CD5ligand The CD5 signal peptide sequence is a crucial element in the proper functioning and localization of the CD5 protein, a key regulator of T-cell receptor (TCR) signaling. This protein, also known as T-cell surface glycoprotein CD5, plays a significant role in cellular development and immune responses. Understanding the sequence of its signal peptide is fundamental for comprehending how CD5 is synthesized, processed, and directed to its functional location on the cell surface作者：G Voisinne·2018·被引用次数：129—Here we focus onCD5, a transmembrane receptor that regulates T cell functions and development but remains poorly characterized at the molecular level..
CD5 is a type-I transmembrane protein belonging to the scavenger receptor cysteine-rich (SRCR) superfamily. It is primarily expressed on the surface of T cells and plays a negative regulatory role in TCR signaling during thymocyte development.Description. A recombinant protein antigen with a N-terminal His6-ABP tag corresponding to humanCD5. Source: E. coli. The protein's structure typically includes an extracellular region with SRCR domains, a transmembrane region, and a cytoplasmic tail.
The signal peptide, often referred to as a leader peptide, is a short sequence of amino acids typically found at the N-terminus of a protein destined for secretion or insertion into cellular membranes. Its primary function is to direct the nascent polypeptide chain to the endoplasmic reticulum (ER) during translation.(B) Protein structure of the CD5 receptor.SP, signal peptide; EC, extracellular region; D1-D2-D3, EC SRCR domains; TM, transmembrane region; and CY, ... Within the ER, the signal peptide is usually cleaved off by a signal peptidase. The presence and specific sequence of the CD5 signal peptide are therefore critical for its correct translocation and subsequent function as a cell surface receptor.
While specific, universally agreed-upon sequences for the CD5 signal peptide can vary slightly depending on the source and species, general characteristics are well-established作者：王幸·2019·被引用次数：1—为探索其生物学功能,需要制备重组NS1蛋白。本研究采用人(Homo sapiens)CD5信号肽序列介导NS1蛋白在真核细胞中进行分泌表达,以制备高纯度的NS1重组蛋白。. Research into CD5 sequences reveals that the precursor molecule, deduced from cDNA clones, contains a classic signal peptide. This peptide is generally rich in hydrophobic amino acids, a common feature that facilitates its interaction with the ER membrane. For instance, analyses of the human CD5 gene indicate that the CD5 signal peptide sequence can contain multiple potential initiation codons, such as ATG, TTG, and CTG, highlighting the complexity of its precise start site determination and processing.
Studies have also identified that mature human CD5 consists of an extracellular domain (ECD) of approximately 348 amino acids, preceded by this signal peptide. Similarly, the mouse CD5 protein has an extracellular domain of around 347 amino acids.Summary ofCD5(LEU1, T1) expression in human tissue. Highly selective membranous expression in immune cells. The signal peptides themselves are typically short, often around 19-26 amino acids in length, and are usually underlined in sequence alignments to denote their presence.
The precise sequence of the CD5 signal peptide influences not only the protein's localization but also its downstream signaling capabilities. CD5 associates with various signaling proteins, including LCK and the CD3 zeta (CD3Z) chain, to regulate TCR signaling.Gene and protein structure of the human CD5 receptor. (A) ... Disruptions or variations in the signal peptide sequence could potentially affect these interactions, leading to altered T-cell responses.
Furthermore, the CD5 protein itself is involved in regulating T-cell proliferation and developmentRecombinant Human CD5 Protein, CF (1636-CD). Its interactions with other molecules, such as CD72/LYB-2 and PTPN6/SHP-1, underscore its multifaceted roles in immune regulation. The proper synthesis and transport facilitated by the signal peptide are the initial steps in these complex processes.CD5 (protein)
While the core function of the CD5 signal peptide is conserved, variations can exist across different speciesSignal peptides are underlined. Identical amino acid residues are indicated by asterisks. The cysteine residues are numbered according to their position in the .... Databases and research papers provide sequence information for CD5 proteins from humans, mice, and rats, often detailing protein length, molecular weight, and specific sequence featuresTissue expression of CD5 - Summary. For example, the Signal Peptide Database and NCBI Gene resources offer curated sequences and related genetic information.
Beyond the signal peptide, other relevant sequences and domains are crucial to CD5's function.Multiple alignment of selected vertebrate CD5 amino acid ... These include the extracellular scavenger receptor cysteine-rich (SRCR) domains, the transmembrane region, and the cytoplasmic domain. Understanding these different parts of the CD5 molecule provides a comprehensive view of its structure-function relationship. Researchers may also investigate homologous 11-mer amino acid sequences within the SRCR domains for specific functional studies, as seen in some analyses of tandem peptides from human CD5.
In conclusion, the CD5 signal peptide sequence is a foundational element for the CD5 protein's journey from synthesis to its critical role in T-cell signaling and immune regulationGene - CD5 CD5 molecule [Homo sapiens (human)] - NCBI. Its precise sequence and processing are essential for directing the protein to the cell surface, enabling its complex interactions and contributing to the fine-tuning of immune responses作者：G Mourglia-Ettlin·2024·被引用次数：1—The CD5-T peptide was designed based onhomologous 11-mer amino acid sequencespresent in each of the three SCRC extracellular domains of CD5 (see Figure 1A)..
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