BETA-LACTAMASE OF BACILLUS-LICHENIFORMIS 749/C AT 2 A RESOLUTION

被引:190
作者
MOEWS, PC
KNOX, JR
DIDEBERG, O
CHARLIER, P
FRERE, JM
机构
[1] UNIV CONNECTICUT, DEPT MOLEC & CELL BIOL, 75 N EAGLEVILLE RD, STORRS, CT 06269 USA
[2] STATE UNIV LIEGE, INST PHYS, DEPT CRYSTALLOG, B-4000 LIEGE, BELGIUM
[3] STATE UNIV LIEGE, INST CHEM, DEPT ENZYMOL, B-4000 LIEGE, BELGIUM
关键词
penicillin antibiotics; penicillinase; penicillin‐binding protein; protein structure prediction; X‐ray diffraction; β‐lactamase;
D O I
10.1002/prot.340070205
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Two crystal (A and B) of the 29,500 Da Class A β‐lactamase (penicillinase) from Bacillus licheniformis 749/C have been examined crystallographically. The structure of B‐form crystals has been solved to 2 Å resolution, the starting model for which was a 3.5 Å structure obtained from A‐form crystals. The β‐lactamase has an α + β structure with 11 helices and 5 β‐strands seen also in a peinicilin target DD‐peptidase of Streptomyces R61.1 Atomic parameters of the two molecules in the asymmetric unit were refined by simulated annealing at 2.0 Å resolution. The R factor is 0.208 for the 27,330 data greater than 3 (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 conversed 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 β‐lactam substrates is facilitated by interactions with Lys‐234, Tyhr‐235, and Ala‐237 in a conserved β‐strand peptide, which is antiparallel to the β‐lactam's acylamido linkage; an exposed cavity near Asn‐170 exits for acylamido Substituent. The reactive double bond of clavulanate‐type inhibitors may interact with Arg‐244 on the fourth β‐strand. A very similar binding site architecture is seen in the DD‐peptidase. Copyright © 1990 Wiley‐Liss, Inc.
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页码:156 / 171
页数:16
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