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March 6, 2015

Homework Help: cell biology

Posted by tammy on Tuesday, August 1, 2006 at 10:19am.

Motor proteins such as as kinesin and dynein move along the cytoskeleton using the energy generataed from the hydrogen________, this phosphorylated nucleotide.

a. GDP
B. GTP
C. ATP
D. ADP

i THINK THE RIGHT ANSWER IS "C"
PLEASE CHECK


Since this is not my area of expertise, I searched Google under the key words "hydrogen ADP" to get these possible sources:

(Broken Link Removed)
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=15808509&dopt=Abstract
http://www3.interscience.wiley.com:8100/legacy/college/boyer/0471661791/structure/pfk/pfk.htm
http://www.cytochemistry.net/Cell-biology/mitochondria_1.htm

I hope this helps. Thanks for asking.


I think you are right. Read below.

Two main classes of microtubule motor proteins carry out ATP-dependent movement along microtubules (A. p. 952-953):

Kinesins are a large family of motor proteins, most of which walk along microtubules toward the plus end, away from the centrosome (MTOC).
Dyneins walk along microtubules toward the minus end (toward the centrosome).
In each case there is postulated to be a reaction cycle similar (but not identical) to that of myosin. Motility arises from conformational changes in the motor domain as ATP is bound and hydrolyzed, and products are released.

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