Dictionary » A » Actin



(Science: cell biology) a filamentous proteins (42 kD) involved in muscle contraction in both smooth and striated muscle and also serves as an important structural molecule for the cytoskeleton of many eukaryotic cells.

It is the main constituent of the thin filaments of muscle fibres. The filaments (known also as filamentous or f-actin) can be dissociated into their globular subunits; each subunit is composed of a single polypeptide 375 amino acids long. this is known as globular or g-actin. in conjunction with myosin, actin is responsible for the contraction and relaxation of muscle.

See: myosin. One of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form.A protein found in the muscles of organisms that is initiated by atp to allow contraction of a [[muscle.

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myosin and actin constituent amino acids?

Do we know what the constituent amino acids of myosin and actin are, and the ratios of these amino acids in muscle tissue? Thank you.

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by mattw
Sat Aug 24, 2013 7:58 pm
Forum: Human Biology
Topic: myosin and actin constituent amino acids?
Replies: 1
Views: 717

Problem with the normalization of PCR Ct values

in my case when I have a gene of interest and the standard gene (usually actin) I divide the calculated conc. in fmol of the gene of interest by the calculated conc. of actin. about the ct values, the higher the value, less copies are there, if you make a standard ...

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by bravebeaker
Wed May 01, 2013 1:12 am
Forum: Molecular Biology
Topic: Problem with the normalization of PCR Ct values
Replies: 5
Views: 4257

RT PCR contamination.

... that I have tried that have improved this situation. My supervisor suggest maybe there is contamination of the amplicon I am testing. We use b-actin as a control for a lot of experiments so it is plausible but I find it difficult to believe when in my endpoint PCR I got the negative for that ...

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by georgewiggins
Thu Sep 06, 2012 9:49 pm
Forum: Molecular Biology
Topic: RT PCR contamination.
Replies: 2
Views: 4160

Idea to determine order of assembly of spliceosome

... that you could have false results because of one-case-only binding/non-binding. To explain - imagine you will design probes for intron in gene for actin. Generaly there are five proteins in spliceosome, let's call them S pliceosome P rotein1 - 5, but in actin is not present SP3, but are present ...

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by JackBean
Wed May 30, 2012 8:06 am
Forum: Molecular Biology
Topic: Idea to determine order of assembly of spliceosome
Replies: 15
Views: 7817

Re: Please identify this structure. THX.

BTW, It doesn't co-localize with F-actin and microtubes. It seems look like some kind of vesicles. But these vesicles don't like endosomes, golgi or ER, too.

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by fangpaul74
Fri Feb 24, 2012 3:50 pm
Forum: Cell Biology
Topic: Please identify this structure. THX.
Replies: 3
Views: 1906
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