针对Streptococcus pyogenes A类酶A的P1'含有Leu的标序列的独特结合模式导致了替代裂解
Brandon A Vogel1, Jadon M Blount1, Hanna M Kodama1
1Department of Chemistry, Western Washington University, 516 High St - MS9150 Bellingham WA 98225 USA antosj@wwu.edu amachej@wwu.edu +1-360-650-2826 +1-360-650-2271 +1-360-650-4397.
RSC chemical biology
|January 5, 2024
概括
格拉姆阳性细菌中的Sortase A (SrtA) 酶可以在标准LPXTG动机之外进行分裂. 这项研究揭示了Streptococcus pyogenes SrtA中的另一种结合方式,使新的蛋白质结合应用成为可能.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 排序酶可以将蛋白质在阳性细菌细胞表面上.
- 正规的排序酶识别动机是LPXTG,在P1 (Thr) 和P1' (Gly) 残留物之间发生裂变.
- 已经观察到LPXTG动机和替代裂变事件的变异,但潜在的机制仍然不清楚.
研究的目的:
- 阐明通过分类酶A (SrtA) 酶进行替代裂变的立体化学基础,特别是当P1'残留物是Leu或Phe时.
- 描述*Streptococcus pyogenes* SrtA (spySrtA) 中一种替代结合模式的结构和生化机制.
- 扩大蛋白质工程在类酶介导结合中的可能性.
主要方法:
- 蛋白质生物化学分析酶活性和分裂率.
- 结构生物学来确定spySrtA与特定基质的复杂结构.
- 计算生物化学,包括分子动力学模拟,以预测和分析结合模式.
主要成果:
- *Streptococcus pyogenes* SrtA对LPXTG序列具有P1'的标准/替代裂解比率类似于Leu,Phe或Tyr.
- 分子动力学模拟表明,Leu在P1'位置可以结合在正规的S1口袋中,改变基质构造.
- 对spySrtA-LPALA复合体的结构分析证实了Leu在S1口袋中的有利适应,支持了另一种绑定模式.
结论:
- 对spySrtA的一种新的替代结合模式已经在结构上得到了特征,解释了替代裂解事件.
- 这种替代的结合方式取决于P1'位置的特定残留物,例如Leu.
- 这些发现扩大了对蛋白质工程和生物技术应用的索尔塔酶介导结合的范围.
相关概念视频
Ligand Binding and Linkage
4.8K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
4.8K
Conservative Site-specific Recombination and Phase Variation
6.0K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.0K
Allosteric Proteins-ATCase
5.7K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
5.7K
Leaky Scanning
5.1K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.1K
Restriction Enzymes
30.7K
Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called restriction sites. Such palindromic DNA sequences or inverted repeats are commonly found in regions of functional significance, such as the origin of replication, gene operator sites, and regions containing transcription termination signals.
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
30.7K
Single-Strand DNA Binding Proteins
14.1K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
14.1K


