Question : In which tubulin protein is not present :-

Tubulin contains two polypeptide subunits, and dimers of these subunits string together to make long strands called protofilaments. Thirteen protofilaments then come together to form the hollow, straw-shaped filaments of microtubules.

roughly 50 kDa
To be more precise, tubulin dimers made up of alpha and beta tubulin subunits (each of mass roughly 50 kDa) form protofilaments with a periodicity of 8 nm.

Tubulin is a dimer consisting of two closely related 55-kd polypeptides, α-tubulin and β-tubulin. Like actin, both α- and β-tubulin are encoded by small families of related genes.

γ-tubulin, a conserved member of the eukaryotic tubulin superfamily specialized for microtubule nucleation is a target of cell cycle and stress signaling. Besides its microtubule nucleation role, γ-tubulin functions in nuclear and cell cycle related processes.

50 kDa
Microtubules are assembled from dimers of α- and β-tubulin. These subunits are slightly acidic with an isoelectric point between 5.2 and 5.8. Each has a molecular weight of approximately 50 kDa.

Microfilaments are fine, thread-like protein fibers, 3-6 nm in diameter. Microfilaments can also carry out cellular movements including gliding, contraction, and cytokinesis. Microtubules. Microtubules are cylindrical tubes, 20-25 nm in diameter.

A number of factors regulate the dynamics of microtubule formation however the primary determinant of whether microtubules grow or shrink is the rate of GTP hydrolysis, a factor that is both intrinsic and essential to filament assembly [3]. This results in rapid shrinking of the microtubule.

Tubulin in molecular biology can refer either to the tubulin protein superfamily of globular proteins, or one of the member proteins of that superfamily. α- and β-tubulins polymerize into microtubules, a major component of the eukaryotic cytoskeleton.

In contrast, tubulin polymers (microtubules) tend to be much bigger than actin filaments due to their cylindrical nature. Tubulin was long thought to be specific to eukaryotes. More recently, however, several prokaryotic proteins have been shown to be related to tubulin.

Immunofluorescent analysis of (4% PFA) fixed HepG2 cells using 10094-1-AP (beta Tubulin antibody) at dilution of 1:50 and Alexa Fluor 488-conjugated AffiniPure Goat Anti-Rabbit IgG (H+L). The Proteintech guarantee covers Proteintech antibodies in any species and any application, including those not listed on the datasheet.

Tubulin. Tubulin in molecular biology can refer either to the tubulin protein superfamily of globular proteins, or one of the member proteins of that superfamily. α- and β-tubulins polymerize into microtubules, a major component of the eukaryotic cytoskeleton. Microtubules function in many essential cellular processes, including mitosis.