Erwinia herbicola 细菌菌株产生的抗生素可有效控制梨火疫病菌,这是导致植物病火疫病的细菌病原体。Pantocin B 是第一个被表征的抗生素,据报道可以灵活地合成各种类似物。嵌在 pantocin B 的“伪三肽”骨架中的是亚甲二胺和甲基砜,这两种在天然产物中都具有不同寻常的结构特征。pantocin B 的肽性质促进了一系列构效关系研究,这些研究探索了这些官能团在决定 pantocin B 生物活性方面的作用。 明确区分抗生素 N 端和 C 端部分之间的作用作为构效关系研究的结果确定。N-末端 L-丙氨酰基是细胞输入所必需的,但与细胞内靶标(精氨酸生物合成酶 N-乙酰鸟氨酸氨基转移酶)相互作用时则不需要。发现亚甲二胺和甲基砜部分对抗生素活性至关重要,这可能是由于与 N-乙酰鸟氨酸氨基转移酶的广泛相互作用。
Glycosylation of the primary binding pocket of a subtilisin protease causes a remarkable broadening in stereospecificity in peptide synthesis
作者:Kazutsugu Matsumoto、Benjamin G. Davis、J. Bryan Jones
DOI:10.1039/b010021h
日期:——
Site-selective glycosylation at position 166 at the base of
the primary specificity S1 pocket in the serine protease
subtilisin Bacillus lentus (SBL) created glycoproteins that are
capable of catalyzing the coupling reactions of not only L-
amino acid esters but also D-amino acid esters to give the
corresponding dipeptides in good yields as a result of greatly broadened
substrate specificities that can be rationalized by the interaction of the
glycans acting as chiral auxiliaries in stereochemically mismatched
pairs.
Expanded structural and stereospecificity in peptide synthesis with chemically modified mutants of subtilisin
作者:Kanjai Khumtaveeporn、Grace DeSantis、J.Bryan Jones
DOI:10.1016/s0957-4166(99)00255-4
日期:1999.7
Employing the strategy of combined site directed mutagenesis and chemicalmodification, we previously generated chemically modified mutantenzymes (CMMs) of subtilisinBacilluslentus (SBL). We now report the use of these SBL-CMMs for peptide coupling reactions. The SBL-CMMs exhibit dramatically altered substrate specificity, including the acceptance of d-amino acid acyl donors, generating dipeptides
Modified enzymes and their use for peptide synthesis
申请人:——
公开号:US20020137177A1
公开(公告)日:2002-09-26
The present invention relates to modified enzymes with one or more amino acid residues from an enzyme being replaced by cysteine residues, where at least some of the cysteine residues are modified by replacing thiol hydrogen in the cysteine residue with a thiol side chain to form a modified enzyme, wherein the modified enzyme has high esterase and low amidase activity. Also, a method of producing the modified enzymes is provided. The present invention also relates to a method for using the modified enzymes in peptide synthesis.
Synthesis and Biological Evaluation of Analogues of the Antibiotic Pantocin B
作者:Amanda E. Sutton、Jon Clardy
DOI:10.1021/ja003770j
日期:2001.10.1
Strains of the bacteria Erwinia herbicola produce antibiotics that effectively control E. amylovora, the bacterial pathogen responsible for the plant disease fire blight. Pantocin B was the first of these antibiotics to be characterized, and a flexible synthesis of various analogues is reported. Embedded in the "pseudo-tripeptide" backbone of pantocin B are a methylenediamine and a methyl sulfone, both
Erwinia herbicola 细菌菌株产生的抗生素可有效控制梨火疫病菌,这是导致植物病火疫病的细菌病原体。Pantocin B 是第一个被表征的抗生素,据报道可以灵活地合成各种类似物。嵌在 pantocin B 的“伪三肽”骨架中的是亚甲二胺和甲基砜,这两种在天然产物中都具有不同寻常的结构特征。pantocin B 的肽性质促进了一系列构效关系研究,这些研究探索了这些官能团在决定 pantocin B 生物活性方面的作用。 明确区分抗生素 N 端和 C 端部分之间的作用作为构效关系研究的结果确定。N-末端 L-丙氨酰基是细胞输入所必需的,但与细胞内靶标(精氨酸生物合成酶 N-乙酰鸟氨酸氨基转移酶)相互作用时则不需要。发现亚甲二胺和甲基砜部分对抗生素活性至关重要,这可能是由于与 N-乙酰鸟氨酸氨基转移酶的广泛相互作用。
Chemically Modified “Polar Patch” Mutants of Subtilisin in Peptide Synthesis with Remarkably Broad Substrate Acceptance: Designing Combinatorial Biocatalysts
作者:Kazutsugu Matsumoto、Benjamin G. Davis、J. Bryan Jones
L-amino acid esters but also D-amino acid esters as acyl donors with glycinamide to give the corresponding dipeptides in good yields. These powerful enzymes are also applicable to the coupling of L-amino acid acyl donors with alpha-branched acyl acceptor, L-alaninamide. Typical increases in isolated yields of dipeptides of 60-80 % over SBL-WT (e.g. 0 % yield of Z-D-Glu-GlyNH(2) using SBL-WT-->74 % using