Fab Antibody Functionality Research Service

Introduction of Fab Antibody Functionality Research ServiceFab

Fab fragment (antigen-binding fragment), also known as antigen-binding fragment, is a region of the antibody structure that can bind to the Antigen. It consists of a complete light chain (variable region and constant region) and a partial heavy chain structure (variable region and a constant region fragment), the light chain and the heavy chain are connected by a disulfide bond, the volume is small, and the molecular weight is 47-48 kDa.

Because Fab has both an antigen-binding region and a partial constant region, it not only has the same antibody-antigen affinity as single chain antibody (scFv), excellent tissue penetration, etc., but also has a more stable structure, which plays a huge role in clinical diagnosis and treatment.

Fab Antibody Characterization

Structurally, Fab consists of light chain variable domain (VL) and light chain constant region (VL). CL), the heavy chain variable domain (VH), and a heavy chain constant region 1 (CH1). The CH1 of the two FABs is connected with the CH2 of the crystalline fragment (Fc) of the antibody through the hinge region to form a full-length IgG antibody. Based on this structure, Fab fragments can also be obtained by enzyme-digestion of full-length antibodies.

Under the action of papain, human Immunoglobulin G(lgG) can be degraded into two Fab fragments and one Fc fragment. Under the action of pepsin, lgG can be degraded into an F(ab ')2 fragment and a pFc' fragment. The F(ab')2 fragment can be further reduced to form two Fab' fragments.

Alpha Lifetech Can Provide

Alpha Lifetech's Fab antibody functional research service integrates the core technologies of gene cloning, protein expression, purification, screening, characterization, labeling and sequencing. Using advanced molecular biology and immunology techniques, Fab antibodies are efficiently expressed, precisely screened and comprehensively characterized to assess their functionality. Fab antibody expression vectors are constructed by genetic engineering means, and Fab fragments are produced on a large scale using efficient expression systems; subsequently, purification techniques such as affinity chromatography and ion-exchange chromatography are used to obtain high-purity Fab antibodies; furthermore, the affinity, specificity and biological activity of Fab antibodies are assessed by high-precision screening and characterization platforms such as surface plasmon resonance (SPR) and flow cytometry (FACS) Finally, antibody labeling and sequencing services are performed according to customer needs, providing strong support for subsequent research or application.

Fab Antibody Functional Research Service

In terms of Fab antibody functional research services, Alpha Lifetech provides customers with one-stop solutions from antibody design, screening, characterization, to production, labeling and sequencing based on our profound industry accumulation and continuous technological innovation, which help breakthroughs in scientific research and drug development. Our strengths include highly customized service solutions, efficient antibody screening platforms, precise antibody characterization technologies, and large-scale antibody production capabilities. Through integrated and automated workflows, we ensure that every step of the process meets the industry's highest standards, helping our clients quickly and accurately obtain Fab antibodies with specific functionalities, accelerating the research process and promoting the translation of research results.

Fab Antibody Functional Research Service Workflow

Steps	Specification	Timeline
Step1: Fab fragment acquisition/codon optimization and synthesis	Fab fragments were obtained by enzymatic digestion or chemical synthesis, and the Fab gene was amplified using PCR.	4 weeks
Step2: Recombinant plasmid construction	Recombinant construction of Fab gene in a suitable expression vector	2 days
Step3: Fab antibody expression	Mammalian Expression Systems E. coli Expression Expression System Rodent virus/insect cell protein expression Yeast Cell Expression Systems	2-3 weeks
Step4: Fab antibody purification	Protein purification by cation exchange chromatography, affinity chromatography such as IMAC and SEC; Fab antibody purification by protein A and G agarose columns	1 day
Step5: Fab function validation	Functional validation of expressed Fab by SDS-PAGE, Western Blot, ELISA, immunoprecipitation, flow cytometry, or immunohistochemistry	1 day