Name: prokaryotic cell storage inclusions
Uploaded: 2025-06-12T09:31:19.000Z
Duration: 1 min 27 s
Channel: JoVE

K12 Standards

Virginia  Standards of Learning

HIgh School

Biology

BIO.4

BIO.4.c

Cell Inclusions

İnklüzyonlar, besinler, metabolik yan ürünler veya diğer bileşikler için depolama alanları olarak hizmet eden hücre içi yapılardır.Fazla karbon genellikle lipid polimerlerinden veya glikojen granüllerinden oluşan poli-β-hidroksibütirik asit granülleri olarak depolanır. Bu depolama şekilleri, gerektiğinde karbon rezervuarları ve hızlı enerji kaynakları olarak işlev görür.Metakromatik granüller veya volutin, Corynebacterium'da yaygın olarak bulunan polifosfat granüllerdir. Bu granüller, nükleik asit ve ATP sentezi için inorganik fosfat depolar.Thiobacillus gibi kükürt oksitleyici bakteriler için bir enerji rezervi olan kükürt kürecikleri, elementel kükürt depolar.Bazı siyanobakteriler, karbondioksit fiksasyonunu kolaylaştıran RuBisCO gibi enzimler içeren karboksizomlar üretir.Gaz vakuolleri, suda yaşayan bakteri ve arkelerin kaldırma kuvvetini korumasını sağlayan, ışığa ve besin maddelerine erişimi optimize eden hava dolu içi boş yapılardır.Manyetit veya greigitten oluşan manyetozomlar, Magnetospirillum magnetotactic gibi bakterilerde bulunur. Sudaki bakterileri Dünya'nın manyetik alanıyla hizalarlar ve onları düşük oksijen konsantrasyonlarına sahip anaerobik bölgelere doğru yönlendirirler.

hücre İnküzyonları

Prokaryot h&#252;creler, besin depolama, metabolik s&#252;re&#231;ler ve &#231;evresel adaptasyon a&#231;&#305;s&#305;ndan kritik i&#351;levlere sahip &#231;e&#351;itli inkl&#252;zyonlara sahiptir. Bu yap&#305;lar, bakterilerin de&#287;i&#351;ken &#231;evresel ko&#351;ullarda hayatta kalmas&#305;n&#305; sa&#287;lamak i&#231;in temel kaynaklar&#305; depolamalar&#305;na ve metabolik verimliliklerini optimize etmelerine olanak tan&#305;r.
Karbon Depolama: Poli-&#946;-Hidroksib&#252;tirik Asit ve Glikojen Gran&#252;lleri
Bakteriler, fazla karbonu s&#305;kl&#305;kla &#246;zel gran&#252;llerde depolar. Poli-&#946;-hidroksib&#252;tirik asit (PHB) gran&#252;lleri, uzun vadeli karbon ve enerji rezervi olarak i&#351;lev g&#246;ren lipit polimerlerdir. Bu gran&#252;ller, besin k&#305;tl&#305;&#287;&#305; s&#305;ras&#305;nda bakterilerin metabolize edebilece&#287;i bir enerji kayna&#287;&#305; sa&#287;lar. Ayr&#305;ca, y&#252;ksek derecede dallanm&#305;&#351; glikojen polimerlerinden olu&#351;an glikojen gran&#252;lleri, h&#305;zl&#305; bir enerji kayna&#287;&#305; sunar. Glikojenin dallanm&#305;&#351; yap&#305;s&#305;, enzimatik eri&#351;imi verimli hale getirerek ihtiya&#231; duyuldu&#287;unda h&#305;zl&#305; enerji sal&#305;n&#305;m&#305;n&#305; kolayla&#351;t&#305;r&#305;r.
Poli-&#946;-hidroksib&#252;tirik asit (PHB) gran&#252;lleri, biyolojik olarak par&#231;alanabilen plastik &#252;retimindeki rolleri nedeniyle &#231;e&#351;itli end&#252;striyel uygulamalara sahiptir. PHB, petrol bazl&#305; plastiklere alternatif olan bir polihidroksialkanoat (PHA) t&#252;r&#252;d&#252;r. Biyouyumlu, toksik olmayan ve &#231;evrede tamamen par&#231;alanabilir olmas&#305; nedeniyle de&#287;erlidir.
Metakromatik Gran&#252;ller: Polifosfat Rezervleri
Metakromatik gran&#252;ller, di&#287;er ad&#305;yla volutin, inorganik polifosfat&#305;n h&#252;cre i&#231;i depolama birikintileridir. "Metakromatik" terimi, y&#252;ksek fosfat i&#231;erikleri nedeniyle uygulanan boyadan farkl&#305; (meta) bir renkte boyanma &#246;zelliklerine i&#351;aret eder. Bu gran&#252;ller, ilk olarak Spirillum volutans&#8217;ta g&#246;zlemlendi&#287;i i&#231;in "volutin" olarak da adland&#305;r&#305;l&#305;r. Corynebacterium gibi cinslerde yayg&#305;n olarak g&#246;r&#252;len bu gran&#252;ller, n&#252;kleik asit ve ATP sentezi i&#231;in kritik bir bile&#351;en olan fosfat i&#231;in rezervuar g&#246;revi g&#246;r&#252;r. Bu depolama stratejisi, fosfat k&#305;s&#305;tlamas&#305; d&#246;nemlerinde bakteriyel b&#252;y&#252;me ve &#252;remeyi destekler.
K&#252;k&#252;rt Glob&#252;lleri: Elementel K&#252;k&#252;rt Depolama
K&#252;k&#252;rt glob&#252;lleri, Thiobacillus gibi k&#252;k&#252;rt oksitleyici bakterilerde belirgindir. Bu inkl&#252;zyonlar, hidrojen s&#252;lf&#252;r veya tiyos&#252;lfat gibi indirgenmi&#351; k&#252;k&#252;rt bile&#351;iklerinin oksidasyonundan t&#252;retilen elementel k&#252;k&#252;rd&#252; depolar ve kolayca eri&#351;ilebilir bir enerji rezervi olarak i&#351;lev g&#246;r&#252;r. Depolanan bu k&#252;k&#252;rt, enerji talebi d&#246;nemlerinde s&#252;lfata kadar oksitlenebilir ve bakteriyel h&#252;crenin metabolizmas&#305;na katk&#305;da bulunur. Bu s&#252;re&#231;, yaln&#305;zca enerji sa&#287;lamakla kalmaz, ayn&#305; zamanda &#231;evrede k&#252;k&#252;rt d&#246;ng&#252;s&#252;nde rol oynayarak bu inkl&#252;zyonlar&#305;n ekolojik &#246;nemini g&#246;sterir.
Karboksizomlar: Karbon Fiksasyonu
Siyanobakteriler ve baz&#305; di&#287;er ototrofik prokaryotlar, ribuloz-1,5-bisfosfat karboksilaz/oksijenaz (RuBisCO) i&#231;eren protein yap&#305;l&#305; mikrokompart&#305;manlar olan karboksizomlar &#252;retir. Bu inkl&#252;zyonlar, CO_2&#8217;yi konsantre ederek ve RuBisCO verimlili&#287;ini art&#305;rarak karbon dioksit fiksasyonunu kolayla&#351;t&#305;r&#305;r; bu, d&#252;&#351;&#252;k CO_2 ortamlar&#305;nda fotosentetik organizmalar i&#231;in kritik bir adaptasyondur.
Gaz Vakuolleri: Y&#252;zme D&#252;zenlemesi
Gaz vakuolleri, sucul bakterilerde ve arkelerde bulunan, y&#252;zmeyi d&#252;zenleyen protein kapl&#305; i&#231;i bo&#351; yap&#305;lard&#305;r. Bu organizmalar su kolonundaki konumlar&#305;n&#305; ayarlayarak &#305;&#351;&#305;k ve besin maddelerine eri&#351;imlerini optimize eder. Bu adaptasyon, &#246;zellikle tabakal&#305; su ortamlar&#305;ndaki fotosentetik ve sucul bakteriler i&#231;in hayati &#246;neme sahiptir.
Magnetozomlar: Navigasyon Yard&#305;mc&#305;lar&#305; 
Magnetozomlar, demir oksitler (&#246;rne&#287;in, manyetit) veya greigit i&#231;eren zarla &#231;evrili inkl&#252;zyonlard&#305;r. Bu yap&#305;lar, Magnetospirillum magnetotactic gibi bakterilerde yayg&#305;nd&#305;r. Magnetozomlar, d&#252;nya&#8217;n&#305;n manyetik alan&#305;yla hizalanarak, bakterileri, metabolizmalar&#305; i&#231;in daha elveri&#351;li olan d&#252;&#351;&#252;k oksijenli veya anaerobik b&#246;lgelere y&#246;nlendirir. Bu manyetik navigasyon sistemi, prokaryotik h&#252;crelerin ekolojik ni&#351;lerine &#246;zg&#252; &#246;zel adaptasyonlar&#305;n&#305; &#246;rnekler.
&#214;zetle, prokaryotik inkl&#252;zyonlar, bakterilerin besinleri verimli bir &#351;ekilde depolamas&#305;n&#305;, &#231;evresel etkile&#351;imleri d&#252;zenlemesini ve metabolik s&#252;re&#231;leri optimize etmesini sa&#287;layan &#231;ok i&#351;levli yap&#305;lard&#305;r. Bu adaptasyonlar, prokaryotik ya&#351;am formlar&#305;n&#305;n dikkat &#231;ekici &#231;ok y&#246;nl&#252;l&#252;&#287;&#252;n&#252; ve dayan&#305;kl&#305;l&#305;&#287;&#305;n&#305; g&#246;sterir.

Hücre İnküzyonları

Prokaryot h&#252;creler, besin depolama, metabolik s&#252;re&#231;ler ve &#231;evresel adaptasyon a&#231;&#305;s&#305;ndan kritik i&#351;levlere sahip ...

Education

JoVE Core

Microbiology

Mikrobiyoloji

Unit

Birim

Microbial Cell Structure and Function        

Mikrobiyal Hücre Yapısı ve İşlevi

KEY TERMS AND CONCEPTS

TEMEL TERİMLER VE KAVRAMLAR

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 faster energy source because glycogen is highly branched and enzymes can access it quickly.

PHB has another important role outside the cell. It is a polyhydroxyalkanoate, or PHA, and is used to make biodegradable plastics. It is valued because it is biocompatible, non-toxic, and fully degradable in the environment.

Other inclusions store phosphate. Metachromatic granules, also called volutin, are deposits of inorganic polyphosphate. They were first observed in Spirillum volutans, and they are common in bacteria such as Corynebacterium. These granules stain a different color than the dye used because of their high phosphate content, and they provide phosphate for nucleic acids and ATP.

Sulfur globules store elemental sulfur in sulfur-oxidizing bacteria such as Thiobacillus. The sulfur comes from oxidized reduced sulfur compounds like hydrogen sulfide or thiosulfate. The stored sulfur can be oxidized further to sulfate when the cell needs energy, and this also helps sulfur move through the environment.

Some prokaryotes use inclusions for carbon fixation and movement. Cyanobacteria and other autotrophic prokaryotes make carboxysomes, which are protein-based microcompartments that contain RuBisCO. These structures concentrate CO2 and help RuBisCO work better, especially when CO2 is low. Gas vacuoles are hollow, protein-lined structures in aquatic bacteria and archaea that control buoyancy, so the cells can stay where light and nutrients are available.

Magnetosomes help bacteria navigate. These membrane-bound inclusions contain iron oxides such as magnetite or greigite. In bacteria like Magnetospirillum magnetotacticum, magnetosomes align with Earth’s magnetic field and guide cells toward low-oxygen or anaerobic zones that better fit their metabolism. Together, these inclusions show how prokaryotic cells store resources, sense their surroundings, and live successfully in many habitats.

Prokaryotic Cell Storage Inclusions

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 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

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...

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 prokaryotic cell inclusions store carbon, phosphate, and sulfur, support carbon fixation, control buoyancy, and guide bacteria with magnetosomes.

Prokaryotic Cell Storage Inclusions | JoVE K12

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BIO.4.e

Prokaryotic Cell Storage Inclusions

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