Name: how bacteria survive with endospores
Uploaded: 2025-06-12T09:31:36.000Z
Duration: 1 min 20 s
Channel: JoVE

K12 Standards

Virginia  Standards of Learning

HIgh School

Biology

BIO.4

BIO.4.c

Endospores and Sporulation

내생포자는 휴면 상태이며 저항력이 강한 세포로, 일반적으로 그람 양성 박테리아에 의해 형성되어 극한의 열, 방사선, 극도의 건조 또는 독한 화학 물질의 존재와 같은 불리한 조건에서 살아남습니다. 내생포자 형성 또는 포자 형성은 환경 스트레스 요인 또는 영양 고갈에 의해 유발됩니다. 그것은 DNA 복제로 시작하여 비대칭 세포 분열로 이어지며, 이는 모세포에서 포자를 분리합니다. 포자(forespore)는 염색체(chromosome)와 세포질(cytoplasmic) 내용물과 함께 다량의 칼슘-디피콜린산(calcium-dipicolinic acid) 복합체를 함유하고 있습니다. 이 복합체는 내생포자를 탈수시킬 뿐만 아니라 열 손상으로부터 DNA를 안정화하고 보호하는 역할을 합니다. 그런 다음 모세포는 포자를 삼켜 그 주위에 이중 막을 형성합니다. 다음으로, 두꺼운 펩티도글리칸 층(peptidoglycan)층(피질)이 두 막 사이에 형성됩니다. 피질 주위에 보호 단백질 코팅이 추가되어 극한 조건에서 내생포자의 회복력을 향상시킵니다. 모세포는 성숙한 포자를 용해하여 환경으로 방출하여 조건이 개선될 때까지 휴면 상태를 유지할 수 있습니다.

내생포자와 포자형성

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&#45236;&#49373;&#54252;&#51088;&#45716; &#48148;&#49892;&#47084;&#49828;&#50752; &#53364;&#47196;&#49828;&#53944;&#47532;&#46356;&#50880;&#49549;&#51008; ...

Education

교육

JoVE Core

Microbiology

미생물학

Unit

단위

Microbial Cell Structure and Function        

미생물 세포의 구조와 기능

KEY TERMS AND CONCEPTS

주요 용어 및 개념

내생포자(endospores)와 포자형성(Sporulation)

how bacteria survive with endospores

Endospores help some bacteria survive harsh conditions. These dormant cells are made mainly by Gram-positive bacteria such as Bacillus and Clostridium. They are highly resistant to heat, ultraviolet and ionizing radiation, drying, and toxic chemicals. In rare cases, endospore-like structures have also been seen in some Gram-negative bacteria, including Coxiella burnetii and Sporosarcina ureae, as well as in other species exposed to extreme conditions.

Sporulation begins when bacteria face stress, such as a lack of nutrients or major temperature changes. The cell first copies its DNA. It then divides unevenly into a smaller forespore and a larger mother cell. The forespore holds the bacterial chromosome and other key cell contents. During this stage, calcium-dipicolinic acid, or Ca-DPA, builds up inside the forespore. Ca-DPA helps dry out the endospore, strengthen its structure, and protect DNA from heat and chemical damage.

Next, the mother cell engulfs the forespore and forms a double membrane around it. A thick peptidoglycan layer called the cortex is added between these membranes. The cortex helps keep the core dehydrated and lowers enzyme and metabolic activity, which supports long dormancy. Around the cortex, the cell builds a tough protein coat. This coat adds strength and helps resist enzymes and UV radiation.

When the endospore is fully formed, the mother cell breaks apart in a programmed way and releases it. The mature endospore can remain viable for thousands of years. When conditions improve, it germinates and returns to its vegetative bacterial form. In that state, it can grow and reproduce again. This survival strategy helps spore-forming bacteria live in many extreme habitats.

How Bacteria Survive with Endospores

prokaryotic vs. eukaryotic cells

Cell Organization in Prokaryotes and Eukaryotes

Prokaryotic and eukaryotic cells show two major patterns of cell organization. These differences shape the structure, size, and function of living things across the domains of life. Prokaryotic cells, such as bacteria and archaea, are simple in structure. They do not have a nucleus or other membrane-bound organelles. Their DNA is usually a single circular molecule found in the nucleoid region, which is not surrounded by a nuclear membrane. Prokaryotes are usually very small, about 0.1 to 5.0...

microbial morphologies 

Microbial Shapes and Cell Forms

Microbial shapes and cell forms help bacteria, archaea, and eukaryotic microbes survive in many environments. Cell shape affects how these organisms grow, take up nutrients, and handle waste. It also reflects the link between structure and function. Among bacteria, cocci and bacilli are the most common shapes. Cocci are spherical cells, and they may appear alone or in pairs called diplococci, chains called streptococci, clusters called staphylococci, or groups of four called tetrads. Bacilli...

bacterial cell wall 

Gram-Positive and Gram-Negative Walls

Bacterial cell walls give bacteria their shape and help protect them from osmotic stress. This rigid but flexible layer surrounds the plasma membrane and supports cellular integrity. Its main building block is peptidoglycan, a mesh-like polymer that adds strength while still allowing some flexibility. Peptidoglycan is made of alternating N-acetylglucosamine, or NAG, and N-acetylmuramic acid, or NAM. Short amino acid chains connect these sugar units and help form the strong network. The...

archaeal cell wall

Archaeal Cell Wall Types and Functions

Archaeal cell walls protect archaea and help them survive in extreme environments. Unlike bacterial cell walls, they do not have the peptidoglycan layer found in most bacteria. Instead, archaea use a range of materials, including proteins, polysaccharides, and pseudomurein, to build their outer layer. The most common archaeal cell wall is the S-layer, or surface layer. It is made of tightly packed protein or glycoprotein units that form a crystalline lattice. These repeating patterns can make...

peptidoglycan synthesis

Building the Bacterial Cell Wall

Peptidoglycan builds the bacterial cell wall and gives the cell its shape and strength. It is a mesh-like polymer around the bacterial plasma membrane. The polymer is made of repeating sugar units, N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM), linked by β-1,4 glycosidic bonds. Short peptide chains cross-link the sugar chains and make the wall more rigid. Peptidoglycan biosynthesis starts in the cytoplasm with soluble precursors. Uridine diphosphate, or UDP, binds to NAG and NAM to...

plasma membrane in bacteria and archaea

Bacterial vs Archaeal Membrane Lipids

Bacterial and archaeal plasma membranes control what enters and leaves the cell. They also help maintain cell integrity. Although both membranes do the same basic job, their structures are different because bacteria and archaea face different environmental demands. Bacterial plasma membranes are mainly made of phospholipids. These lipids have fatty acid chains linked to a glycerol backbone by ester bonds. They form a bilayer, with hydrophilic glycerol-phosphate heads facing outward and...

outer layers of the cell envelope

Capsules, Slime Layers, and S-Layers

Capsules, slime layers, and S-layers are outer coverings on prokaryotic cells. These layers help bacteria and archaea survive, attach to surfaces, and interact with their environment. They are often made of polysaccharides, polypeptides, proteins, or glycoproteins. Capsules are tightly bound and highly organized layers that stick firmly to the bacterial cell wall. They are usually made of polysaccharides, although some are made of polypeptides. A capsule protects cells from dehydration and can...

flagella and motility in bacteria

Bacterial Flagella as Tiny Rotary Motors

Bacterial flagella are thread-like structures that help cells move and respond to their surroundings. They extend from the cell envelope and support both motility and chemotaxis, which is the ability to move in response to chemical signals. Their design shows how bacteria use specialized structures to survive in different environments. A flagellum has three main parts: the filament, the hook, and the basal body. The filament is the long, helical part made of repeating flagellin protein...

fimbriae, pili, and axial filaments

How Bacteria Stick, Share Genes, and Move

Fimbriae, pili, and axial filaments are bacterial surface structures that help cells attach, exchange genes, and move. These hairlike appendages are made mainly of pilin protein. They support bacterial survival in different environments and can also increase pathogenicity. Fimbriae are fine, filament-like structures that are densely packed on the bacterial surface. They are about 2 to 10 nanometers wide and help bacteria attach to nonliving surfaces and to host tissues. This adhesion is an...

cell inclusions

Prokaryotic Cell Storage Inclusions

Prokaryotic cell storage inclusions help bacteria store nutrients, manage energy, and adapt to changing environments. These inclusions let cells survive when food, phosphate, sulfur, light, or oxygen levels change. They are important examples of how simple cells can still have highly specialized structures. Some inclusions store carbon. Poly-β-hydroxybutyric acid, or PHB, forms granules that act as a long-term carbon and energy reserve. Glycogen granules also store carbon, but they provide a...

endospores and sporulation

Endospores help some bacteria survive harsh conditions. These dormant cells are made mainly by Gram-positive bacteria such as Bacillus and Clostridium. They are highly resistant to heat, ultraviolet and ionizing radiation, drying, and toxic chemicals. In rare cases, endospore-like structures have also been seen in some Gram-negative bacteria, including Coxiella burnetii and Sporosarcina ureae, as well as in other species exposed to extreme conditions. Sporulation begins when bacteria face...

nucleoid

How Prokaryotes Organize DNA

Prokaryotes organize their DNA in the nucleoid, a distinct region where genetic material and associated proteins are packed. Because prokaryotic cells do not have a membrane-bound nucleus, the nucleoid helps keep DNA organized and available for cell activities. In most bacteria and archaea, the DNA is a single, circular, double-stranded molecule that is tightly compacted by supercoiling and protein interactions. Nucleoid-associated proteins, or NAPs, help shape and maintain this DNA region.

surface appendages of archaea

Archaeal Pili and Archaella in Action

Archaeal pili and archaella help archaea survive, attach, and move in challenging environments. These surface appendages support adhesion, biofilm formation, and motility. They give archaeal cells key advantages in habitats that can be extreme. Pili are filament-like structures made from pilin protein subunits. Their main role is adhesion, which means helping cells stick to surfaces. They also support biofilm formation, where cells live in a shared, surface-attached community. Some pili are...

key terms and concepts

Learn how Bacillus and Clostridium form endospores through sporulation, why Ca-DPA and protective layers matter, and how spores germinate again.

How Bacteria Survive with Endospores | JoVE K12

JoVE Core Microbiology provides an engaging introduction to the microbial world and its influence on health, industry, and the environment. This comprehensive collection covers key concepts such as microbial structure, metabolism, genetics, and ecology. It introduces essential laboratory techniques and microscopy methods through visually engaging animations. Corresponding scientist-in-action videos bridge classroom concepts with real-world research and applications.

microbiology

new-york-state-science-learning-standards

New York State Science Learning Standards

Middle School

Earth and Space Sciences

History of Earth

MS-ESS2-1

Tennessee Academic Standards

Earth's Systems

A. Earth Materials and Systems

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Bacterial Growth Curve

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Microbial Morphologies 

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Bacterial Cell Wall 

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Archaeal Cell Wall

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Peptidoglycan Synthesis

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Plasma Membrane in Bacteria and Archaea

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Outer Layers of the Cell Envelope

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Flagella and Motility in Bacteria

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Fimbriae, Pili, and Axial Filaments

Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of ...

Cell Inclusions

Prokaryotic cells possess a variety of inclusions that play crucial roles in nutrient storage, metabolic processes, and environmental adaptation. These ...

Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme ...

Nucleoid

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Surface Appendages of Archaea

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Types of Microorganisms

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BIO.4.d

History of Microbiology

Microbiology, a scientific field dedicated to the study of microorganisms, has undergone profound development since its inception in the 17th century. Its ...

Infection

When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. ...

Defense Mechanism Against Infection

Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal ...

The student will investigate and understand that bacteria and viruses have an effect on living systems. Key ideas include  the germ theory of infectious disease is supported by evidence.

BIO.4.e

How Bacteria Survive with Endospores

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