用氨基酸微环境注意力模型,高效预测蛋白设计中最佳氨基酸。
EMOCPD: Efficient Attention-based Models for Computational Protein Design Using Amino Acid Microenvironment
- 基于注意力机制捕捉稀疏蛋白结构中的关键特征。
- 在两个测试集上准确率达68.33%和62.32%,优于现有方法超10%。
- 适合设计负性氨基酸较少的蛋白,提升热稳定性和表达量。
计算蛋白设计(CPD)利用计算方法设计蛋白质。传统依赖能量函数和启发式算法的方法效率低,受限于能量函数与搜索算法,难以满足生物分子大数据时代的需求。现有深度学习方法受网络学习能力限制,无法有效提取稀疏蛋白结构中的信息,影响设计精度。为此,我们提出基于氨基酸微环境的高效注意力模型EMOCPD,通过分析氨基酸周围的三维原子环境,预测每个氨基酸的类别,并基于高概率候选氨基酸优化蛋白。EMOCPD采用多头注意力机制聚焦关键特征,结合反残差结构优化网络架构。在训练集上准确率超80%,在两个独立测试集上分别达到68.33%和62.32%,优于最优对比方法超过10%。在蛋白设计中,EMOCPD预测突变体的热稳定性与表达量显著优于野生型,验证了其设计优质蛋白的潜力。此外,预测结果受20种氨基酸组成影响,可分类为正向、负向或中性,研究发现EMOCPD更适用于负性氨基酸含量较低的蛋白设计。
原文摘要 · Abstract (English)
Computational protein design (CPD) refers to the use of computational methods to design proteins. Traditional methods relying on energy functions and heuristic algorithms for sequence design are inefficient and do not meet the demands of the big data era in biomolecules, with their accuracy limited by the energy functions and search algorithms. Existing deep learning methods are constrained by the learning capabilities of the networks, failing to extract effective information from sparse protein structures, which limits the accuracy of protein design. To address these shortcomings, we developed an Efficient attention-based Models for Computational Protein Design using amino acid microenvironment (EMOCPD). It aims to predict the category of each amino acid in a protein by analyzing the three-dimensional atomic environment surrounding the amino acids, and optimize the protein based on the predicted high-probability potential amino acid categories. EMOCPD employs a multi-head attention mechanism to focus on important features in the sparse protein microenvironment and utilizes an inverse residual structure to optimize the network architecture. The proposed EMOCPD achieves over 80% accuracy on the training set and 68.33% and 62.32% accuracy on two independent test sets, respectively, surpassing the best comparative methods by over 10%. In protein design, the thermal stability and protein expression of the predicted mutants from EMOCPD show significant improvements compared to the wild type, effectively validating EMOCPD's potential in designing superior proteins. Furthermore, the predictions of EMOCPD are influenced positively, negatively, or have minimal impact based on the content of the 20 amino acids, categorizing amino acids as positive, negative, or neutral. Research findings indicate that EMOCPD is more suitable for designing proteins with lower contents of negative amino acids.
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