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Sentences for "carbonyl "
According to this model, all 5-HT 3 R antagonists contain an aromatic ring, a carbonyl oxygen or bioisosteric equivalent, and a basic nitrogen.
The carbonyl oxygen and the aromatic ring are coplanar and separated by a distance of 3.
While Lerisetron contains no carbonyl group, the second nitrogen contained in the benzimidazole heterocycle could act as bioisostere of this functional group [ 22 ] .
Spencer and coworkers postulated that Tyr228 is part of an oxyanion hole that interacts with the ß-lactam carbonyl on substrate and helps to stabilize the putative tetrahedral intermediate formed during substrate turnover [ 37 ] .
In the modeling studies on CcrA [ 42 ] , Asn233 was predicted to interact with the ß-lactam carbonyl on substrate, and mutagenesis studies have supported this prediction [ 43 ] .
Although Asn233 is sequence conserved in L1 [ 35 ] , it is located 14Å away from the modeled position of the ß-lactam carbonyl and was predicted not to play a role in substrate binding to L1 [ 37 ] .
On the other hand, the substrate-binding model predicted that Tyr228 was in position to offer a hydrogen bond to the ß-lactam carbonyl and participate in an oxyanion hole that was proposed to form as the substrate was hydrolyzed [ 37 ] .
In fact, the main chain carbonyl of residue 59 appears to be H-bonded to the exocyclic amino group (N6) of A-4 in subunit A.
Less strong Lewis bases are the charge-compensated Glu in an ion-pair with Arg, the amide group of Gln and Asn, and finally the carbonyl of the peptide backbone as the weakest [ 29 ] .
Alternatively, these Chls may coordinate with peptide carbonyl groups.
Lhcb6, a minor LHCP, contains Gly instead of Pro at the position analogous to 82 in Lhcb1, thus eliminating the peptide bond carbonyl of Gly as a ligand, but Lhcb6 has a potential ligand for Chl b in Gln83 [ 39 40 ] .
However, Lhcb2, Lhcb3, Lhca1, Lhca2 and Lhca3 contain the Gly peptide carbonyl as a ligand (each has Pro at 'position 82' [ 40 ] ) but are reduced only slightly, if any, in amount by the lack of Chl b.
The carbonyl oxygen of acetylcholine and backbone nitrogen of Leul46 are also engaged in a hydrogen bond.
The protonated ammonium nitrogen is also making polar interaction with the delocalized electron and backbone carbonyl of Trp182, and is less than 1A away from the quaternary nitrogen of docked acetylcholine.
3) It displays an amide group that occupies a cavity not filled by nicotine or acetylcholine, and makes a network of hydrogen bonds with the indole nitrogen of alpha4-Trp182, the backbone carbonyl of beta2-Ser133 and beta2-Phe144, and with the backbone nitrogen of beta2-Leu146 (Figure 5B).
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