BIOLOVER

The Mystery of Gel Bands: Ghost Bands Without DNA? (Solving Loading Dye & Protein Artifacts) The Mystery of Gel Bands: Ghost Bands Without DNA? (Solving Loading Dye & Protein Artifacts) Have you ever scratched your head while checking your gel electrophoresis results? You look at a sample where you expect no DNA, yet a mysterious band that looks exactly like DNA appears, leaving you confused. "Is it contamination?" "Did I make the gel wrong?" Countless worries might cross your mind. But don't panic. This phenomenon is more common than you think, and the culprit is often closer than you expect. It is highly likely caused by the unfortunate meeting of your habitual Loading Dye and residual proteins in your sample. Based on discussions with our experts, today we will clearly explain why these Artifacts (Ghost Bands) occur and how you can achieve clean r...

Bacteriophage M13: A Complete Analysis of the Key Tool in Phage Display Bacteriophage M13 Hello, dear readers of the biotechnology blog! Today, let's embark on a journey into the fascinating world of microbiology. We'll explore tiny, invisible entities that profoundly impact our lives: viruses. More specifically, we'll delve into bacteriophages , the special viruses that infect and replicate only within bacteria . Our focus will be on a particular friend, the M13 phage , and how it's become a pivotal tool in cutting-edge biotechnology known as phage display . Aren't you curious? How did this minuscule entity come to shine in diverse fields, from disease treatment to drug discovery? Join me now as we dive deep into the world of bacteriophages! What Are Bacteriophages and How Diverse Are They? Bacteriophages , often shortened to phages , are viruses that exclusively infect and replicate within bacteria . They...

TEV Protease 처리와 Ni Spin Column 정제 가이드 MBP-tag 단백질 정제 를 할 때 많은 연구자들이 선택하는 시스템이 바로 pMAL-c6T 벡터 입니다. 이 시스템을 활용하면 MBP-tag와 표적 단백질을 효율적으로 분리할 수 있고, 특히 TEV protease를 이용한 절단 과정 과 이후 Ni Spin Column을 통한 분리 단계 는 높은 순도의 단백질을 확보하는 데 매우 중요합니다. 이번 포스트에서는 TEV 처리 후 정제 단계별로 버퍼 교환이 필요한지 여부 , 단백질 손실의 원인 , 그리고 실험 중 확인 방법(SDS-PAGE) 까지 꼼꼼히 안내드릴게요. TEV protease 처리 시 버퍼 교환은 필요할까? 많은 분들이 궁금해하시는 것 중 하나는, amylose resin에서 elution한 단백질 용액에 TEV protease를 처리하기 전 버퍼 교환이 필요한지 입니다. 정답은 NO! Amylose 컬럼의 elution buffer는 TEV protease의 반응 버퍼와 매우 유사 하기 때문에, 10X TEV buffer를 따로 첨가하지 않고도 바로 반응시킬 수 있습니다. 또한 TEV 반응물 자체를 Ni Spin Column에 그대로 로딩 해도 무방합니다. 단백질 구조와 정제 흐름 요약 pMAL-c6T 벡터를 사용하는 경우 단백질 구성은 다음과 같습니다: HHHHHH-MBP-linker (TEV protease 절단 서열 포함)-표적 단백질 이 구조의 단백질을 amylose resin에서 정제한 후 , His-tag를 갖는 TEV protease로 처리 하면 다음과 같은 결과물이 생성됩니다: HHHHHH-MBP-linker (절단 서열 포함) 표적 단백질 이 혼합물을 Ni Spin Column에 로딩하면: His-tag를 가진 TEV protease와 MBP-linker 는 Ni resin에 결합 표적 단백질은 flow-through로 분리 ...

A Comprehensive Guide to Protein Quantitation Methods for Biopharmaceuticals A Comprehensive Guide to Protein Quantitation Methods In biopharmaceutical development, accurate protein quantitation is not just a routine step—it’s a fundamental requirement for assessing potency, purity, and stability. However, the choice of assay method can dramatically affect the reliability of your results, especially when dealing with chemically modified proteins such as PEGylated or glycosylated forms. Why Protein Quantitation Accuracy Matters According to ICH guidelines, protein quantitation directly influences structural characterization (like CD spectra), bioactivity measurement, and release criteria. Misjudged concentrations may lead to misinterpretation of assays or complete batch failures. Comparison of Six Major Protein Quantitation Assays Assay Principle ...

Phage Display Insert-Less Clones: Understanding Their Role in Biopanning and Library Construction Understanding Their Role in Biopanning and Library Construction Introduction: "What if 70% of your clones after three rounds of biopanning turned out to be empty vectors ?" A researcher working with a Ph.D.-7 peptide library encountered this shocking reality. Despite careful panning against their target protein, sequencing revealed most clones contained just the bare M13KE backbone - no insert at all. This wasn't an experimental error, but rather a common yet often overlooked phenomenon in phage display: insert-less clones . The Hidden Artifact in Phage Display If you've ever worked with phage display libraries , you've probably encountered insert-less clones —those pesky, empty vectors that sneak into your experiments like uninvited guests. These clones, often th...