Supplemental Material


Supplemental Figure 4:
Distribution of ribosome occupancy values.
The percentage of each mRNA found in ribosomecontaining fractions (Fractions 614) was determined, and the values for 5701 genes are plotted.
(Also available in Portable Document Format [PDF] )



Supplemental Figure 5:
Ribosome density distributions.
Distribution of ribosome density values for the subset of 739 genes that have a peak fraction assigned to one fraction with 95% confidence level, the subset of 2128 genes with peak fraction assigned to two adjacent fractions, and for all 5701 genes.
(Also available in
Portable Document Format [PDF] )



Supplemental Figure 6:
Correlations of ribosome density with mRNA features.
Scatter plot of density values with codon bias index, codon adaptation index, mRNA abundance and mRNA halflife.
(Also available in Portable Document Format [PDF] )



Supplemental Figure 7:
Testing the effects from potential incorrect assignment of number of ribosomes in the fastmigrating fractions.
Correlation of ORF length with ribosome density when analyzing only the wellresolved fractions, when assigning extreme error margins for the number of ribosomes in fractions or when assigning ribosome density by a weighted average across the polysomal gradient.
(Also available in Portable Document Format [PDF] )



Supplemental Figure 8:
Correlation of ribosome density and ORF length within subsets of genes.
Correlation of ORF length with ribosome density for subsets of genes with a similar localization of their mRNA (membrane or mitochondria) or similar localization of the encoded protein (ribosome or mitochondria)
(Also available in Portable Document Format [PDF] )



Supplemental Figure 9: Correlation of ribosome density and ORF length in mammalian cells.
Correlation of ribosome density and ORF length observed in mouse cells
by Northern analysis (Cataldo L. Mol. Human Repro. 1999, 5 pp. 206213).
(Also available in Portable Document Format [PDF] )


Excel workbook
(24 kb)

Supplemental Table 1:
List of genes which less than 50% of their mRNAs are associated with
ribosome(s).
List of genes with ribosome occupancy values lower than 50%. For each
gene, two values are presented: percent associated with one ribosome
or more (sum of fractions 614) and percent associated with two or
more ribosomes ((sum of fractions 814). For each gene, its annotated
function in MIPS) are also presented.


Excel workbook
(32
kb)

Supplemental Table 2:
List of mRNAs predominantly associated with one ribosome.
List of genes which had a peak fraction in fractions 6 or 7. This list
was extracted from the 2128 genes data set (Containing genes with
their bootstrap 95% Confidence intervals for peak fraction assignment
containing at most two adjacent fractions). Also presented for each
gene is its annotated function in SGD,
its functional group (from MIPS), and the number of AUGs located in its 140 nts upstream to the start site.


Excel workbook
(1.4
MB)

Supplemental Table 3:
Protein synthesis estimates.
To predict relative translation
rates we simply multiply the ribosome
occupancy by the ribosome density. This
estimate assumes elongation and termination
are equal for all genes and there are no
large biases from different shape of
polysome distributions. In order to estimate
proteins synthesis rates
(proteins/sec), the relative translation
values were multiplied by the
mRNA
abundance and
divided by the time needed to translate
fragment of 100 nts (3.3 second, assuming
elongation rate is 30 nts/sec, on every
section along every mRNA ).


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Supplemental Table 4:
Number of ribosomes associated with each fraction of the sucrose gradient.
Also available in PDF format.


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Supplemental Table 5:
Summary
of searches for motifs in the untranslated
regions of the genes listed in supplemental
Tables 1 and 2.
Two different search
algorithms were used, MEME
and BioProspector,
to try and identify sequence motifs that
might be involved in translation regulation.

