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Math Lab
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Math Lab Rooms located in the Main Library in rooms 300X and 300Y
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Located at the first floor of the LSU Main Library.
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Can I request materials of interest before I arrive?
Yes, you have the option to place requests to view materials in our reading room after you have set up an online account. First, create a Special Collections Request System account (https://specialcollections.lib.lsu.edu/logon) . We highly suggest that you make a request in advance because some materials must be retrieved from an off-site storage facility (requiring 48 business hours of advanced notice) and in-house materials can only be retrieved by staff from our closed stacks. Visit the librarys public catalog. (https://lsu.ent.sirsi.net/client/en_US/lsu) TIP: In the first drop down box that defaults to Everything, simply select Special Collections and then conduct your search. Click on the Request Item link in the catalog record to place your request. Yes, you have the option to place requests to view materials in our reading room after you have set up an online account. First, create a Special Collections Request System account (https://specialcollections.lib.lsu.edu/logon) . We highly suggest that you make a request in advance because some materials must be retrieved from an off-site storage facility (requiring 48 business hours of advanced notice) and in-house materials can only be retrieved by staff from our closed stacks. Visit the librarys public catalog. (https://lsu.ent.sirsi.net/client/en_US/lsu) TIP: In the first drop down box that defaults to Everything, simply select Special Collections and then conduct your search. Click on the Request Item link in the catalog record to place your request. Answered by: Kelly Larson

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2058653
The C-terminal actin-binding domain of talin forms an asymmetric catch bond with F-actin
Focal adhesions (FAs) are large, integrin-based protein complexes that link cells to the extracellular matrix (ECM). FAs form only when and where they are necessary to transmit force between the cellular cytoskeleton and the ECM, but how this occurs remains poorly understood. Talin is a 270-kDa adaptor protein that links integrins to filamentous (F)-actin and recruits additional components during FA assembly in a force-dependent manner. Cell biological and developmental data demonstrate that the third and C-terminal F-actin–binding site (ABS3) of talin is required for normal FA formation. However, purified ABS3 binds F-actin only weakly in solution. We used a single molecule optical trap assay to examine how and whether ABS3 binds F-actin under physiologically relevant mechanical loads. We find that ABS3 forms a catch bond with F-actin when force is applied toward the pointed end of the actin filament, with binding lifetimes >100-fold longer than when force is applied toward the barbed end. Long-lived bonds to F-actin under load require the ABS3 C-terminal dimerization domain, whose cleavage has been reported to regulate FA turnover. Our results support a mechanism in which talin ABS3 preferentially binds to and orients actin filaments with barbed ends facing the cell periphery, thus nucleating long-range order in the actin cytoskeleton. We suggest that talin ABS3 may function as a molecular AND gate that allows FA growth only when sufficient integrin density, F-actin polarization, and mechanical tension are simultaneously present.