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CCPEM  November 2020

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Subject:

Re: [EXTERNAL] Re: [ccpem] Bump in FSC curves

From:

Takanori Nakane <[log in to unmask]>

Reply-To:

Takanori Nakane <[log in to unmask]>

Date:

Thu, 26 Nov 2020 21:10:19 +0000

Content-Type:

text/plain

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text/plain (229 lines)

Hi,

Yes, it is OK and FSC looks fine to me.

Takanori

On 2020/11/26 20:53, Victor Banerjee wrote:
> Does it mean OK to have such bumps at the 4.7A region? and the FSC is acceptable?
> -Victor
> 
> 
> 
> 
> On Thu, Nov 26, 2020 at 2:50 PM Takanori Nakane <[log in to unmask] <mailto:[log in to unmask]>> wrote:
> 
>     Yes.
> 
>     Takanori
> 
>     On 2020/11/26 19:18, Victor Banerjee wrote:
>      >
>      > Hi,
>      > Just checking if this kind of bump in the green line is also acceptable? The map is refined and postproceed.
>      > -Victor
>      >
>      >
>      > On Thu, Nov 26, 2020 at 12:24 PM Reza Khayat <[log in to unmask] <mailto:[log in to unmask]> <mailto:[log in to unmask]
>     <mailto:[log in to unmask]>>> wrote:
>      >
>      >     Thanks!
>      >
>      >     Reza Khayat, PhD
>      >     Associate Professor
>      >     City College of New York
>      >     Department of Chemistry and Biochemistry
>      >     New York, NY 10031
>      >
>      >     ________________________________________
>      >     From: Takanori Nakane <[log in to unmask] <mailto:[log in to unmask]> <mailto:[log in to unmask]
>     <mailto:[log in to unmask]>>>
>      >     Sent: Thursday, November 26, 2020 1:07 PM
>      >     To: Reza Khayat; [log in to unmask] <mailto:[log in to unmask]> <mailto:[log in to unmask] <mailto:[log in to unmask]>>
>      >     Subject: [EXTERNAL] Re: [ccpem] Bump in FSC curves
>      >
>      >     Hi,
>      >
>      >     Because some CTF parameters (e.g. Cs) is defined assuming the right pixel size.
>      >     See
>      >
>     https://urldefense.proofpoint.com/v2/url?u=https-3A__www3.mrc-2Dlmb.cam.ac.uk_relion_index.php_Pixel-5Fsize-5Fissues&d=DwIG-g&c=4NmamNZG3KTnUCoC6InoLJ6KV1tbVKrkZXHRwtIMGmo&r=1DzJFW0v6TgEhkW1gy_-ke-RbtvS1fzEbD5_hcb9Up0&m=Jyfz-YpMjUtIbokDFmZ3UMnIE5o6K4XUKZ0pYSn6l3Y&s=jQuIMopzoPDSd2-mfw-WIL_dlx2LXt4pagYeHGARyUw&e=
>     <https://urldefense.proofpoint.com/v2/url?u=https-3A__www3.mrc-2Dlmb.cam.ac.uk_relion_index.php_Pixel-5Fsize-5Fissues&d=DwIG-g&c=4NmamNZG3KTnUCoC6InoLJ6KV1tbVKrkZXHRwtIMGmo&r=1DzJFW0v6TgEhkW1gy_-ke-RbtvS1fzEbD5_hcb9Up0&m=Jyfz-YpMjUtIbokDFmZ3UMnIE5o6K4XUKZ0pYSn6l3Y&s=jQuIMopzoPDSd2-mfw-WIL_dlx2LXt4pagYeHGARyUw&e=>
>      >   
>       <https://urldefense.proofpoint.com/v2/url?u=https-3A__www3.mrc-2Dlmb.cam.ac.uk_relion_index.php_Pixel-5Fsize-5Fissues&d=DwIG-g&c=4NmamNZG3KTnUCoC6InoLJ6KV1tbVKrkZXHRwtIMGmo&r=1DzJFW0v6TgEhkW1gy_-ke-RbtvS1fzEbD5_hcb9Up0&m=Jyfz-YpMjUtIbokDFmZ3UMnIE5o6K4XUKZ0pYSn6l3Y&s=jQuIMopzoPDSd2-mfw-WIL_dlx2LXt4pagYeHGARyUw&e= <https://urldefense.proofpoint.com/v2/url?u=https-3A__www3.mrc-2Dlmb.cam.ac.uk_relion_index.php_Pixel-5Fsize-5Fissues&d=DwIG-g&c=4NmamNZG3KTnUCoC6InoLJ6KV1tbVKrkZXHRwtIMGmo&r=1DzJFW0v6TgEhkW1gy_-ke-RbtvS1fzEbD5_hcb9Up0&m=Jyfz-YpMjUtIbokDFmZ3UMnIE5o6K4XUKZ0pYSn6l3Y&s=jQuIMopzoPDSd2-mfw-WIL_dlx2LXt4pagYeHGARyUw&e=>>
>      >     .
>      >
>      >     Takanori
>      >
>      >     On 2020/11/26 18:04, Reza Khayat wrote:
>      >      > Why would an incorrect pixel size cause a bump in the FSC? The wrong pixel size will move the bump (left or right), but I just don't see
>     why it
>      >     would create a bump. The pixel size is something we tell the computer to put the map on the laboratory point of reference. Perhaps I'm missing
>      >     something important....
>      >      >
>      >      > Reza Khayat, PhD
>      >      > Associate Professor
>      >      > City College of New York
>      >      > Department of Chemistry and Biochemistry
>      >      > New York, NY 10031
>      >      >
>      >      > ________________________________________
>      >      > From: Collaborative Computational Project in Electron cryo-Microscopy <[log in to unmask] <mailto:[log in to unmask]>
>     <mailto:[log in to unmask] <mailto:[log in to unmask]>>> on behalf of Marino
>      >     Jacopo (PSI) <[log in to unmask] <mailto:[log in to unmask]> <mailto:[log in to unmask] <mailto:[log in to unmask]>>>
>      >      > Sent: Thursday, November 26, 2020 10:27 AM
>      >      > To: [log in to unmask] <mailto:[log in to unmask]> <mailto:[log in to unmask] <mailto:[log in to unmask]>>
>      >      > Subject: [EXTERNAL] Re: [ccpem] Bump in FSC curves
>      >      >
>      >      > I think it was already discussed somewhere it might be due to the detergent micelle. But I think Marta has a stronger feeling the
>     initial pixel
>      >     size was off.
>      >      >
>      >      >
>      >      > -----Original Message-----
>      >      > From: Collaborative Computational Project in Electron cryo-Microscopy <[log in to unmask] <mailto:[log in to unmask]>
>     <mailto:[log in to unmask] <mailto:[log in to unmask]>>> On Behalf Of Basil
>      >     Greber
>      >      > Sent: Thursday, 26 November 2020 16:25
>      >      > To: [log in to unmask] <mailto:[log in to unmask]> <mailto:[log in to unmask] <mailto:[log in to unmask]>>
>      >      > Subject: Re: [ccpem] Bump in FSC curves
>      >      >
>      >      > Hi Marta,
>      >      >
>      >      > This bump (the valley, not the hill) is common and not an indication of processing issues. It may arise from the reduced scattering power of
>      >     proteins in this frequency range.
>      >      >
>      >      > Best regards,
>      >      >
>      >      > Basil
>      >      >
>      >      >
>      >      >> Am 26.11.2020 um 15:16 schrieb Marta Sawicka <[log in to unmask] <mailto:[log in to unmask]> <mailto:[log in to unmask]
>     <mailto:[log in to unmask]>>>:
>      >      >>
>      >      >> Dear cryo-EM folks,
>      >      >>
>      >      >> I have observed a strange bump in FSC curves, which always occurs in a region between 5.5-4.5 A. I see the same pattern regardless of a
>      >     protein I work with and data processing strategy. Having read what has been already discussed in relation to spikes in the FSC curves I
>     suspect a
>      >     significant error in the pixel size to cause this bump. Also, having compared maps of the same protein coming from different microscopes, I
>     needed
>      >     to rescale the pixel size by approximately 5% to get a correct fit. Based on the RELION wiki entry on the pixel size issues, I have redone
>      >     CtfRefine with estimation of the 4th order aberrations followed by another run to recalculate per-particle defocus. As far as I understand this
>      >     should make things consistent with a wrong pixel size and after I feed a correct “absolute” pixel size in PostProcessing, I should get FSC
>     curves
>      >     without the bump. However, this is not the case and the FSCs look pretty much exactly the same. Is there something fundamental that I am
>     missing
>      >     here? I would appreciate any ideas/suggestions.
>      >      >>
>      >      >> Many thanks,
>      >      >> Marta
>      >      >>
>      >      >> ########################################################################
>      >      >>
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>      >      >> <FSC.pdf>
>      >      >
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